CN118125889B - Water-saving and water-retaining organic fertilizer and preparation method thereof - Google Patents
Water-saving and water-retaining organic fertilizer and preparation method thereof Download PDFInfo
- Publication number
- CN118125889B CN118125889B CN202410557832.7A CN202410557832A CN118125889B CN 118125889 B CN118125889 B CN 118125889B CN 202410557832 A CN202410557832 A CN 202410557832A CN 118125889 B CN118125889 B CN 118125889B
- Authority
- CN
- China
- Prior art keywords
- water
- weight
- parts
- fermentation
- organic fertilizer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 239000003895 organic fertilizer Substances 0.000 title claims abstract description 69
- 238000002360 preparation method Methods 0.000 title claims abstract description 10
- 238000000855 fermentation Methods 0.000 claims abstract description 84
- 230000004151 fermentation Effects 0.000 claims abstract description 77
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 66
- 239000000203 mixture Substances 0.000 claims abstract description 64
- 229920002472 Starch Polymers 0.000 claims abstract description 53
- 239000008107 starch Substances 0.000 claims abstract description 53
- 235000019698 starch Nutrition 0.000 claims abstract description 45
- 235000002595 Solanum tuberosum Nutrition 0.000 claims abstract description 31
- 244000061456 Solanum tuberosum Species 0.000 claims abstract description 31
- 239000001341 hydroxy propyl starch Substances 0.000 claims abstract description 31
- 235000013828 hydroxypropyl starch Nutrition 0.000 claims abstract description 31
- 238000010564 aerobic fermentation Methods 0.000 claims abstract description 22
- VAPQAGMSICPBKJ-UHFFFAOYSA-N 2-nitroacridine Chemical compound C1=CC=CC2=CC3=CC([N+](=O)[O-])=CC=C3N=C21 VAPQAGMSICPBKJ-UHFFFAOYSA-N 0.000 claims abstract description 18
- WCUXLLCKKVVCTQ-UHFFFAOYSA-M Potassium chloride Chemical compound [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 claims description 24
- 238000002156 mixing Methods 0.000 claims description 22
- 241000196324 Embryophyta Species 0.000 claims description 20
- 239000010902 straw Substances 0.000 claims description 18
- HDTRYLNUVZCQOY-UHFFFAOYSA-N α-D-glucopyranosyl-α-D-glucopyranoside Natural products OC1C(O)C(O)C(CO)OC1OC1C(O)C(O)C(O)C(CO)O1 HDTRYLNUVZCQOY-UHFFFAOYSA-N 0.000 claims description 13
- HDTRYLNUVZCQOY-WSWWMNSNSA-N Trehalose Natural products O[C@@H]1[C@@H](O)[C@@H](O)[C@@H](CO)O[C@@H]1O[C@@H]1[C@H](O)[C@@H](O)[C@@H](O)[C@@H](CO)O1 HDTRYLNUVZCQOY-WSWWMNSNSA-N 0.000 claims description 13
- HDTRYLNUVZCQOY-LIZSDCNHSA-N alpha,alpha-trehalose Chemical compound O[C@@H]1[C@@H](O)[C@H](O)[C@@H](CO)O[C@@H]1O[C@@H]1[C@H](O)[C@@H](O)[C@H](O)[C@@H](CO)O1 HDTRYLNUVZCQOY-LIZSDCNHSA-N 0.000 claims description 13
- 230000001580 bacterial effect Effects 0.000 claims description 13
- 238000000034 method Methods 0.000 claims description 13
- QJZYHAIUNVAGQP-UHFFFAOYSA-N 3-nitrobicyclo[2.2.1]hept-5-ene-2,3-dicarboxylic acid Chemical compound C1C2C=CC1C(C(=O)O)C2(C(O)=O)[N+]([O-])=O QJZYHAIUNVAGQP-UHFFFAOYSA-N 0.000 claims description 12
- 241001494479 Pecora Species 0.000 claims description 12
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims description 12
- 239000001506 calcium phosphate Substances 0.000 claims description 12
- 229910000389 calcium phosphate Inorganic materials 0.000 claims description 12
- 235000011010 calcium phosphates Nutrition 0.000 claims description 12
- 239000004202 carbamide Substances 0.000 claims description 12
- 210000003608 fece Anatomy 0.000 claims description 12
- 238000004108 freeze drying Methods 0.000 claims description 12
- 239000004021 humic acid Substances 0.000 claims description 12
- 239000007788 liquid Substances 0.000 claims description 12
- 239000010871 livestock manure Substances 0.000 claims description 12
- 239000001103 potassium chloride Substances 0.000 claims description 12
- 235000011164 potassium chloride Nutrition 0.000 claims description 12
- QORWJWZARLRLPR-UHFFFAOYSA-H tricalcium bis(phosphate) Chemical compound [Ca+2].[Ca+2].[Ca+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O QORWJWZARLRLPR-UHFFFAOYSA-H 0.000 claims description 12
- 230000003203 everyday effect Effects 0.000 claims 2
- 239000003795 chemical substances by application Substances 0.000 abstract description 49
- 239000003337 fertilizer Substances 0.000 abstract description 21
- 239000011347 resin Substances 0.000 abstract description 19
- 229920005989 resin Polymers 0.000 abstract description 19
- 229920001059 synthetic polymer Polymers 0.000 abstract description 19
- 229920005615 natural polymer Polymers 0.000 abstract description 15
- 230000000694 effects Effects 0.000 abstract description 11
- 238000009264 composting Methods 0.000 abstract description 2
- 238000010521 absorption reaction Methods 0.000 description 16
- 241000894006 Bacteria Species 0.000 description 15
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 14
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 14
- 229910052698 phosphorus Inorganic materials 0.000 description 14
- 239000011574 phosphorus Substances 0.000 description 14
- 239000011591 potassium Substances 0.000 description 14
- 229910052700 potassium Inorganic materials 0.000 description 14
- 230000014759 maintenance of location Effects 0.000 description 10
- 206010016807 Fluid retention Diseases 0.000 description 9
- 230000000052 comparative effect Effects 0.000 description 9
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical group [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 5
- 239000000017 hydrogel Substances 0.000 description 5
- 229920002643 polyglutamic acid Polymers 0.000 description 5
- 229910052799 carbon Inorganic materials 0.000 description 4
- 239000001913 cellulose Substances 0.000 description 4
- 229920002678 cellulose Polymers 0.000 description 4
