CN1059333A - Inorganic soil conditioner and its preparation - Google Patents
Inorganic soil conditioner and its preparation Download PDFInfo
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- CN1059333A CN1059333A CN90107415A CN90107415A CN1059333A CN 1059333 A CN1059333 A CN 1059333A CN 90107415 A CN90107415 A CN 90107415A CN 90107415 A CN90107415 A CN 90107415A CN 1059333 A CN1059333 A CN 1059333A
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- temperature
- regulating agent
- inorganic soil
- soil
- inorganic
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- 239000003516 soil conditioner Substances 0.000 title abstract 5
- 238000002360 preparation method Methods 0.000 title abstract 2
- 239000002689 soil Substances 0.000 claims abstract description 57
- 239000000654 additive Substances 0.000 claims abstract description 7
- 230000000996 additive effect Effects 0.000 claims abstract description 5
- 239000003795 chemical substances by application Substances 0.000 claims description 46
- 230000001105 regulatory effect Effects 0.000 claims description 27
- 238000003756 stirring Methods 0.000 claims description 25
- 230000003750 conditioning effect Effects 0.000 claims description 21
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims description 11
- 239000004202 carbamide Substances 0.000 claims description 11
- 238000012216 screening Methods 0.000 claims description 11
- 238000004519 manufacturing process Methods 0.000 claims description 10
- 238000000498 ball milling Methods 0.000 claims description 9
- 238000001035 drying Methods 0.000 claims description 9
- PAWQVTBBRAZDMG-UHFFFAOYSA-N 2-(3-bromo-2-fluorophenyl)acetic acid Chemical compound OC(=O)CC1=CC=CC(Br)=C1F PAWQVTBBRAZDMG-UHFFFAOYSA-N 0.000 claims description 8
- 238000007599 discharging Methods 0.000 claims description 8
- VWDWKYIASSYTQR-UHFFFAOYSA-N sodium nitrate Chemical compound [Na+].[O-][N+]([O-])=O VWDWKYIASSYTQR-UHFFFAOYSA-N 0.000 claims description 8
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 7
- 239000001257 hydrogen Substances 0.000 claims description 7
- 229910052739 hydrogen Inorganic materials 0.000 claims description 7
- 239000000203 mixture Substances 0.000 claims description 5
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 4
- GFIKIVSYJDVOOZ-UHFFFAOYSA-L calcium;fluoro-dioxido-oxo-$l^{5}-phosphane Chemical compound [Ca+2].[O-]P([O-])(F)=O GFIKIVSYJDVOOZ-UHFFFAOYSA-L 0.000 claims description 4
- 239000002893 slag Substances 0.000 claims description 4
- 239000004317 sodium nitrate Substances 0.000 claims description 4
- 229940001516 sodium nitrate Drugs 0.000 claims description 4
- 235000010344 sodium nitrate Nutrition 0.000 claims description 4
- OBSZRRSYVTXPNB-UHFFFAOYSA-N tetraphosphorus Chemical compound P12P3P1P32 OBSZRRSYVTXPNB-UHFFFAOYSA-N 0.000 claims description 4
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 claims description 2
- 229910021529 ammonia Inorganic materials 0.000 claims description 2
- 239000001110 calcium chloride Substances 0.000 claims description 2
- 229910001628 calcium chloride Inorganic materials 0.000 claims description 2
- 239000003337 fertilizer Substances 0.000 abstract description 5
- 230000033116 oxidation-reduction process Effects 0.000 abstract 2
- 238000000354 decomposition reaction Methods 0.000 abstract 1
- 238000000034 method Methods 0.000 description 13
- 239000002253 acid Substances 0.000 description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 5
- 239000005864 Sulphur Substances 0.000 description 5
- 239000000126 substance Substances 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- GHOKWGTUZJEAQD-ZETCQYMHSA-N (D)-(+)-Pantothenic acid Chemical compound OCC(C)(C)[C@@H](O)C(=O)NCCC(O)=O GHOKWGTUZJEAQD-ZETCQYMHSA-N 0.000 description 4
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 3
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 3
- 239000011575 calcium Substances 0.000 description 3
- 229910052791 calcium Inorganic materials 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- 239000011777 magnesium Substances 0.000 description 3
- 229910052749 magnesium Inorganic materials 0.000 description 3
- 239000011573 trace mineral Substances 0.000 description 3
