CN101284748A - Multi-element and slow-released fertilizer - Google Patents

Multi-element and slow-released fertilizer Download PDF

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Publication number
CN101284748A
CN101284748A CNA2008100728884A CN200810072888A CN101284748A CN 101284748 A CN101284748 A CN 101284748A CN A2008100728884 A CNA2008100728884 A CN A2008100728884A CN 200810072888 A CN200810072888 A CN 200810072888A CN 101284748 A CN101284748 A CN 101284748A
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fertilizer
slow
released
potassium
phosphate
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CNA2008100728884A
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谢浩
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P60/00Technologies relating to agriculture, livestock or agroalimentary industries
    • Y02P60/20Reduction of greenhouse gas [GHG] emissions in agriculture, e.g. CO2
    • Y02P60/21Dinitrogen oxide [N2O], e.g. using aquaponics, hydroponics or efficiency measures

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Abstract

The invention relates to a long-acting multi-element fertilizer which is prepared by raw materials of urea, overbearing calcium phosphate or diammonium phosphate, ammonium diacid phosphate, agricultural potassium sulphate, potassium oxide or potassium chloride and fertilizer additives. The fertilizer is based on nitrogen, phosphorus and potassium, and has humate and yellow phosphorus furnace slag silicon fertilizer or iron slag silicon fertilizer as well as blended raw ore powder containing porphyraceous feldspar granite, medical stone, bentonite clay and lanthanide rare earth added thereto, wherein, the humate and the yellow phosphorus furnace slag silicon fertilizer or iron slag silicon fertilizer contain many active materials, the blended raw ore powder contains long-acting elements such as phosphorus, potassium, middle elements, trace elements, as well as beneficial elements including silicon, sodium, cobalt, selenium, nickel, titanium and iodine, etc. According to the field experiments, the long-acting multi-element fertilizer can supply all nutrient elements required by crops, thereby promoting the crop growth.

