CN103483044B - Calcium-rich organic liquid fertilizer and preparation method thereof - Google Patents
Calcium-rich organic liquid fertilizer and preparation method thereof Download PDFInfo
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- CN103483044B CN103483044B CN201310428181.3A CN201310428181A CN103483044B CN 103483044 B CN103483044 B CN 103483044B CN 201310428181 A CN201310428181 A CN 201310428181A CN 103483044 B CN103483044 B CN 103483044B
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Abstract
The invention provides a calcium-rich organic liquid fertilizer which comprises the following compositions: 20-40% of a chelated calcium solution, 10-30% of a chelated iron solution, 10-20% of a urea solution, and 20-30% of water. The invention further provides a preparation method for the calcium-rich organic liquid fertilizer. According to the calcium-rich organic liquid fertilizer, provided by the invention, the calcium-rich organic liquid fertilizer added with iron and nitrogen is prepared by adopting the preparation method based on certain improvement and aiming at the problems and defects existing in the prior art, the paddy rice yield is greatly improved, the absorption and utilization of calcium and other elements are facilitated, the content of organic calcium in rice is increased, the rice quality is improved, and besides, the calcium-rich organic liquid fertilizer has the advantages of safety, non-pollution, relatively simple preparation method, low cost and the like.
Description
Technical field
The invention belongs to organic liquid calcareous fertilisers field, particularly produce rich calcium organic fertilizer of paddy rice and preparation method thereof.
Background technology
Calcium has the good reputation of human body " bioelement ", and be the abundantest inorganic elements of body burden, total amount is more than 1kg.Calcium is most important to human body, is not only related to bone health, and may be relevant with hypertension, premenstrual tension syndrome etc.Calcium ion has the biopotential maintaining cytolemma both sides, maintains normal Nerve conduction, maintains normal muscle and stretches and diastolic function and nerve-muscle conduction function, also has some functions of hormones mechanism all to be showed by calcium ion.
The 8-12 month in 2002, taken the lead by the Ministry of Health, the Department of Science and Technology and State Statistics Bureau, investigation total 270,000 people, urban and urual areas of whole country's calcium intake is only 391mg per capita, is equivalent to 41% of recommended intake.Particularly along with the average expected life-span extends, the elderly gets more and more, and osteoporotic harm will be more and more outstanding.Improving the content of calcium in rice by applying calcareous fertilisers, to improve calcium intake per capita, is a kind of effective way of prevention senile osteoporosis.
At present, the calcareous fertilisers of domestic production mainly contain inorganic mixing calcareous fertilisers and organic liquid calcareous fertilisers two kinds, and inorganic mixing calcareous fertilisers are the methods by calcareous fertilisers bottom application, reach the object of Crop calcium, because the trace element fertilizers such as calcium are easily by soil fixing, directly affect the content of calcium in the absorption of calcium and product; Another kind is the method by foliage-spray organic liquid calcareous fertilisers, although root outer spraying is most economical effective fertilizing method, the calcium agent sprayed is simple, it is single to fill a prescription, and is often unfavorable for the absorption promoting calcium, and the calcium utilization sprayed, security are lower.
Summary of the invention
Goal of the invention: first object of the present invention is to provide a kind of rich calcium organic fertilizer.Second object of the present invention is to provide the preparation method of this rich calcium organic fertilizer.
Technical scheme: the invention provides a kind of rich calcium organic fertilizer, be made up of following component by weight percentage: chelating calcium solution 20% ~ 40%, chelated iron solution 10% ~ 30%, urea soln 10% ~ 20%, water 20% ~ 30%.
Described chelating calcium solution concentration range is 5 × 10
-4mol/L ~ 17 × 10
-4mol/L, described chelated iron solution concentration range is 3 × 10
-4mol/L ~ 10 × 10
-4mol/L, described urea concentration scope is 2 × 10
-3mol/L ~ 6 × 10
-3mol/L.
Preferably, described chelating calcium solution concentration is 9 × 10
-4mol/L, described chelated iron solution concentration is 6 × 10
-4mol/L, described urea concentration is 4 × 10
-3mol/L.
Preferably, described chelating calcium solution concentration is 13 × 10
-4mol/L, described chelated iron solution concentration is 8 × 10
-4mol/L, described urea concentration is 5 × 10
-3mol/L.