- 235000013619 trace mineral Nutrition 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- GHOKWGTUZJEAQD-UHFFFAOYSA-N Chick antidermatitis factor Natural products OCC(C)(C)C(O)C(=O)NCCC(O)=O GHOKWGTUZJEAQD-UHFFFAOYSA-N 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 2
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 2
- 239000003513 alkali Substances 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 238000006386 neutralization reaction Methods 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 229940055726 pantothenic acid Drugs 0.000 description 2
- 235000019161 pantothenic acid Nutrition 0.000 description 2
- 239000011713 pantothenic acid Substances 0.000 description 2
- 229910052698 phosphorus Inorganic materials 0.000 description 2
- 239000011574 phosphorus Substances 0.000 description 2
- 239000002574 poison Substances 0.000 description 2
- 231100000614 poison Toxicity 0.000 description 2
- 239000011701 zinc Substances 0.000 description 2
- 229910052725 zinc Inorganic materials 0.000 description 2
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 229930013930 alkaloid Natural products 0.000 description 1
- 150000003797 alkaloid derivatives Chemical class 0.000 description 1
- BFNBIHQBYMNNAN-UHFFFAOYSA-N ammonium sulfate Chemical compound N.N.OS(O)(=O)=O BFNBIHQBYMNNAN-UHFFFAOYSA-N 0.000 description 1
- 229910052921 ammonium sulfate Inorganic materials 0.000 description 1
- 235000011130 ammonium sulphate Nutrition 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 150000001768 cations Chemical class 0.000 description 1
- 239000000460 chlorine Substances 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 210000003608 fece Anatomy 0.000 description 1
- 229910052602 gypsum Inorganic materials 0.000 description 1
- 239000010440 gypsum Substances 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 239000010871 livestock manure Substances 0.000 description 1
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005649 metathesis reaction Methods 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 235000015097 nutrients Nutrition 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 150000003016 phosphoric acids Chemical class 0.000 description 1
- 230000029553 photosynthesis Effects 0.000 description 1
- 238000010672 photosynthesis Methods 0.000 description 1
- 230000008635 plant growth Effects 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000006479 redox reaction Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Landscapes
- Fertilizers (AREA)
Abstract
The invention provides an inorganic soil conditioner with comprehensive regulation performance on pH value and oxidation-reduction potential En of soil and a preparation method thereof. The inorganic soil conditioner is formed by mixing 60-80% of pH value regulator, 15-35% of oxidation-reduction potential En regulator and additive at high temperature. The inorganic soil conditioner is characterized in that the inorganic soil conditioner slowly generates double decomposition reaction in soil, maintains the pH value of the soil in the optimal range of 6 +/-0.5, plays a role in comprehensive fertilizer efficiency, improves the soil structure and achieves the purposes of increasing the yield and income.
Description
The invention provides a kind of inorganic soil regulating agent and manufacture method.This inorganic soil regulating agent is suitable for that water is planted or drought is planted the crop field and used.
Outside contained essential element de-carbon, the oxygen of crop can absorb from air, other big or middle element such as phosphorus, calcium, magnesium, sulphur etc. all absorbed from soil as iron, zinc, copper, chlorine etc. with trace element.Crop is not only determined by soil element content and form the absorption of above-mentioned element, but also is subjected to influence of various factors such as soil acidity or alkalinity PH and redox potential En.Because elements such as the oxygen in the soil, nitrogen, sulphur, iron are easy to take place redox reaction, soil has certain redox potential En, and it influence crop to trace elements absorbed such as iron, sulphur, thus regulate P in soil H and En significant.