Description

A kind of multi-element and slow-released fertilizer
Technical field
The present invention relates to a kind of multi-element and slow-released fertilizer that is applicable to that farm crop are used.
Background technology
The history in existing more than 100 year of the application of chemical fertilizer on agricultural.The middle and later periods eighties, compound (mixing) fertile industry development of China is very fast, has experienced binary compound fertilizer, ternary compound (mixing) fertilizer, multi-element compound fertilizer and the fertile several stages of organic and inorganic compound.Just develop at present towards the direction of slow-release or control-release fertilizer.
Use compound (mixing) fertilizer and can overcome the unbalance problem of soil nutrient that chemical fertilizer of simple substance brings of using substantially.But the effective rate of utilization fertile because of existing compound (mixing) is low, and it is fast to run off, and wastage is big, can't thoroughly solve the pollution problem of soil compaction and underground water source atmosphere soil.Simultaneously, its nutritive ingredient is few, can't supply with farm crop comprehensively and grow required nutritive element, thereby it is limited to increase potentiality.
In order to solve chemical fertilizer quick contradiction of slowly absorbing of leaching loss and crop in soil, carried out the research of slow-release or control-release fertilizer both at home and abroad, to improve the chemical fertilizer nutrient effective rate of utilization, reduce the usage quantity and the application times of chemical fertilizer, save the raw material (coal, electric ﹠ gas) of producing chemical fertilizer, alleviate the destruction of chemical fertilizer, have in the research at present: 1, coating release tech ecotope.Mainly with thermohardening resin coated, thermoplastic resin membrane wrapping, sulphur and sulfur and resin coated etc. with the release rate of control chemical fertilizer, reaches the purpose of slow release long-acting.Because this technology is subjected to the influence of membrane wrapping thickness, temperature, moisture bigger, so the effect less stable.In addition, complete processing is complicated, the equipment cost height, and the distillation of resin degraded and sulphur causes secondary environmental pollution.2, enzyme suppresses technology.Main nitrifying ferment inhibitor and the urease inhibitors of adopting handled urea, to delay urea hydrolysis rate in soil, prolongs fertilizer efficiency.Because this technology exists temperature and soil texture influence to suppress effect.This technology does not have effect to phosphate fertilizer and potash fertilizer in addition.3, fertilizer nutrition promotor (fertile companion), this product main component is poly-aspartic-acid (TPA), nutritive ingredient had very strong electronics absorption, hole absorption and sequestering power, but the nutritive element in the enrichment fertilizer sweetening of the soil, slowly discharge according to the demand of crop, make crop not take off fertilizer, not early ageing fertilizer.This product draws the NANOCHEM company from the U.S..
Chinese patent ZL021223815 " rare earth silicon-calcium fertilizer and production method thereof ", this fertilizer is made of urea, double superhosphate, potash fertilizer, rare-earth mineral and Water Quenching Slag.Raw material double superhosphate wherein, its water-soluble content does not reach 50%, the technological standard of concentration compound fertilizer in not reaching; Raw material rare earth breeze is a kind of indissoluble or slow water-soluble metallic element, and it is difficult for being utilized in earlier stage by this season crop; Containing the very poor element silicon of movability in the raw material Water Quenching Slag, is infeasible with Water Quenching Slag as the raw material of producing compound fertilizer.Add 7% zinc sulfate and manganous sulfate, 5% ferrous sulfate in the fertilizer, excessive being difficult to of its consumption accepted by manufacturer.
Chinese patent 971256942 " biochemical long lasting fertilizer and production method thereof ", selecting weathered coal in this fertilizer for use is inhibitor---activator, siliceous potassium primary mineral is the mineral stablizer, metal sulfate is a sequestrant, with urea, phosphoric acid salt, sylvite is raw material, process under specific processing condition, the nutritive element kind that this product adopts is less, and be difficult to provides crop growth required nutritional requirement comprehensively.
Summary of the invention