- 235000010980 cellulose Nutrition 0.000 description 4
- 230000035699 permeability Effects 0.000 description 4
- 108700022290 poly(gamma-glutamic acid) Proteins 0.000 description 4
- IXPNQXFRVYWDDI-UHFFFAOYSA-N 1-methyl-2,4-dioxo-1,3-diazinane-5-carboximidamide Chemical compound CN1CC(C(N)=N)C(=O)NC1=O IXPNQXFRVYWDDI-UHFFFAOYSA-N 0.000 description 3
- 241000220479 Acacia Species 0.000 description 3
- 229920001817 Agar Polymers 0.000 description 3
- 229920001661 Chitosan Polymers 0.000 description 3
- 229920002752 Konjac Polymers 0.000 description 3
- 235000010643 Leucaena leucocephala Nutrition 0.000 description 3
- DPXJVFZANSGRMM-UHFFFAOYSA-N acetic acid;2,3,4,5,6-pentahydroxyhexanal;sodium Chemical compound [Na].CC(O)=O.OCC(O)C(O)C(O)C(O)C=O DPXJVFZANSGRMM-UHFFFAOYSA-N 0.000 description 3
- 239000004480 active ingredient Substances 0.000 description 3
- 239000008272 agar Substances 0.000 description 3
- 235000010419 agar Nutrition 0.000 description 3
- 239000001768 carboxy methyl cellulose Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000000813 microbial effect Effects 0.000 description 3
- 238000013508 migration Methods 0.000 description 3
- 230000005012 migration Effects 0.000 description 3
- 239000011734 sodium Substances 0.000 description 3
- 229910052708 sodium Inorganic materials 0.000 description 3
- 235000010413 sodium alginate Nutrition 0.000 description 3
- 239000000661 sodium alginate Substances 0.000 description 3
- 229940005550 sodium alginate Drugs 0.000 description 3
- 235000019812 sodium carboxymethyl cellulose Nutrition 0.000 description 3
- 229920001027 sodium carboxymethylcellulose Polymers 0.000 description 3
- 239000002689 soil Substances 0.000 description 3
- 230000008719 thickening Effects 0.000 description 3
- 238000005303 weighing Methods 0.000 description 3
- 239000000230 xanthan gum Substances 0.000 description 3
- 235000010493 xanthan gum Nutrition 0.000 description 3
- 229920001285 xanthan gum Polymers 0.000 description 3
- 229940082509 xanthan gum Drugs 0.000 description 3
- NLHHRLWOUZZQLW-UHFFFAOYSA-N Acrylonitrile Chemical compound C=CC#N NLHHRLWOUZZQLW-UHFFFAOYSA-N 0.000 description 2
- 239000002250 absorbent Substances 0.000 description 2
- 230000002745 absorbent Effects 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- WPKYZIPODULRBM-UHFFFAOYSA-N azane;prop-2-enoic acid Chemical compound N.OC(=O)C=C WPKYZIPODULRBM-UHFFFAOYSA-N 0.000 description 2
- 239000008367 deionised water Substances 0.000 description 2
- 229910021641 deionized water Inorganic materials 0.000 description 2
- 230000029087 digestion Effects 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 235000010855 food raising agent Nutrition 0.000 description 2
- 239000000499 gel Substances 0.000 description 2
- 239000000252 konjac Substances 0.000 description 2
- 235000010485 konjac Nutrition 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 230000002503 metabolic effect Effects 0.000 description 2
- 235000015097 nutrients Nutrition 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229920002401 polyacrylamide Polymers 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- LUEWUZLMQUOBSB-FSKGGBMCSA-N (2s,3s,4s,5s,6r)-2-[(2r,3s,4r,5r,6s)-6-[(2r,3s,4r,5s,6s)-4,5-dihydroxy-2-(hydroxymethyl)-6-[(2r,4r,5s,6r)-4,5,6-trihydroxy-2-(hydroxymethyl)oxan-3-yl]oxyoxan-3-yl]oxy-4,5-dihydroxy-2-(hydroxymethyl)oxan-3-yl]oxy-6-(hydroxymethyl)oxane-3,4,5-triol Chemical compound O[C@H]1[C@@H](O)[C@H](O)[C@@H](CO)O[C@H]1O[C@@H]1[C@@H](CO)O[C@@H](O[C@@H]2[C@H](O[C@@H](OC3[C@H](O[C@@H](O)[C@@H](O)[C@H]3O)CO)[C@@H](O)[C@H]2O)CO)[C@H](O)[C@H]1O LUEWUZLMQUOBSB-FSKGGBMCSA-N 0.000 description 1
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical compound NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 description 1
- 244000247812 Amorphophallus rivieri Species 0.000 description 1
- 235000001206 Amorphophallus rivieri Nutrition 0.000 description 1
- 239000002028 Biomass Substances 0.000 description 1
- 102000004190 Enzymes Human genes 0.000 description 1
- 108090000790 Enzymes Proteins 0.000 description 1
- 229920002581 Glucomannan Polymers 0.000 description 1
- 235000010443 alginic acid Nutrition 0.000 description 1
- 239000000783 alginic acid Substances 0.000 description 1
- 229920000615 alginic acid Polymers 0.000 description 1
- 229960001126 alginic acid Drugs 0.000 description 1
- 150000004781 alginic acids Chemical class 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000003610 charcoal Substances 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 230000000593 degrading effect Effects 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 229940079919 digestives enzyme preparation Drugs 0.000 description 1
- 229940088598 enzyme Drugs 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 125000000524 functional group Chemical group 0.000 description 1
- 229940046240 glucomannan Drugs 0.000 description 1
- XEMZLVDIUVCKGL-UHFFFAOYSA-N hydrogen peroxide;sulfuric acid Chemical compound OO.OS(O)(=O)=O XEMZLVDIUVCKGL-UHFFFAOYSA-N 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 235000019823 konjac gum Nutrition 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 150000002772 monosaccharides Chemical class 0.000 description 1
- 150000007524 organic acids Chemical class 0.000 description 1
- 235000005985 organic acids Nutrition 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 238000005325 percolation Methods 0.000 description 1
- 230000008635 plant growth Effects 0.000 description 1
- 229920000747 poly(lactic acid) Polymers 0.000 description 1
- 229920001495 poly(sodium acrylate) polymer Polymers 0.000 description 1
- 229920000058 polyacrylate Polymers 0.000 description 1
- 239000004626 polylactic acid Substances 0.000 description 1
- -1 potassium tetraphenylborate Chemical compound 0.000 description 1