Existing method of regulating P in soil H has: 1. WATER-WASHING METHOD.Dilute with water is also removed soil partly acid, alkaloid substance; 2. waterflooding relieving haperacidity method.The oxidation of sulphur in the control soil reduces and produces acid; 3. sulphur is executed in semi dry cultivation, promotes soil to produce acid; 4. neutralisation.With molten fertile, the physiological alkalinity chemical fertilizer of lime, stove, as alkaline matters such as plant ash, scorched clay dusts, in and acid; Use physiological acidic fertilizer, as in ammonium sulfate, the gypsum etc. and alkaline substance; The applications of farmyard manure material also has the effect of certain buffering soil acidity or alkalinity.But also there is not the special-purpose regulating agent special of regulating soil redox potential.
Above method is to the comprehensive adjustment poor performance of P in soil H and En, use inconvenient, effect is also undesirable, especially to potential of hydrogen PH and the bigger low-yield lands of redox potential En deviation such as cold-water paddy field, mud field, pantothenic acid field, poison fields, ore deposit, not only investment cost is big, and be difficult for grasping usage quantity, effect is poorer.
The object of the present invention is to provide a kind of inorganic soil regulating agent and the manufacture method thereof good to the comprehensive adjustment performance of soil acidity or alkalinity PH and soil redox potential En.This conditioning agent can effectively improve soil physico-chemical characteristic, and fertilizer efficiency is provided, and reaches the purpose of increasing both production and income.
The present invention is achieved in that by potential of hydrogen PH conditioning agent (P), contains (weight %) in the inorganic soil regulating agent that redox potential En conditioning agent (E) is formed to be:
60~80% potential of hydrogen PH conditioning agents (P)
15~35% redox potential En conditioning agents (E)
5~10% additives (T)
The each component summation is 100%.
Potential of hydrogen PH conditioning agent (P) is: rhombspar or calcium monofluorophosphate or Wingdale or yellow phosphorus furnace slag.
Redox potential En conditioning agent (E) is: ammonium nitrate or SODIUMNITRATE.
Additive (T) is: urea or calcium chloride eight ammonia mixture CaCINH.
The manufacture method of producing inorganic soil regulating agent is as follows:
1, with conditioning agent (P) drying and crushing, ball milling becomes the above fineness powder of 80 orders, and conditioning agent (E) is through crushing screening; Additive (T) is through crushing screening.
2, conditioning agent (P) and conditioning agent (E) are mixed in proportion, and in certain temperature, constantly stir, the cooling back adds the additive (T) of crushing screening, restir is even, be cooled to normal temperature after, pulverize again, promptly obtain inorganic soil regulating agent.
Method I: drying is pulverized, ball milling becomes the rhombspar 60~80% of the above fineness of 80 orders and ammonium nitrate 15~35% through crushing screening to mix, and under 169~210 ℃ of temperature, constantly stir, when waiting to cool to below 160 ℃, add CaCINH or urea 5~10%, and in 30~150 ℃ of temperature, continue stirring and processing, the back discharging stirs, through being cooled to normal temperature, pulverize again, promptly get inorganic soil regulating agent.
Method II: drying is pulverized, ball milling becomes the calcium monofluorophosphate 60~80% of the above fineness of 80 orders and ammonium nitrate 15~35% through crushing screening to mix, and under 169~210 ℃ of temperature, constantly stir, when waiting to cool to below 160 ℃, add CaCINH or urea 5~10%, and in 30~150 ℃ of temperature, continue stirring and processing, the back discharging stirs, through being cooled to normal temperature, pulverize again, promptly get inorganic soil regulating agent.