The object of the invention is to provide a kind of multi-element and slow-released fertilizer and preparation method thereof, and this multi-element and slow-released fertilizer is to be made by feed composition urea, double superhosphate or diammonium phosphate, monoammonium phosphate, agricultural potassium sulfate, potassium oxide or Repone K and fertilizer additive.This fertilizer is based on nitrogen phosphorus potassium, added humate, yellow phosphorus furnace slag siliceous fertilizer or the blast furnace slag siliceous fertilizer that contains the various active material and contained blend rawore breeze like the long grouan of spot shape, medical stone, wilkinite, lanthanide rare composition (contain phosphorus potassium, moderate-element, trace element, rare earth element, beneficial element---silicon, sodium, cobalt, selenium, nickel, titanium, iodine etc. delay the dissolubility elements for tens of kinds).This multi-element and slow-released fertilizer can be supplied with the required nutritive element of crop growth comprehensively.Through field test, its result shows: under the condition that reduces application quantity of nitrogen phosphorus potassium, and grape yield increasing 8.7-9.8% (soluble solid improves the 0.8-1.3 degree); Melon production promoting 6.8% (soluble solid improves 0.6 degree); Corn yield increasing 12.8%, cotton volume increase 7-9.6%, the high blast resisting volume increase 7.7% of paddy rice, wheat increase yield 11.5%, system sauce tomato production promoting 7.5-20% (Lyeopene improves 11%, and soluble solid improves 38.44%), capsicum volume increase 9.8%, cucumber production promoting 16.7%.
A kind of multi-element and slow-released fertilizer of the present invention, be that potassium oxide or Repone K 3-5% and fertilizer additive 15-20% make by feed composition weight percent urea 20-45%, double superhosphate or diammonium phosphate 25-35%, monoammonium phosphate 10-15%, agricultural potassium sulfate 2-5%.
Described multi-element and slow-released fertilizer feed composition is preferably weight percent urea 23-40%, double superhosphate or diammonium phosphate 30-35%, monoammonium phosphate 10-12%, agricultural potassium sulfate 2-5%, and potassium oxide or Repone K 3-5% and fertilizer additive 15-20% make.
Described multi-element and slow-released fertilizer feed composition the best is preferably weight percent urea 30-35%, double superhosphate or diammonium phosphate 30-35%, monoammonium phosphate 12-15%, agricultural potassium sulfate 4-5%, and potassium oxide or Repone K 4-5% and fertilizer additive 15-20% make.
Fertilizer additive is siliceous fertilizer, humate and contains the seemingly blend rawore breeze of the long grouan of spot shape, medical stone, wilkinite and lanthanide rare composition.
Siliceous fertilizer is yellow phosphorus furnace slag siliceous fertilizer or blast furnace slag siliceous fertilizer.
The preparation method of described multi-element and slow-released fertilizer is broken into particle with each raw material powder, and the 100-120 order that sieves mixes in proportion and gets final product.
Multi-element and slow-released fertilizer of the present invention has the physiologically active and the Nutrition and Metabolism function that can strengthen the plant body, the activity of regulatory enzyme, promote hormone in vivo to form, improve immunizing power, promote the activity of well developed root system and root, strengthen catheter, improve and absorb and the conveying turn-over capacity efficiency of light energy utilization of raising utilization rate of fertilizer and functional leaf, enhancing photosynthesis, improve output, improve the integrated quality of product.The present invention has very strong absorption, chelating and ion-exchange capacity to nutritive element, but in the enrichment soil and fertilizer in nutritive element.Need fertilizer according to crop growth requires and slowly release, makes crop not take off fertilizer, not early ageing.The present invention can increase that the anti-volt of crop falls, disease-resistant worm, drought resisting, hot-dry wind tolerance, cold-resistant salt tolerant alkali ability.Can improve soil aggregate, alleviate soil compaction, remains of pesticide and harmful heavy metal in degraded and the absorption soil, the balance soil acidity or alkalinity is improved field microclimate.
Embodiment
Embodiment 1 (weight percent)
With raw material urea 20%, double superhosphate 35%, monoammonium phosphate 15%, agricultural potassium sulfate 5%, potassium oxide 5% and fertilizer additive yellow phosphorus furnace slag siliceous fertilizer 7%, humate 7% with contain blend rawore breeze 6% like the long grouan of spot shape, medical stone and wilkinite lanthanide rare composition, separated pulverizing becomes particle, 100 orders that sieve mix and promptly can be made into multi-element and slow-released fertilizer.
Embodiment 2 (weight percent)
With raw material urea 45%, diammonium phosphate 25%, monoammonium phosphate 10%, agricultural potassium sulfate 2%, Repone K 3% and fertilizer additive blast furnace slag siliceous fertilizer 6%, humate 5% and contain blend rawore breeze 4% like the long grouan of spot shape, medical stone, wilkinite lanthanide rare composition, be ground into particle, 110 orders that sieve mix and promptly can be made into multi-element and slow-released fertilizer.
Embodiment 3 (weight percent)