The preparation method of above-mentioned rich calcium organic fertilizer, comprises the following steps:
(1) chelating calcium solution is prepared: from Double-low Rape Seed grouts, extract amino acid, the amino acid extracted is mixed by a mole ratio range 2:1.5 ~ 3:1.5 with calcium carbonate, adjust ph 6.5 ~ 8.5, at normal pressure, carries out chelatropic reaction 1 ~ 5h at temperature 60 ~ 80 DEG C;
(2) chelated iron solution is prepared: from Double-low Rape Seed grouts, extract amino acid, the amino acid extracted is mixed by a mole ratio range 4:1.5 ~ 6:1.5 with ferrous sulfate, adjust ph 4.5 ~ 6.5, at normal pressure, carries out chelatropic reaction 1 ~ 4h at temperature 35 ~ 60 DEG C;
(3) urea is got and water prepares 2 × 10 at normal temperatures and pressures
-3mol/L ~ 6 × 10
-3mol/L urea soln;
(4) the chelating calcium solution described in step 1 ~ 3, chelated iron solution, urea soln are mixed with water by above-mentioned proportioning, under normal temperature and pressure, be uniformly mixed more than 1h.
Extract amino acid in Double-low Rape Seed grouts in described step (1) and step (2) to comprise the steps:
A) take Double-low Rape Seed grouts 10g, serine protease 0.15g, add distilled water, be made into 200mL mixed solution;
B) hydro-oxidation sodium regulates pH to be 7.5, acts on 15h and take out in water bath;
C) be heated to more than 100 DEG C, deactivation suction filtration 8min, obtain Double-low Rape Seed grouts hydrolyzed solution and namely obtain amino acid.
In described step (1), the mol ratio of amino acid and calcium carbonate is 2.5:1.5, and adjust ph 7.5, at normal pressure, carries out chelatropic reaction 3.5h and obtain chelating calcium solution under temperature 70 C.
In described step (2), the mol ratio of amino acid and ferrous sulfate is 5:1.5, and pH value 5.5, at normal pressure, carries out chelatropic reaction 2.5h and obtain chelated iron solution under temperature 45 C.
Beneficial effect:
1) using by rich calcium organic fertilizer of the present invention, improves the content of organic calcium in rice, can reach 135 ~ 185mg/kg, and the calcium content of general rice is only at 70 ~ 100mg/kg, thus improves the quality of rice;
2) using by rich calcium organic fertilizer of the present invention, can increase substantially rice yield, and thousand seed weight increases by 1 ~ 1.5g, and paddy rice on average increases production 50 ~ 75kg/ mu.Compared with not spraying the paddy rice of rich calcium organic fertilizer, the paddy rice anti contravariance spraying rich calcium organic fertilizer in conventional cultivation Cultivate administration process is strong, leaf color depth, blade are thick, straight and upright, particularly last three functional leaf chlorophyll contents are high, photosynthesis is strong, when paddy rice is ripe, the blue or green seed of stalk is yellow, and output increases substantially.
3) in rich calcium organic fertilizer of the present invention, because adding the interaction of iron nitrogen, to serve between element effect that is complementary, superposition, facilitating absorbing of calcium and other elements;
4) features such as this rich calcium organic fertilizer has safe, pollution-free, and preparation method is relatively simple, cost is low.
5) preparation method of rich calcium organic fertilizer provided by the invention, technique is simple, easy to operate, is suitable for suitability for industrialized production.
Embodiment
According to following embodiment, the present invention may be better understood.But those skilled in the art will readily understand, concrete material proportion, processing condition and result thereof described by embodiment only for illustration of the present invention, and should can not limit the present invention described in detail in claims yet.
Embodiment 1
A kind of rich calcium organic fertilizer, is made up of following component: chelating calcium solution 20%, chelated iron solution 30%, urea soln 20%, water 30% by weight percentage.Described chelating calcium solution concentration is 5 × 10
-4mol/L, described chelated iron solution concentration is 3 × 10
-4mol/L, described urea concentration is 2 × 10
-3mol/L.