- 125000002924 primary amino group Chemical group [H]N([H])* 0.000 description 1
- 239000003223 protective agent Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 235000015424 sodium Nutrition 0.000 description 1
- NNMHYFLPFNGQFZ-UHFFFAOYSA-M sodium polyacrylate Chemical compound [Na+].[O-]C(=O)C=C NNMHYFLPFNGQFZ-UHFFFAOYSA-M 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
- 235000013311 vegetables Nutrition 0.000 description 1
Abstract
The invention belongs to the field of fertilizers, and particularly relates to a water-saving and water-retaining organic fertilizer and a preparation method thereof; according to the invention, from the composition of the organic fertilizer, natural polymer water-retaining agent potato hydroxypropyl starch is screened out, a secondary fermentation process, namely short-time aerobic combined long-time anaerobic fermentation is adopted, only starch is added during the aerobic fermentation, potato hydroxypropyl starch is added during the anaerobic fermentation, different degradable synthetic polymer water-retaining resins are further added into a fermentation product after the fermentation is finished, starch grafted potassium acrylate matched with the organic fertilizer is screened out, the adding time of different types of water-retaining agents is researched, the composting fermentation of the organic fertilizer is not influenced, and meanwhile, the organic fertilizer has the effects of water saving and water retaining.
Description
Technical Field
The invention belongs to the field of fertilizers, and particularly relates to a water-saving and water-retaining organic fertilizer and a preparation method thereof.
Background
At present, organic fertilizers in China have been greatly developed, and the organic fertilizers can provide a large amount of nutrients for plant growth, but for arid and semiarid water-deficient areas, the organic fertilizers which can provide nutrients for crops, can preserve water and soil moisture and prolong drought resistance of crops are needed.
The water-retaining agent is a high molecular resin capable of absorbing water and expanding, contains various hydrophilic groups such as carboxyl and amino, and the functional groups form a three-dimensional network structure through moderate crosslinking with macromolecular carbon chains, has super water absorption capacity, can absorb and release water repeatedly, can be used by plants for most of water, and has the functions of regulating water, saving water and improving soil structure.
The degradable water-retaining resin is taken as an environment-friendly material, and in recent years, the development of the degradable water-retaining resin matched with the fertilizer composition has become a research hotspot in the field of fertilizers. The super absorbent resin which has been researched in the fertilizer field at present has better degradability such as starch, cellulose, alginic acid, polylactic acid and the like.
Through searching, there are many reports on adding water-retention agents such as high-water-retention resin in the fertilizer field, and CN102432397A discloses an agricultural water-retention fertilizer with a slow release effect, which comprises degradable water-retention agent starch grafted acrylate and the like; CN 116947572A discloses a water-absorbing and water-retaining microbial compound bacterial fertilizer for saline-alkali soil and a preparation method thereof, comprising a water-retaining agent which is not easy to degrade, such as acrylic acid, acrylamide and the like; CN 117447267A discloses a preparation method and application of a water-retaining fertilizer-retaining biochar-based slow release fertilizer, which comprises a degradable polyacrylamide grafted biomass charcoal water-retaining agent; CN 115784804A discloses a high water-absorbing and water-retaining organic fertilizer and a special vegetable fertilizer, which comprise a cross-linked sodium polyacrylate water-retaining agent which is not easy to degrade; CN 115353888B discloses a salinized farmland functional water-retaining agent, a preparation method and application thereof, and the functional water-retaining agent comprises a polyacrylamide water-retaining agent which is not easy to degrade.
It can be seen that although the existing fertilizer is added with the degradable or non-degradable water-retaining agent, the existing fertilizer is generally prepared by simply mixing the water-retaining agent with the fertilizer, and the water-retaining agent matched with the organic fertilizer composition is not screened according to the special composition of the organic fertilizer. The organic fertilizer needs to be fermented, a microbial starter exists, the microbial fermentation itself and metabolic products such as fermentation enzyme production can influence the structure and stability of the water-retaining agent, so that the water-retaining effect of the water-retaining agent is influenced, and meanwhile, when the organic fertilizer is fermented, the type and the adding timing of the water-retaining agent have great influence on the fermentation effect of the organic fertilizer because the micro fermentation needs proper fermentation conditions such as temperature, humidity and oxygen amount; in addition, the fermentation time of the organic fertilizer is generally long, active ingredients such as total phosphorus, total potassium and the like can be lost along with water during fermentation under the condition of high fermentation humidity, and the proper water-retaining agent is selected, so that the fermentation is not influenced while the loss of the active ingredients such as the total phosphorus, the total potassium and the like is inhibited, the water-saving and water-retaining effects are achieved, and no related report and research are available in the prior art.