With raw material urea 30%, double superhosphate 30%, monoammonium phosphate 12%, agricultural potassium sulfate 3%, Repone K 5% and fertilizer additive yellow phosphorus furnace slag siliceous fertilizer 7%, humate 7% with contain blend rawore breeze 6% like the long grouan of spot shape, medical stone, wilkinite lanthanide rare composition, be ground into particle, 120 orders that sieve mix and promptly can be made into multi-element and slow-released fertilizer.
Embodiment 4 (weight percent)
With raw material urea 23%, double superhosphate 35%, monoammonium phosphate 12%, agricultural potassium sulfate 5%, potassium oxide 5% and fertilizer additive blast furnace slag siliceous fertilizer 7%, humate 7% with contain blend rawore breeze 6% like the long grouan of spot shape, medical stone, wilkinite lanthanide rare composition, be ground into particle, 100 orders that sieve mix and promptly can be made into multi-element and slow-released fertilizer.
Embodiment 5 (weight percent)
With raw material urea 40%, diammonium phosphate 30%, monoammonium phosphate 10%, agricultural potassium sulfate 2%, Repone K 3% and fertilizer additive yellow phosphorus furnace slag siliceous fertilizer 7%, humate 5% and contain blend rawore breeze 3% like the long grouan of spot shape, medical stone, wilkinite lanthanide rare composition, be ground into particle, 110 orders that sieve mix and promptly can be made into multi-element and slow-released fertilizer.
Embodiment 6 (weight percent)
With raw material urea 34%, double superhosphate 30%, monoammonium phosphate 12%, agricultural potassium sulfate 3%, potassium oxide 3% and fertilizer additive blast furnace slag siliceous fertilizer 7%, humate 6% and contain blend rawore breeze 5% like the long grouan of spot shape, medical stone, wilkinite lanthanide rare composition, be ground into particle, 120 orders that sieve mix and promptly can be made into multi-element and slow-released fertilizer.
Embodiment 7 (weight percent)
With raw material urea 30%, double superhosphate 35%, monoammonium phosphate 12%, agricultural potassium sulfate 3%, potassium oxide 4% and fertilizer additive yellow phosphorus furnace slag siliceous fertilizer 7%, humate 5% and contain blend rawore breeze 4% like the long grouan of spot shape, medical stone, wilkinite lanthanide rare composition, be ground into particle, 100 orders that sieve mix and promptly can be made into multi-element and slow-released fertilizer.
Embodiment 8 (weight percent)
With raw material urea 35%, diammonium phosphate 30%, monoammonium phosphate 10%, agricultural potassium sulfate 2%, potassium oxide 5% and fertilizer additive blast furnace slag siliceous fertilizer 7%, humate 7% and contain blend rawore breeze 4% like the long grouan of spot shape, medical stone, wilkinite lanthanide rare composition, be ground into particle, 120 orders that sieve mix and promptly can be made into multi-element and slow-released fertilizer.
Embodiment 9 (weight percent)
With raw material urea 30%, diammonium phosphate 25%, monoammonium phosphate 15%, agricultural potassium sulfate 5%, potassium oxide 5% and fertilizer additive yellow phosphorus furnace slag siliceous fertilizer 7%, humate 7% and contain blend rawore breeze 6% like the long grouan of spot shape, medical stone, wilkinite lanthanide rare composition, be ground into particle, 120 orders that sieve mix and promptly can be made into multi-element and slow-released fertilizer.
Embodiment 10 (weight percent)
With raw material urea 35%, double superhosphate or diammonium phosphate 30%, monoammonium phosphate 12%, agricultural potassium sulfate 4%, potassium oxide 4% and fertilizer additive blast furnace slag siliceous fertilizer 7%, humate 4% and contain blend rawore breeze 4% like the long grouan of spot shape, medical stone, wilkinite lanthanide rare composition, be ground into particle, 110 orders that sieve mix and promptly can be made into multi-element and slow-released fertilizer.
It the results are shown in Table after multi-element and slow-released fertilizer of the present invention was used for various farm crop
Use the farm crop kind Every mu of usage quantity Units increased in production and effect Volume increase %
Corn 50 kilograms Dual spike rate, single grain number per spike, the heavy obviously raising of dry granular 12.8%
System sauce tomato 1 50 kilograms Single fruit weight average weight gain 0.7g 7.5%
System sauce tomato 2 50 kilograms Lyeopene improves 11%, and soluble solids improves 38.44% 20%
Capsicum 50 kilograms The single fruit number increases 1-2, single fruit weight 2.5g storage tolerance, disease-resistant, drought resisting 9.8%
Grape 1 50 kilograms Soluble solids improves 0.8 degree, and fruit shape is even 8.7
Grape 2 50 kilograms Soluble solids improves 1.3 degree 9.8%
Muskmelon 50 kilograms Soluble solids improves 0.8 degree, and fruit shape is even 6.8%
Cucumber 50 kilograms Fruit shape is straight, and size evenly 16.7%
Cotton 50 kilograms 6.1 kilograms of volume increase gined cottons 7.0%
Color cotton 50 kilograms 9.6%
Wheat 50 kilograms 11.5%