A preparation method for rich calcium organic fertilizer, comprises the following steps:
(1) prepare chelating calcium solution: from Double-low Rape Seed grouts, extract amino acid, mixed by a mole ratio range 3:1.5 with calcium carbonate by the amino acid extracted, adjust ph 6.5, at normal pressure, carries out chelatropic reaction 1h under temperature 60 C;
(2) prepare chelated iron solution: from Double-low Rape Seed grouts, extract amino acid, mixed by a mole ratio range 4:1.5 with ferrous sulfate by the amino acid extracted, adjust ph 4.5, at normal pressure, carries out chelatropic reaction 1h at temperature 35 DEG C;
(3) urea is got and water prepares 2 × 10 at normal temperatures and pressures
-3mol/L urea soln;
(4) the chelating calcium solution described in step 1 ~ 3, chelated iron solution, urea soln are mixed with water by described proportioning, under normal temperature and pressure, be uniformly mixed more than 1h.
Extract amino acid in Double-low Rape Seed grouts in described step (1) and step (2) to comprise the steps:
A), take Double-low Rape Seed grouts 10g, serine protease 0.15g, add distilled water, be made into 200mL mixed solution;
B), hydro-oxidation sodium regulate pH be 7.5, act in water bath 15h take out;
C), be heated to more than 100 DEG C, deactivation suction filtration 8min, obtain Double-low Rape Seed grouts hydrolyzed solution and namely obtain amino acid.
Field test place: experimental plot, No. 1, Jurong City.
For examination rice varieties: town rice No. 10.
Plan design: conventional cultivation with spray above-mentioned rich calcium organic fertilizer two kinds of processing modes.
In the present embodiment, the conventional cultivation method of paddy rice is seed selection, seedling, cultivated whole field, rice transplanting, field management, harvesting.
In the present embodiment, paddy rice sprays the production method of rich calcium organic fertilizer:
(1) first time uses: ear period in paddy rice 40 ~ 60%, gets the rich calcium organic fertilizer of above-mentioned formula 500mL, is dissolved in 50kg water, after fully mixing, sprays once rich calcium organic fertilizer to rice leaf.
(2) second time is used: get the rich calcium organic fertilizer of above-mentioned formula 500mL again, be dissolved in 50kg water, after fully mixing, at the rich calcium organic fertilizer of rice milking stage initial stage second time foliage-spray.
Test-results:
| Process | Output (kg/ mu) | Calcium contents (mg/kg) |
| Do not spray (general planting) | 545 | 72 |
| Spray the rich calcium solution of the present invention | 595 | 138 |
Embodiment 2
A kind of rich calcium organic fertilizer, is made up of following component: chelating calcium solution 30%, chelated iron solution 30%, urea soln 10%, water 30% by weight percentage.Described chelating calcium solution concentration is 9 × 10
-4mol/L, described chelated iron solution concentration is 6 × 10
-4mol/L, described urea concentration is 4 × 10
-3mol/L.
A preparation method for rich calcium organic fertilizer, comprises the following steps:
(1) prepare chelating calcium solution: from Double-low Rape Seed grouts, extract amino acid, mixed by a mole ratio range 2:1.5 with calcium carbonate by the amino acid extracted, adjust ph 8.5, at normal pressure, carries out chelatropic reaction 5h at temperature 80 DEG C;
(2) prepare chelated iron solution: from Double-low Rape Seed grouts, extract amino acid, mixed by a mole ratio range 6:1.5 with ferrous sulfate by the amino acid extracted, adjust ph 4.5, at normal pressure, carries out chelatropic reaction 4h under temperature 60 C;
(3) urea is got and water prepares 4 × 10 at normal temperatures and pressures
-3mol/L urea soln;
(4) the chelating calcium solution described in step 1 ~ 3, chelated iron solution, urea soln are mixed with water by described proportioning, under normal temperature and pressure, be uniformly mixed more than 1h.
Extract amino acid in Double-low Rape Seed grouts in described step (1) and step (2) to comprise the steps:
A), take Double-low Rape Seed grouts 10g, serine protease 0.15g, add distilled water, be made into 200mL mixed solution;
B), hydro-oxidation sodium regulate pH be 7.5, act in water bath 15h take out;
C), be heated to more than 100 DEG C, deactivation suction filtration 8min, obtain Double-low Rape Seed grouts hydrolyzed solution and namely obtain amino acid.
Field test place: experimental plot, No. 2, Jurong City.
For examination rice varieties: town rice No. 11.
Plan design: conventional cultivation with spray above-mentioned rich calcium organic fertilizer two kinds of processing modes.