Disclosure of Invention
The invention aims to provide a preparation method of a water-saving and water-retaining organic fertilizer, which is characterized in that the composition of the organic fertilizer is used for screening a degradable natural polymer water-retaining agent and a synthetic polymer water-retaining agent which are matched with the organic fertilizer, namely synthetic polymer water-retaining resin, and the addition time of different water-retaining agents is researched, so that the loss of active ingredients such as total phosphorus, total potassium and the like is inhibited during fermentation, the fermentation is not influenced, and the organic fertilizer has better water-saving and water-retaining effects.
The invention provides a preparation method of a water-saving and water-retaining organic fertilizer, which comprises the following steps:
1) Mixing: taking 50-100 parts by weight of cow and sheep manure organic matters, 15-50 parts by weight of crushed plant straws, 15-25 parts by weight of humic acid, 0.5-3 parts by weight of brown sugar, 8-20 parts by weight of starch, 1-5 parts by weight of urea, 2-7 parts by weight of calcium phosphate and 0.5-4 parts by weight of potassium chloride, and uniformly mixing with water to obtain a mixture, wherein the mixture C/N=20:1-35:1 is controlled, and the water content of the mixture is 45-60%;
2) Secondary fermentation: adding EM bacterial liquid accounting for 1-2.5% of the mass of the mixture, performing aerobic fermentation at 30-40 ℃ for 1-2 days, turning up and down once a day, adding 1-7 parts by weight of potato hydroxypropyl starch which is a degradable natural high molecular water-retaining agent, and performing pile fermentation for 15-25 days;
3) After fermentation, adding 3-10 parts by weight of degradable synthetic polymer water-retaining resin-starch grafted potassium acrylate and 2-5 parts by weight of trehalose into the fermentation product, uniformly mixing, and freeze-drying and crushing to obtain the water-saving water-retaining organic fertilizer.
Further, in the step 1), preferably 50 parts by weight of cow and sheep manure organic matters, 15 parts by weight of crushed plant straws, 15 parts by weight of humic acid, 0.5 part by weight of brown sugar, 8 parts by weight of starch, 1 part by weight of urea, 2 parts by weight of calcium phosphate and 0.5 part by weight of potassium chloride are taken; more preferably, 100 parts of cow and sheep manure organic matters, 50 parts of crushed plant straws, 25 parts of humic acid, 3 parts of brown sugar, 20 parts of starch, 5 parts of urea, 7 parts of calcium phosphate and 4 parts of potassium chloride are taken; 75 parts of cow and sheep manure organic matter, 25 parts of crushed plant straw, 25 parts of humic acid, 1 part of brown sugar, 10 parts of starch, 2 parts of urea, 4 parts of calcium phosphate and 1 part of potassium chloride are optimally selected.
Further, in step 1), the water content of the mixture C/n=20:1 is preferably controlled to be 45%, more preferably the water content of the mixture C/n=35:1 is controlled to be 60%, most preferably the water content of the mixture C/n=30:1 is controlled to be 55%.
Further, in the step 2), preferably, adding an EM bacterial solution with the mass of 2.5% of the mixture, carrying out aerobic fermentation at 40 ℃ for 1 day, turning up and down once a day, adding 7 parts by weight of potato hydroxypropyl starch which is a degradable natural high molecular water-retaining agent, and carrying out pile fermentation for 15 days; more preferably, adding EM bacterial liquid accounting for 1% of the mass of the mixture, carrying out aerobic fermentation at 30 ℃ for 2 days, turning up and down once a day, adding 1 part by weight of potato hydroxypropyl starch which is a degradable natural high molecular water-retaining agent, and carrying out pile fermentation for 7 days; most preferably, the EM bacterial liquid with the mass of 1.5% of the mixture is added, the mixture is subjected to aerobic fermentation at 35 ℃ for 1.5 days, the mixture is turned up and down once a day, 2 parts by weight of potato hydroxypropyl starch which is a degradable natural high molecular water-retaining agent is added, and the pile fermentation is carried out for 20 days.
After the fermentation is optimized in the step 3), adding 3 parts by weight of degradable synthetic polymer water-retaining resin-starch grafted potassium acrylate and 2 parts by weight of trehalose into the fermentation product, uniformly mixing, and freeze-drying and crushing to obtain the water-saving water-retaining organic fertilizer; more preferably, after the fermentation in the step 3) is finished, 10 parts by weight of degradable synthetic polymer water-retaining resin-starch grafted potassium acrylate and 5 parts by weight of trehalose are added into the fermentation product, and the mixture is uniformly mixed and then subjected to freeze-drying and crushing to obtain the water-saving water-retaining organic fertilizer; and most preferably, after the fermentation in the step 3) is finished, adding 5 parts by weight of degradable synthetic polymer water-retaining resin-starch grafted potassium acrylate and 3 parts by weight of trehalose into the fermentation product, uniformly mixing, and then carrying out freeze-drying and crushing to obtain the water-saving water-retaining organic fertilizer.
In one aspect, the invention provides the water-saving and water-retaining organic fertilizer prepared by any one of the methods.
Compared with the prior art, the invention has the beneficial effects that at least:
(1) The invention starts from the organic fertilizer composition, and selects natural polymer water-retaining agent potato hydroxypropyl starch from natural polymer water-retaining agent chitosan, sodium alginate, sodium carboxymethyl cellulose, konjak gum, agar, acacia, xanthan gum, potato hydroxypropyl starch and sodium carboxymethyl starch, which not only can increase the content of EM bacteria, but also can inhibit the migration of moisture during long-time fermentation of the organic fertilizer due to the characteristics of thickening, film forming and the like of the potato hydroxypropyl starch, thereby reducing the percolation loss of total phosphorus and total potassium along with the moisture during fermentation.