Method III: drying is pulverized, ball milling becomes the yellow phosphorus furnace slag 60~80% of the above fineness of 80 orders and SODIUMNITRATE 15~35% through crushing screening to mix, and under 169~210 ℃ of temperature, constantly stir, when waiting to cool to below 160 ℃, add urea 5~10%, and in 30~150 ℃ of temperature, continue stirring and processing, the back discharging stirs, through being cooled to normal temperature, pulverize again, promptly get inorganic soil regulating agent.
Method IV: drying is pulverized, ball milling becomes the Wingdale 60~80% of the above fineness of 80 orders and ammonium nitrate 15~35% through crushing screening to mix, and under 169~210 ℃ of temperature, constantly stir, when waiting to cool to below 160 ℃, add urea or CaCINH5~10%, and in 30~150 ℃ of temperature, continue stirring and processing, the back discharging stirs, through being cooled to normal temperature, pulverize again, promptly get inorganic soil regulating agent.
This inorganic soil regulating agent is a kind of neutral inorganic mixture, therefore, can not cause soil to produce acid evil or alkali evil.This is because this conditioning agent is not common direct acid, alkali neutralization reaction in soil, but by carbonate, phosphoric acid salt etc. replacement(metathesis)reaction takes place lentamente, keeps P in soil H in 6 ± 0.5 optimum range.This inorganic soil regulating agent can also replenish a certain amount of nitrogen, phosphorus, calcium, magnesium, manganese, zinc element to soil, and its actual comprehensive fertilizer efficiency (increasing both production and income) reaches equivalent urea efficiency level, and cost is lower.Because this conditioning agent deferred reaction in soil, thermopositive reaction slowly takes place in release of carbon dioxide, increases cation concns such as calcium, magnesium, reduce the concentration factor of water, reduce specific heat capacity, so, help the crop photosynthesis effect, be easy to improve ground temperature, help plant growth, and improve Soil structure, reduce the soil compaction phenomenon.Also help and improve and stable soil redox potential En.
This conditioning agent is particularly useful for southern acid soil or redox potential En soil on the low side, especially to multiple low-yield lands such as cold-water paddy field, mud field, pantothenic acid field, poison fields, ore deposit, can significantly improve its soil physico-chemical characteristic after the use, especially after polynary composite trace element foliar nutrient is used in merging, can obtain high yield.
This conditioning agent manufacture method is simple, and cost is lower, is easy to promote.
Claims (6)
1, a kind of inorganic soil regulating agent that soil acidity or alkalinity PH and soil redox potential En is played comprehensive adjusting function, form by potential of hydrogen PH conditioning agent (P), redox potential En conditioning agent (E), it is characterized in that containing in this inorganic soil regulating agent (weight %) and be;
60~80% potential of hydrogen PH conditioning agents (P)
15~35% redox potential En conditioning agents (E)
5~10% additives (T)
The each component summation is 100%.
2, inorganic soil regulating agent according to claim 1 is characterized in that:
A. potential of hydrogen PH conditioning agent is: rhombspar or calcium monofluorophosphate or Wingdale or yellow phosphorus furnace slag.
B. redox potential En conditioning agent (E) is: ammonium nitrate or SODIUMNITRATE.
C. additive (T) is: urea or calcium chloride eight ammonia mixture CaCL.NH.
3, the production method of inorganic soil regulating agent according to claim 1, it is characterized in that, drying is pulverized, ball milling becomes the above fineness of 80 orders rhombspar 60~80% and ammonium nitrate 15~35% through crushing screening are mixed, and under 169~210 ℃ of temperature, constantly stir, when waiting to cool to below 160 ℃, add CaCLNH or urea 5~10%, and in 30~150 ℃ of temperature, continue stirring and processing, the back discharging stirs, through being cooled to normal temperature, pulverize again, promptly get inorganic soil regulating agent.