In the present embodiment, the conventional cultivation method of paddy rice is seed selection, seedling, cultivated whole field, rice transplanting, field management, harvesting.
In the present embodiment, paddy rice sprays the production method of rich calcium organic fertilizer:
(1) first time uses: ear period in paddy rice 40 ~ 60%, gets the rich calcium organic fertilizer of above-mentioned formula 500mL, is dissolved in 50kg water, after fully mixing, sprays once rich calcium organic fertilizer to rice leaf.
(2) second time is used: get the rich calcium organic fertilizer of above-mentioned formula 500mL again, be dissolved in 50kg water, after fully mixing, at the rich calcium organic fertilizer of rice milking stage initial stage second time foliage-spray.
Test-results:
| Process | Output (kg/ mu) | Calcium contents (mg/kg) |
| Do not spray (general planting) | 546 | 84 |
| Spray the rich calcium solution of the present invention | 610 | 169 |
Embodiment 3:
A kind of rich calcium organic fertilizer, is made up of following component: chelating calcium solution 40%, chelated iron solution 20%, urea soln 20%, water 20% by weight percentage.Described chelating calcium solution concentration is 13 × 10
-4mol/L, described chelated iron solution concentration is 8 × 10
-4mol/L, described urea concentration is 5 × 10
-3mol/L.
A preparation method for rich calcium organic fertilizer, comprises the following steps:
(1) prepare chelating calcium solution: from Double-low Rape Seed grouts, extract amino acid, mixed by a mole ratio range 2.5:1.5 with calcium carbonate by the amino acid extracted, adjust ph 7.5, at normal pressure, carries out chelatropic reaction 3.5h under temperature 70 C;
(2) prepare chelated iron solution: from Double-low Rape Seed grouts, extract amino acid, mixed by a mole ratio range 5:1.5 with ferrous sulfate by the amino acid extracted, adjust ph 5.5, at normal pressure, carries out chelatropic reaction 2.5h under temperature 45 C;
(3) urea is got and water prepares 5 × 10 at normal temperatures and pressures
-3mol/L urea soln;
(4) the chelating calcium solution described in step 1 ~ 3, chelated iron solution, urea soln are mixed with water by described proportioning, under normal temperature and pressure, be uniformly mixed more than 1h.
Extract amino acid in Double-low Rape Seed grouts in described step (1) and step (2) to comprise the steps:
A), take Double-low Rape Seed grouts 10g, serine protease 0.15g, add distilled water, be made into 200mL mixed solution;
B), hydro-oxidation sodium regulate pH be 7.5, act in water bath 15h take out;
C), be heated to more than 100 DEG C, deactivation suction filtration 8min, obtain Double-low Rape Seed grouts hydrolyzed solution and namely obtain amino acid.
Field test place: experimental plot, No. 3, Jurong City.
For examination rice varieties: military fortune round-grained rice 23.
Plan design: conventional cultivation with spray above-mentioned rich calcium organic fertilizer two kinds of processing modes.
In the present embodiment, the conventional cultivation method of paddy rice is seed selection, seedling, cultivated whole field, rice transplanting, field management, harvesting.
In the present embodiment, paddy rice sprays the production method of rich calcium organic fertilizer:
(1) first time uses: ear period in paddy rice 40 ~ 60%, gets the rich calcium organic fertilizer of above-mentioned formula 500mL, is dissolved in 50kg water, after fully mixing, sprays once rich calcium organic fertilizer to rice leaf.
(2) second time is used: get the rich calcium organic fertilizer of above-mentioned formula 500mL again, be dissolved in 50kg water, after fully mixing, at the rich calcium organic fertilizer of rice milking stage initial stage second time foliage-spray.
Test-results:
| Process | Output (kg/ mu) | Calcium contents (mg/kg) |
| Do not spray (general planting) | 563 | 87 |
| Spray the rich calcium solution of the present invention | 635 | 176 |
Embodiment 4:
A kind of rich calcium organic fertilizer, is made up of following component: chelating calcium solution 30%, chelated iron solution 20%, urea soln 20%, water 30% by weight percentage.Described chelating calcium solution concentration is 17 × 10
-4mol/L, described chelated iron solution concentration is 10 × 10
-4mol/L, described urea concentration is 6 × 10
-3mol/L.