(2) The organic fertilizer adopts a secondary fermentation process, aerobic short-time fermentation is firstly carried out, natural polymer water-retaining agent is not added during fermentation, only starch is added, and the starch has weak water absorption and viscosity and is also a carbon source of EM bacteria, and the aerobic fermentation time is short, so that the loss of total phosphorus and total potassium can be relieved by adding the starch in the short-time aerobic fermentation stage, and meanwhile, the rapid increment of the EM bacteria during the aerobic fermentation is not influenced; during anaerobic fermentation, potato hydroxypropyl starch is added, and the tightness of anaerobic fermentation can be improved due to the moldability of potato hydroxypropyl starch.
(3) The invention adds a proper amount of crushed plant straw into the organic fertilizer, the crushed plant straw is rich in water absorbing and retaining substances such as fiber and the like, and the crushed plant straw can improve the air permeability of the whole organic fertilizer and is convenient for fermentation.
(4) Because natural polymer water-retaining agent is unstable and easy to degrade, the degradable synthetic polymer water-retaining resin can be further prepared by adding different degradable synthetic polymer water-retaining agents into fermentation products after fermentation is finished, the water absorption rate and water-retaining capacity of the organic fertilizer are explored, and the starch grafted potassium acrylate polymer water-retaining resin matched with the organic fertilizer is selected, so that the water-retaining resin has better water absorption rate and better water-retaining capacity.
(5) According to the invention, the degradable natural polymer water-retaining agent and the degradable synthetic polymer water-retaining agent are combined, the degradable natural polymer water-retaining agent is added in the anaerobic fermentation stage, and the degradable synthetic polymer water-retaining agent is added after fermentation is finished, so that the composting fermentation of the organic fertilizer is not affected, and meanwhile, the effects of water saving and water retaining are achieved through different adding moments of the water-retaining agent.
Drawings
FIG. 1 is the effect of example 2 on the water absorption capacity of organic fertilizer by degrading different synthetic polymer water-retaining resins.
FIG. 2 is a graph showing the effect of the degradable different synthetic polymeric water retention resins of example 2 on the water retention capacity of organic fertilizers.
Detailed Description
Specific embodiments of the present invention are described below with reference to the accompanying drawings. The experimental methods used in the implementation examples are all conventional methods unless otherwise specified; materials, reagents and the like used, unless otherwise indicated, are all commercially available.
And (3) determining total phosphorus, namely preparing digestion liquid by adopting a sulfuric acid-hydrogen peroxide digestion method of NY525-2012, and determining by utilizing a spectrophotometer.
Determination of total Potassium: the weight method of GB/T17767.3-2010 potassium tetraphenylborate is adopted.
Measurement of viable cell count: the number of viable bacteria in the bio-organic fertilizer was determined with reference to CN 113943191A.
Measurement of Water absorption Rate: the water absorption rate of the water absorbent is measured by adopting a natural filtration method, 5g of dry organic fertilizer is accurately weighed and put into a beaker, 1000ml of deionized water is added, the mixture is stood and swelled to saturation at room temperature, excessive water is filtered out by using a screen, the water on the surface is absorbed by using filter paper, the mixture is weighed, and the water absorption rate is calculated according to the following formula: water absorption rate= (m 2-m 1)/m 1; wherein m2 is the mass of the organic fertilizer after water absorption, and m1 is the mass of the organic fertilizer before water absorption.
Determination of Water holding Capacity: accurately weighing 5g of dry organic fertilizer, placing into a beaker, adding 1000ml of deionized water, standing at room temperature for swelling to saturation, filtering out excessive water by using a screen, weighing a proper amount of organic fertilizer by using the beaker, placing into a 35 ℃ oven, and weighing the mass of a sample every 1h until the mass is constant.
Water retention capacity b= (m 3/m 4) ×100%, m3 being resin gel mass (g) after timed dehydration; m4 mass of resin gel saturated with water.
Example 1 Effect of different degradable Natural Polymer Water retaining Agents on organic fertilizers
1) Mixing: taking 75 parts by weight of cow and sheep manure organic matters, 25 parts by weight of crushed plant straws, 25 parts by weight of humic acid, 1 part by weight of brown sugar, 10 parts by weight of starch, 2 parts by weight of urea, 4 parts by weight of calcium phosphate, 1 part by weight of potassium chloride and water, and uniformly mixing to obtain a mixture, wherein the water content of the mixture is controlled to be 50% by controlling the mixture C/N=30:1;
2) Secondary fermentation: the mixture is divided into 9 parts, EM bacterial liquid with the mass of 1.5% of the mixture is added into each part, the mixture is subjected to aerobic fermentation at 35 ℃ for 1.5 days, the mixture is turned up and down once a day, and then 2 parts by weight of degradable natural polymer water-retaining agents (chitosan, sodium alginate, sodium carboxymethyl cellulose, konjac glucomannan, agar, acacia, xanthan gum, potato hydroxypropyl starch and sodium carboxymethyl starch) are respectively added into each part, and the pile fermentation is carried out for 20 days.
The viable count, total phosphorus and total potassium retention of the organic fertilizer obtained in the different schemes of example 1 are measured, and specific results are shown in Table 1.
TABLE 1
The stability of the natural high-molecular water-retaining agent can be influenced due to the fermentation of EM bacteria and the metabolic products such as complex enzyme preparations, organic acids and the like generated by the fermentation; therefore, the compositions of different organic fertilizers and leavening agents are different from those of the degradable natural water-retaining agent matched with the organic fertilizers and the leavening agents.