4, the production method of inorganic soil regulating agent according to claim 1, it is characterized in that, drying is pulverized, ball milling becomes the above fineness of 80 orders calcium monofluorophosphate 60~80% and ammonium nitrate 15~30% through crushing screening are mixed, and under 169~210 ℃ of temperature, constantly stir, when waiting to cool to below 160 ℃, add CaClNH or urea 5~10%, and in 30~150 ℃ of temperature, continue stirring and processing, the back discharging stirs, through being cooled to normal temperature, pulverize again, promptly get inorganic soil regulating agent.
5, the production method of inorganic soil regulating agent according to claim 1, it is characterized in that, drying and crushing, ball milling are become the yellow phosphorus furnace slag 60~80% of the above fineness of 80 orders and SODIUMNITRATE 15~35% mix, and under 169~210 ℃ of temperature, constantly stir, when waiting to cool to below 160 ℃ through crushing screening, add urea 5~10%, and in 30~150 ℃ of temperature, continuing stirring and processing, the back discharging that stirs is through being cooled to normal temperature, pulverize again, promptly get inorganic soil regulating agent.
6, the production method of inorganic soil regulating agent according to claim 1, it is characterized in that, drying and crushing, ball milling are become the Wingdale 60~80% of the above fineness of 80 orders and ammonium nitrate 15~35% mix, and under 169~210 ℃ of temperature, constantly stir, when waiting to cool to below 160 ℃ through crushing screening, add urea or CaCINH5~10%, and in 30~150 ℃ of temperature, continuing stirring and processing, the back discharging that stirs is through being cooled to normal temperature, pulverize again, promptly get inorganic soil regulating agent.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN90107415A CN1059333A (en) | 1990-08-29 | 1990-08-29 | Inorganic soil conditioner and its preparation |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN90107415A CN1059333A (en) | 1990-08-29 | 1990-08-29 | Inorganic soil conditioner and its preparation |
Publications (1)
Publication Number | Publication Date |
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CN1059333A true CN1059333A (en) | 1992-03-11 |
Family
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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CN90107415A Pending CN1059333A (en) | 1990-08-29 | 1990-08-29 | Inorganic soil conditioner and its preparation |
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Country | Link |
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CN (1) | CN1059333A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102199055A (en) * | 2010-03-25 | 2011-09-28 | 冯涛 | Compound fertilizer |
CN103360015A (en) * | 2013-04-24 | 2013-10-23 | 华南理工大学 | Method for producing nutrient-type soil heavy metal solidifying agent from low-grade phosphate ore |
CN104893733A (en) * | 2015-05-18 | 2015-09-09 | 中国农业科学院烟草研究所 | Nutritional type tobacco field soil acidification modifier formula and use method thereof |
CN107177356A (en) * | 2017-06-07 | 2017-09-19 | 中国农业科学院农业资源与农业区划研究所 | " lime material+organic fertilizer " improves the accurate proportioning method of acidified soil |
-
1990
- 1990-08-29 CN CN90107415A patent/CN1059333A/en active Pending
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102199055A (en) * | 2010-03-25 | 2011-09-28 | 冯涛 | Compound fertilizer |
CN103360015A (en) * | 2013-04-24 | 2013-10-23 | 华南理工大学 | Method for producing nutrient-type soil heavy metal solidifying agent from low-grade phosphate ore |
CN103360015B (en) * | 2013-04-24 | 2015-06-03 | 华南理工大学 | Method for producing nutrient-type soil heavy metal solidifying agent from low-grade phosphate ore |
CN104893733A (en) * | 2015-05-18 | 2015-09-09 | 中国农业科学院烟草研究所 | Nutritional type tobacco field soil acidification modifier formula and use method thereof |
CN104893733B (en) * | 2015-05-18 | 2018-09-11 | 中国农业科学院烟草研究所 | A kind of auxotype vega soil acidification improvement agent prescription and its application method |
CN107177356A (en) * | 2017-06-07 | 2017-09-19 | 中国农业科学院农业资源与农业区划研究所 | " lime material+organic fertilizer " improves the accurate proportioning method of acidified soil |
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