Claims (6)

1, a kind of multi-element and slow-released fertilizer, it is characterized in that it being that potassium oxide or Repone K 3-5% and fertilizer additive 15-20% make by feed composition weight percent urea 20-45%, double superhosphate or diammonium phosphate 25-35%, monoammonium phosphate 10-15%, agricultural potassium sulfate 2-5%.
2, multi-element and slow-released fertilizer according to claim 1, it is characterized in that feed composition is preferably weight percent urea 23-40%, double superhosphate or diammonium phosphate 30-35%, monoammonium phosphate 10-12%, agricultural potassium sulfate 2-5%, potassium oxide or Repone K 3-5% and fertilizer additive 15-20% make.
3, multi-element and slow-released fertilizer according to claim 1, it is characterized in that feed composition the best is preferably weight percent urea 30-35%, double superhosphate or diammonium phosphate 30-35%, monoammonium phosphate 12-15%, agricultural potassium sulfate 4-5%, potassium oxide or Repone K 4-5% and fertilizer additive 15-20% make.
4,, it is characterized in that fertilizer additive is siliceous fertilizer, humate and contains the seemingly blend rawore breeze of the long grouan of spot shape, medical stone, wilkinite and lanthanide rare composition according to claim 1,2 and 3 described multi-element and slow-released fertilizers.
5, multi-element and slow-released fertilizer according to claim 4 is characterized in that siliceous fertilizer is yellow phosphorus furnace slag siliceous fertilizer or blast furnace slag siliceous fertilizer.
6, the preparation method of multi-element and slow-released fertilizer according to claim 1 is characterized in that each raw material powder is broken into particle, and the 100-120 order that sieves mixes in proportion and gets final product.
CNA2008100728884A 2008-05-29 2008-05-29 Multi-element and slow-released fertilizer Pending CN101284748A (en)

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Cited By (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101973811A (en) * 2010-10-08 2011-02-16 谢浩 Multielement compound fertilizer
CN101973810A (en) * 2010-10-08 2011-02-16 谢浩 Multielement drip irrigation fertilizer
CN102126894A (en) * 2011-03-26 2011-07-20 邓云村 Weeding medicinal fertilizer for direct seeding rice field
CN102199055A (en) * 2010-03-25 2011-09-28 冯涛 Compound fertilizer
CN102206111A (en) * 2011-03-31 2011-10-05 张兴华 Method for producing high-efficiency compound fertilizer by using yellow phosphorus slag and waste edible fungus bag material
CN102241536A (en) * 2011-03-31 2011-11-16 张兴华 Method for producing long-acting compound fertilizer by utilizing waste resources
CN102260119A (en) * 2011-05-19 2011-11-30 湖南省中科农业有限公司 Active enzyme organic-inorganic fertilizer
CN102344317A (en) * 2011-07-06 2012-02-08 山东宝源生物有限公司 Melon and fruit special-purposed fertilizer and application method thereof
CN101519331B (en) * 2009-04-09 2012-07-04 李财 Slow-release high-yield crop fertilizer
CN102627507A (en) * 2012-04-25 2012-08-08 福建师范大学 Preparation method of rice composite granular fertilizer with methane emission reduction function
CN101709008B (en) * 2009-12-14 2012-09-05 谭春华 Organic mineral fertilizer
CN103539502A (en) * 2013-10-15 2014-01-29 黄永生 Rice special composite fertilizer and preparation method thereof
CN104086262A (en) * 2014-06-27 2014-10-08 方小超 Special chemical fertilizer for muskmelons
CN104387207A (en) * 2014-11-03 2015-03-04 贵州省化工研究院 Fertilizer prepared from yellow phosphorus furnace slag and specially applied to kiwi fruits and preparation method of fertilizer
CN105324351A (en) * 2013-05-06 2016-02-10 沙特基础工业公司 Fertilizer compositions and methods thereof
CN107032856A (en) * 2017-05-31 2017-08-11 柳州市平盛种植场 A kind of flower planting fertilizer
CN107032931A (en) * 2017-05-31 2017-08-11 中国农业科学院农业资源与农业区划研究所 One kind changes sour auxotype composite soil conditioner and its application
CN107353132A (en) * 2017-08-25 2017-11-17 佛山市三水区嘉信农业技术研究院(普通合伙) A kind of water-soluble composite fertilizer
CN111646839A (en) * 2020-05-21 2020-09-11 河南捷农生化有限公司 Humic acid compound fertilizer and preparation method thereof
CN112661558A (en) * 2020-03-02 2021-04-16 首佳优品(北京)国际农业科技有限公司 Powder for high-quality tomatoes and preparation method and using method thereof
CN115997541A (en) * 2023-02-19 2023-04-25 贵州省园艺研究所(贵州省园艺工程技术研究中心) Application method of fertilizer suitable for full growth period of wire peppers
CN117925249B (en) * 2024-01-22 2024-07-02 西藏泰晟环保工程有限公司 Improved material for saline-alkali soil and preparation method thereof