From table 1, compared with natural water-retaining agents such as chitosan, sodium alginate, sodium carboxymethyl cellulose, konjac gum, agar, acacia, xanthan gum, sodium carboxymethyl starch and the like, potato hydroxypropyl starch is matched with an organic fertilizer, so that the content of EM bacteria can be increased, and due to the characteristics of thickening, film forming and the like of the potato hydroxypropyl starch, the migration of moisture during long-time fermentation of the organic fertilizer can be inhibited, so that the infiltration loss of total phosphorus and total potassium along with the moisture during fermentation is reduced, and therefore, the potato hydroxypropyl starch is selected as the natural high-molecular water-retaining agent for degradation in an anaerobic fermentation stage.
Comparative example 1: the difference from example 1 is that the potato hydroxypropyl starch is used instead of the normal starch in step 1), and the water retention agent in step 2) is selected from potato hydroxypropyl starch, otherwise the same as in example 1.
Comparative example 2: the difference from example 1 is that the starch in step 1) is omitted and the water retention agent in step 2) is potato hydroxypropyl starch, otherwise the same as in example 1.
Comparative example 3: the difference from example 1 is that starch in step 1) and the degradable natural polymer water-retaining agent in step 2) are omitted, and the other is the same as example 1.
Comparative example 4: the difference from example 1 is that the crushed plant stalks in step 1) are omitted, and the other is the same as example 1.
The viable count, total phosphorus and total potassium retention of the organic fertilizer obtained in example 1 (potato hydroxypropyl starch protocol) and comparative examples 1 to 4 were measured, and the specific results are shown in Table 2.
TABLE 2
As can be seen from Table 2, in the aerobic fermentation stage, potato hydroxypropyl starch is used for replacing common starch, and due to the water absorbability and moldability of potato hydroxypropyl starch, the air permeability in the aerobic fermentation stage is poor, the material-water ratio is unbalanced, mass propagation of EM bacteria is not facilitated, and finally the number of living EM bacteria in the organic fertilizer is greatly reduced.
Because the starch itself has weak water absorbability and viscosity, is also a carbon source of EM bacteria, and the aerobic fermentation time is short, the addition of the starch in the short-time aerobic fermentation stage can not only relieve the loss of total phosphorus and total potassium, but also has no influence on the rapid increment of EM bacteria during the aerobic fermentation. Starch is omitted in the aerobic fermentation stage, so that the total phosphorus retention rate and the total potassium retention rate of the organic fertilizer are reduced; meanwhile, starch and potato hydroxypropyl starch are omitted, and due to long anaerobic fermentation time, the lack of potato hydroxypropyl starch inhibits the migration of water, so that the total phosphorus retention rate and the total potassium retention rate are greatly reduced.
Starch is omitted, or starch and potato hydroxypropyl starch are omitted at the same time, because the starch can be used as an EM bacteria carbon source, and fermentation is carried out at the same time, starch is slowly hydrolyzed into monosaccharide which can also be used as the EM bacteria carbon source, so that the starch is lacking, and the number of living bacteria is reduced to a certain extent.
The crushed plant straw is rich in water-absorbing and water-retaining raw materials such as fiber, and the crushed plant straw can improve the overall air permeability of the organic fertilizer and facilitate fermentation, so that the crushed plant straw is omitted, and the viable count, the total phosphorus retention rate and the total potassium retention rate are all reduced.
Example 2 Effect of different degradable synthetic Polymer Water-retaining resins on organic fertilizers
1) Mixing: taking 75 parts by weight of cow and sheep manure organic matters, 25 parts by weight of crushed plant straws, 25 parts by weight of humic acid, 1 part by weight of brown sugar, 10 parts by weight of starch, 2 parts by weight of urea, 4 parts by weight of calcium phosphate, 1 part by weight of potassium chloride and water, and uniformly mixing to obtain a mixture, wherein the mixture C/N=30:1 is controlled, and the water content of the mixture is 50%;
2) Secondary fermentation: adding EM bacterial liquid with the mass of 1.5% of the mixture, carrying out aerobic fermentation at 35 ℃ for 1.5 days, turning up and down once a day, adding 2 parts by weight of potato hydroxypropyl starch which is a degradable natural polymer water-retaining agent, and carrying out pile fermentation for 20 days;
3) After fermentation, the fermentation product is divided into 7 parts, 5 parts by weight of degradable synthetic polymer water-retaining resin (gamma-PGA hydrogel, starch grafted potassium acrylate, starch grafted acrylonitrile, starch grafted amine acrylate, cellulose grafted potassium acrylate, cellulose grafted acrylonitrile, cellulose grafted amine acrylate) and 3 parts by weight of trehalose are added into each part, and the mixture is uniformly mixed and subjected to freeze-drying and crushing to obtain the water-saving water-retaining organic fertilizer.
The water absorption rate and the water holding capacity of the organic fertilizer are obtained by measuring different schemes of the example 2, and specific results are shown in the accompanying figures 1-2.
Because the natural polymer water-retaining agent is unstable and is easy to degrade, different degradable synthetic polymer water-retaining resins are further added into the fermentation product after the fermentation is finished, and the water absorption rate and the water-retaining capacity of the organic fertilizer are explored, as can be seen from the accompanying drawings 1-2 of the specification, the gamma-PGA hydrogel and the starch grafted potassium acrylate have higher water absorption multiple than other degradable synthetic water-retaining resins, wherein the gamma-PGA hydrogel (gamma-polyglutamic acid hydrogel) has the highest water absorption rate, but the gamma-PGA hydrogel has poorer water-retaining capacity and can rapidly lose water after being heated, so that the starch grafted potassium acrylate is selected as the degradable synthetic polymer water-retaining resin.