A preparation method for rich calcium organic fertilizer, comprises the following steps:
(1) prepare chelating calcium solution: from Double-low Rape Seed grouts, extract amino acid, mixed by a mole ratio range 3:1.5 with calcium carbonate by the amino acid extracted, adjust ph 7, at normal pressure, carries out chelatropic reaction 3h at temperature 75 DEG C;
(2) prepare chelated iron solution: from Double-low Rape Seed grouts, extract amino acid, mixed by a mole ratio range 4.5:1.5 with ferrous sulfate by the amino acid extracted, adjust ph 6, at normal pressure, carries out chelatropic reaction 3h under temperature 50 C;
(3) urea is got and water prepares 6 × 10 at normal temperatures and pressures
-3mol/L urea soln;
(4) the chelating calcium solution described in step 1 ~ 3, chelated iron solution, urea soln are mixed with water by described proportioning, under normal temperature and pressure, be uniformly mixed more than 1h.
Extract amino acid in Double-low Rape Seed grouts in described step (1) and step (2) to comprise the steps:
A), take Double-low Rape Seed grouts 10g, serine protease 0.15g, add distilled water, be made into 200mL mixed solution;
B), hydro-oxidation sodium regulate pH be 7.5, act in water bath 15h take out;
C), be heated to more than 100 DEG C, deactivation suction filtration 8min, obtain Double-low Rape Seed grouts hydrolyzed solution and namely obtain amino acid.
Field test place: experimental plot, No. 4, Jurong City.
For examination rice varieties: town rice No. 18.
Plan design: conventional cultivation with spray rich calcium organic fertilizer two and process.
In the present embodiment, the conventional cultivation method of paddy rice is seed selection, seedling, cultivated whole field, rice transplanting, field management, harvesting.
In the present embodiment, paddy rice sprays the production method of rich calcium organic fertilizer:
(1) first time uses: ear period in paddy rice 40 ~ 60%, gets the rich calcium organic fertilizer of above-mentioned formula 500mL, is dissolved in 50kg water, after fully mixing, sprays once rich calcium organic fertilizer to rice leaf.
(2) second time is used: get the rich calcium organic fertilizer of above-mentioned formula 500mL again, be dissolved in 50kg water, after fully mixing, at the rich calcium organic fertilizer of rice milking stage initial stage second time foliage-spray.
Test-results:
| Process | Output (kg/ mu) | Calcium contents (mg/kg) |
| Do not spray (general planting) | 554 | 85 |
| Spray the rich calcium solution of the present invention | 616 | 158 |
Embodiment 5
A kind of rich calcium organic fertilizer, is made up of following component: chelating calcium solution 40%, chelated iron solution 10%, urea soln 20%, water 30% by weight percentage.Described chelating calcium solution concentration is 11 × 10
-4mol/L, described chelated iron solution concentration is 6.5 × 10
-4mol/L, described urea concentration is 3 × 10
-3mol/L.
A preparation method for rich calcium organic fertilizer, comprises the following steps:
(1) prepare chelating calcium solution: from Double-low Rape Seed grouts, extract amino acid, mixed by a mole ratio range 2:1.5 with calcium carbonate by the amino acid extracted, adjust ph 7, at normal pressure, carries out chelatropic reaction 4h at temperature 65 DEG C;
(2) prepare chelated iron solution: from Double-low Rape Seed grouts, extract amino acid, mixed by a mole ratio range 5.5:1.5 with ferrous sulfate by the amino acid extracted, adjust ph 5, at normal pressure, carries out chelatropic reaction 2h at temperature 55 DEG C;
(3) urea is got and water prepares 3 × 10 at normal temperatures and pressures
-3mol/L urea soln;
(4) the chelating calcium solution described in step 1 ~ 3, chelated iron solution, urea soln are mixed with water by described proportioning, under normal temperature and pressure, be uniformly mixed more than 1h.
Extract amino acid in Double-low Rape Seed grouts in described step (1) and step (2) to comprise the steps:
A), take Double-low Rape Seed grouts 10g, serine protease 0.15g, add distilled water, be made into 200mL mixed solution;
B), hydro-oxidation sodium regulate pH be 7.5, act in water bath 15h take out;
C), be heated to more than 100 DEG C, deactivation suction filtration 8min, obtain Double-low Rape Seed grouts hydrolyzed solution and namely obtain amino acid.