Cited By (27)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101519331B (en) * 2009-04-09 2012-07-04 李财 Slow-release high-yield crop fertilizer
CN101709008B (en) * 2009-12-14 2012-09-05 谭春华 Organic mineral fertilizer
CN102199055A (en) * 2010-03-25 2011-09-28 冯涛 Compound fertilizer
CN101973810A (en) * 2010-10-08 2011-02-16 谢浩 Multielement drip irrigation fertilizer
CN101973811A (en) * 2010-10-08 2011-02-16 谢浩 Multielement compound fertilizer
CN101973810B (en) * 2010-10-08 2015-09-30 谢浩 A kind of multielement drip irrigation fertilizer
CN101973811B (en) * 2010-10-08 2013-03-27 谢浩 Multielement compound fertilizer
CN102126894A (en) * 2011-03-26 2011-07-20 邓云村 Weeding medicinal fertilizer for direct seeding rice field
CN102241536B (en) * 2011-03-31 2013-09-18 张兴华 Method for producing long-acting compound fertilizer by utilizing waste resources
CN102206111A (en) * 2011-03-31 2011-10-05 张兴华 Method for producing high-efficiency compound fertilizer by using yellow phosphorus slag and waste edible fungus bag material
CN102241536A (en) * 2011-03-31 2011-11-16 张兴华 Method for producing long-acting compound fertilizer by utilizing waste resources
CN102206111B (en) * 2011-03-31 2014-01-08 张兴华 Method for producing high-efficiency compound fertilizer by using yellow phosphorus slag and waste edible fungus bag material
CN102260119A (en) * 2011-05-19 2011-11-30 湖南省中科农业有限公司 Active enzyme organic-inorganic fertilizer
CN102344317A (en) * 2011-07-06 2012-02-08 山东宝源生物有限公司 Melon and fruit special-purposed fertilizer and application method thereof
CN102627507A (en) * 2012-04-25 2012-08-08 福建师范大学 Preparation method of rice composite granular fertilizer with methane emission reduction function
CN105324351A (en) * 2013-05-06 2016-02-10 沙特基础工业公司 Fertilizer compositions and methods thereof
CN103539502A (en) * 2013-10-15 2014-01-29 黄永生 Rice special composite fertilizer and preparation method thereof
CN104086262A (en) * 2014-06-27 2014-10-08 方小超 Special chemical fertilizer for muskmelons
CN104387207B (en) * 2014-11-03 2017-05-03 贵州省化工研究院 Fertilizer prepared from yellow phosphorus furnace slag and specially applied to kiwi fruits and preparation method of fertilizer
CN104387207A (en) * 2014-11-03 2015-03-04 贵州省化工研究院 Fertilizer prepared from yellow phosphorus furnace slag and specially applied to kiwi fruits and preparation method of fertilizer
CN107032856A (en) * 2017-05-31 2017-08-11 柳州市平盛种植场 A kind of flower planting fertilizer
CN107032931A (en) * 2017-05-31 2017-08-11 中国农业科学院农业资源与农业区划研究所 One kind changes sour auxotype composite soil conditioner and its application
CN107353132A (en) * 2017-08-25 2017-11-17 佛山市三水区嘉信农业技术研究院(普通合伙) A kind of water-soluble composite fertilizer
CN112661558A (en) * 2020-03-02 2021-04-16 首佳优品(北京)国际农业科技有限公司 Powder for high-quality tomatoes and preparation method and using method thereof
CN111646839A (en) * 2020-05-21 2020-09-11 河南捷农生化有限公司 Humic acid compound fertilizer and preparation method thereof
CN115997541A (en) * 2023-02-19 2023-04-25 贵州省园艺研究所(贵州省园艺工程技术研究中心) Application method of fertilizer suitable for full growth period of wire peppers
CN117925249B (en) * 2024-01-22 2024-07-02 西藏泰晟环保工程有限公司 Improved material for saline-alkali soil and preparation method thereof

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