Example 3
1) Mixing: taking 75 parts by weight of cow and sheep manure organic matters, 25 parts by weight of crushed plant straws, 25 parts by weight of humic acid, 1 part by weight of brown sugar, 10 parts by weight of starch, 2 parts by weight of urea, 4 parts by weight of calcium phosphate, 1 part by weight of potassium chloride and water, and uniformly mixing to obtain a mixture, wherein the mixture C/N=30:1 is controlled, and the water content of the mixture is 50%;
2) Secondary fermentation: adding EM bacterial liquid with the mass of 1.5% of the mixture, carrying out aerobic fermentation at 35 ℃ for 1.5 days, turning up and down once a day, adding 2 parts by weight of potato hydroxypropyl starch which is a degradable natural polymer water-retaining agent, and carrying out pile fermentation for 20 days;
3) After fermentation, adding 5 parts by weight of degradable synthetic polymer water-retaining resin-starch grafted potassium acrylate and 3 parts by weight of trehalose into the fermentation product, uniformly mixing, and freeze-drying and crushing to obtain the water-saving water-retaining organic fertilizer.
Comparative example 5: the procedure was as in example 3, except that 5 parts by weight of the polymer water-retaining resin-starch graft potassium acrylate was subjected to additional fermentation in step 2).
Comparative example 6: the difference from example 3 is that the trehalose in step 3) is omitted, otherwise the same as in example 3.
The comparative example 5 has better total phosphorus retention rate and total potassium retention rate, but the viable bacteria count of the organic fertilizer is greatly reduced, probably due to the high water absorption and thickening property of starch grafted potassium acrylate, the water content of a fermentation system is reduced, the air permeability of the organic fertilizer is poor, the water ratio of a fermentation material and the oxygen amount are unbalanced, and the propagation of EM bacteria is not facilitated.
In comparative example 6, trehalose as a freeze-drying protective agent is not added, and the viable count is reduced after the organic fertilizer is freeze-dried.
Example 4
1) Mixing: taking 100 parts by weight of cow and sheep manure organic matters, 50 parts by weight of crushed plant straws, 50 parts by weight of humic acid, 3 parts by weight of brown sugar, 20 parts by weight of starch, 5 parts by weight of urea, 7 parts by weight of calcium phosphate, 4 parts by weight of potassium chloride and water, and uniformly mixing to obtain a mixture, wherein the mixture C/N=35:1 is controlled, and the water content of the mixture is 60%;
2) Secondary fermentation: adding EM bacterial liquid accounting for 2.5% of the mass of the mixture, carrying out aerobic fermentation at 40 ℃ for 1 day, turning up and down once a day, and then adding 7 parts by weight of potato hydroxypropyl starch which is a degradable natural polymer water-retaining agent, and carrying out pile fermentation at 40 ℃ for 15 days;
3) After fermentation, adding 10 parts by weight of degradable synthetic polymer water-retaining resin-starch grafted potassium acrylate and 5 parts by weight of trehalose into the fermentation product, uniformly mixing, and freeze-drying and crushing to obtain the water-saving water-retaining organic fertilizer.
Example 5
1) Mixing: taking 50 parts by weight of cow and sheep manure organic matters, 15 parts by weight of crushed plant straws, 15 parts by weight of humic acid, 0.5 part by weight of brown sugar, 8 parts by weight of starch, 1 part by weight of urea, 2 parts by weight of calcium phosphate and 0.5 part by weight of potassium chloride, and uniformly mixing with water to obtain a mixture, wherein the water content of the mixture is controlled to be 45% by weight, and the mixture is controlled to be C/N=20:1;
2) Secondary fermentation: adding EM bacterial liquid accounting for 1% of the mass of the mixture, performing aerobic fermentation at 30 ℃ for 2 days, turning up and down once a day, and then adding 1 part by weight of potato hydroxypropyl starch which is a degradable natural high polymer water-retaining agent, and performing pile fermentation for 25 days;
3) After fermentation, adding 3 parts by weight of degradable synthetic polymer water-retaining resin-starch grafted potassium acrylate and 2 parts by weight of trehalose into the fermentation product, uniformly mixing, and freeze-drying and crushing to obtain the water-saving water-retaining organic fertilizer.
While the invention has been described with reference to the preferred embodiments, it is not limited thereto, and various changes and modifications can be made therein by those skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. The preparation method of the water-saving and water-retaining organic fertilizer is characterized by comprising the following steps of:
1) Mixing: taking 50-100 parts by weight of cow and sheep manure organic matters, 15-50 parts by weight of crushed plant straws, 15-25 parts by weight of humic acid, 0.5-3 parts by weight of brown sugar, 10-20 parts by weight of starch, 1-5 parts by weight of urea, 2-7 parts by weight of calcium phosphate and 0.5-4 parts by weight of potassium chloride, and uniformly mixing with water to obtain a mixture, wherein the mixture C/N=20:1-35:1 is controlled, and the water content of the mixture is 45-60%;
2) Secondary fermentation: adding EM bacterial liquid accounting for 1-2.5% of the mass of the mixture, performing aerobic fermentation at 30-40 ℃ for 1-2 days, turning up and down once a day, adding 7 parts by weight of potato hydroxypropyl starch, and performing pile fermentation for 15-25 days;
3) After fermentation, adding 3-5 parts by weight of starch grafted potassium acrylate and 2-5 parts by weight of trehalose into the fermentation product, uniformly mixing, and freeze-drying and crushing to obtain the water-saving and water-retaining organic fertilizer.
2. The method for preparing the water-saving and water-retaining organic fertilizer according to claim 1, wherein in the step 1), 100 parts by weight of cow and sheep manure organic matters, 50 parts by weight of crushed plant straws, 25 parts by weight of humic acid, 3 parts by weight of brown sugar, 20 parts by weight of starch, 5 parts by weight of urea, 7 parts by weight of calcium phosphate and 4 parts by weight of potassium chloride are taken.