Field test place: experimental plot, No. 5, Jurong City.
For examination rice varieties: town rice No. 18.
Plan design: conventional cultivation with spray rich calcium organic fertilizer two and process.
In the present embodiment, the conventional cultivation method of paddy rice is seed selection, seedling, cultivated whole field, rice transplanting, field management, harvesting.
In the present embodiment, paddy rice sprays the production method of rich calcium organic fertilizer:
(1) first time uses: ear period in paddy rice 40 ~ 60%, gets the rich calcium organic fertilizer of above-mentioned formula 500mL, is dissolved in 50kg water, after fully mixing, sprays once rich calcium organic fertilizer to rice leaf.
(2) second time is used: get the rich calcium organic fertilizer of above-mentioned formula 500mL again, be dissolved in 50kg water, after fully mixing, at the rich calcium organic fertilizer of rice milking stage initial stage second time foliage-spray.
Test-results:
| Process | Output (kg/ mu) | Calcium contents (mg/kg) |
| Do not spray (general planting) | 561 | 89 |
| Spray the rich calcium solution of the present invention | 636 | 164 |
Claims (3)
1. a preparation method for rich calcium organic fertilizer, is characterized in that, comprise the following steps:
(1) chelating calcium solution is prepared: from Double-low Rape Seed grouts, extract amino acid, the amino acid extracted is mixed by a mole ratio range 2:1.5 ~ 3:1.5 with calcium carbonate, adjust ph 6.5 ~ 8.5, at normal pressure, carries out chelatropic reaction 1 ~ 5 h at temperature 60 ~ 80 DEG C;
(2) chelated iron solution is prepared: from Double-low Rape Seed grouts, extract amino acid, the amino acid extracted is mixed by a mole ratio range 4:1.5 ~ 6:1.5 with ferrous sulfate, adjust ph 4.5 ~ 6.5, at normal pressure, carries out chelatropic reaction 1 ~ 4 h at temperature 35 ~ 60 DEG C;
(3) urea is got and water prepares 2 × 10 at normal temperatures and pressures
-3mol/L ~ 6 × 10
-3mol/L urea soln;
(4) chelating calcium solution, chelated iron solution, urea soln are mixed with water by following proportioning, under normal temperature and pressure, be uniformly mixed 1 more than h; Wherein, be made up of following component by weight percentage: chelating calcium solution 20% ~ 40%, chelated iron solution 10% ~ 30%, urea soln 10% ~ 20%, water 20% ~ 30%; Described chelating calcium solution concentration range is 5 × 10
-4mol/L ~ 17 × 10
-4mol/L, described chelated iron solution concentration range is 3 × 10
-4mol/L ~ 10 × 10
-4mol/L, described urea concentration scope is 2 × 10
-3mol/L ~ 6 × 10
-3mol/L;
Wherein, extract amino acid in Double-low Rape Seed grouts in described step (1) and step (2) to comprise the steps:
Take Double-low Rape Seed grouts 10 g, serine protease 0.15 g, add distilled water, be made into 200 mL mixed solutions;
Hydro-oxidation sodium regulates pH to be 7.5, acts on 15 h and take out in water bath;
Be heated to more than 100 DEG C, deactivation suction filtration 8 min, obtain Double-low Rape Seed grouts hydrolyzed solution and namely obtain amino acid.
2. method according to claim 1, is characterized in that, in described step (1), the mol ratio of amino acid and calcium carbonate is 2.5:1.5, and adjust ph 7.5, at normal pressure, carries out chelatropic reaction 3.5 h and obtain chelating calcium solution under temperature 70 C.
3. method according to claim 1, is characterized in that, in described step (2), the mol ratio of amino acid and ferrous sulfate is 5:1.5, and pH value 5.5, at normal pressure, carries out chelatropic reaction 2.5 h and obtain chelated iron solution under temperature 45 C.
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| CN101050134A (en) * | 2007-05-18 | 2007-10-10 | 吴礼树 | Fertilizer of chelated calcium, and preparation method |
| CN101973802B (en) * | 2010-09-29 | 2011-08-10 | 菏泽金正大生态工程有限公司 | Nutrition package feed of deciduous fruit trees, preparation and application thereof |
| CN102718592A (en) * | 2011-03-29 | 2012-10-10 | 訾兆举 | Production method for dual acid chelate inorganic compound fertilizer |
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