3. The method for preparing the water-saving and water-retaining organic fertilizer according to claim 1, wherein in the step 1), 75 parts by weight of cow and sheep manure organic matters, 25 parts by weight of crushed plant straws, 25 parts by weight of humic acid, 1 part by weight of brown sugar, 10 parts by weight of starch, 2 parts by weight of urea, 4 parts by weight of calcium phosphate and 1 part by weight of potassium chloride are taken.
4. The method for preparing a water-saving and water-holding organic fertilizer according to claim 1, wherein in the step 1), the water content of the mixture is controlled to be 45% by controlling the mixture C/n=20:1.
5. The method for preparing a water-saving and water-retaining organic fertilizer according to claim 1, wherein in the step 1), the water content of the mixture is controlled to be 60% by controlling the mixture C/n=35:1.
6. The method for preparing a water-saving and water-holding organic fertilizer according to claim 1, wherein in the step 1), the water content of the mixture is controlled to be 55% by controlling the mixture C/n=30:1.
7. The method for preparing the water-saving and water-retaining organic fertilizer according to claim 1, wherein in the step 2), an EM bacterial liquid with the mass of 2.5% of the mixture is added, the mixture is subjected to aerobic fermentation at 40 ℃ for 1 day, the mixture is turned up and down every day, 7 parts by weight of potato hydroxypropyl starch is added, and the pile fermentation is carried out for 15 days.
8. The method for preparing the water-saving and water-retaining organic fertilizer according to claim 1, wherein in the step 2), an EM bacterial liquid with the mass of 1.5% of the mixture is added, the mixture is subjected to aerobic fermentation at 35 ℃ for 1.5 days, the mixture is turned up and down every day, 2 parts by weight of potato hydroxypropyl starch is added, and the pile fermentation is carried out for 20 days.
9. The method for preparing the water-saving and water-retaining organic fertilizer according to claim 1, wherein in the step 3), after the fermentation is finished, 3 parts by weight of starch grafted potassium acrylate and 2 parts by weight of trehalose are added into the fermentation product, and the mixture is uniformly mixed and then subjected to freeze-drying and crushing to obtain the water-saving and water-retaining organic fertilizer.
10. The method for preparing the water-saving and water-retaining organic fertilizer according to claim 1, wherein in the step 3), after the fermentation is finished, 5 parts by weight of starch grafted potassium acrylate and 3 parts by weight of trehalose are added to the fermentation product, and the mixture is uniformly mixed and then subjected to freeze-drying and crushing to obtain the water-saving and water-retaining organic fertilizer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410557832.7A CN118125889B (en) | 2024-05-08 | Water-saving and water-retaining organic fertilizer and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410557832.7A CN118125889B (en) | 2024-05-08 | Water-saving and water-retaining organic fertilizer and preparation method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN118125889A CN118125889A (en) | 2024-06-04 |
| CN118125889B true CN118125889B (en) | 2024-07-16 |
Family
ID=
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107129361A (en) * | 2017-05-15 | 2017-09-05 | 柳州凡科技有限公司 | A kind of mango fertilizer |
| CN109336696A (en) * | 2018-12-08 | 2019-02-15 | 广西尚农生物科技有限公司 | A kind of composite environment-friendly type biological organic fertilizer and preparation method thereof |
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107129361A (en) * | 2017-05-15 | 2017-09-05 | 柳州凡科技有限公司 | A kind of mango fertilizer |
| CN109336696A (en) * | 2018-12-08 | 2019-02-15 | 广西尚农生物科技有限公司 | A kind of composite environment-friendly type biological organic fertilizer and preparation method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109679857A (en) | A kind of compost maturity microbial inoculum | |
| CN105439689B (en) | A kind of plant culture matrix produced using bamboo scraps | |
| CN107032922A (en) | A kind of humic acid functional bio-feritlizer and preparation method thereof | |
| CN108675863A (en) | A kind of soil conditioner and preparation method thereof of prevention soil hardening absorption heavy metal | |
| CN110066203A (en) | A kind of kudzu charcoal soil conditioner and preparation method thereof | |
| CN109429993A (en) | A kind of cultivation matrix of the algae-residue containing asparagus and preparation method thereof | |
| CN111170794A (en) | Saline-alkali soil improvement fertilizer and preparation method thereof | |
| CN113024307B (en) | Organic matrix for planting and preparation method and application thereof | |
| CN104788980B (en) | Controllable biodegradable material and application thereof | |
| CN117534526A (en) | Biological organic fertilizer for coastal saline-alkali soil and preparation method thereof | |
| CN112299914A (en) | Preparation method of special biological slow-release fertilizer for rice | |
| CN118125889B (en) | Water-saving and water-retaining organic fertilizer and preparation method thereof | |
| CN112876299A (en) | Straw rapid degradation microbial inoculum composition and preparation method thereof | |
| CN114342729B (en) | Organic planting method for pecans | |
| CN118125889A (en) | Water-saving and water-retaining organic fertilizer and preparation method thereof | |
| JP2007138123A (en) | Soil-improving material from peat moss and method for growing plant using the same | |
| CN114874043A (en) | Compound bio-organic fertilizer for improving saline-alkali soil and preparation method thereof | |
| CN111792961A (en) | Novel water-retaining fertilizer and preparation method thereof | |
| CN109181701B (en) | Soil conditioner and preparation method thereof | |
| CN108586096B (en) | Crop seed seedling culture medium and preparation method thereof | |
| CN102249755A (en) | Farmland ginseng planting soil conditioner | |
| CN115322056A (en) | Application of water-retaining agent and application of composite bio-organic fertilizer with water-retaining function | |
| CN112430163A (en) | Biological fertilizer for relieving continuous cropping obstacle of watermelon with pressed sand | |
| CN106478190B (en) | Soilless seedling culture substrate for eggplants and preparation method thereof | |
| CN110577448A (en) | Environment-friendly soil water-retaining agent for straw returning by matching with decomposition agent and preparation method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant |