Coated slow-release fertilizer based on humic acid material-medium and trace element chelate, and preparation method and application thereof
A medium-trace element, coated and slow-release technology, applied in layered/coated fertilizers, organic fertilizers, urea compound fertilizers, etc., can solve problems such as not easy to degrade
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[0070] The preparation method of the present invention will be further described in detail in conjunction with specific examples below. It should be understood that the following examples are only for illustrating and explaining the present invention, and should not be construed as limiting the protection scope of the present invention. All technologies realized based on the above contents of the present invention are covered within the scope of protection intended by the present invention.
[0071] The experimental methods used in the following examples are conventional methods unless otherwise specified; the reagents and materials used in the following examples can be obtained from commercial sources unless otherwise specified.
Embodiment 1
[0073] The present embodiment provides a kind of coated slow-release fertilizer based on potassium fulvic acid chelated iron element, which is obtained by the following preparation method:
[0074] In the first step, take 500g of granular urea (with a particle size of 1.18mm-3.35mm) and preheat it to 44°C to 48°C, and dissolve potassium fulvate in water to prepare a potassium fulvate solution with a concentration of 15mg / mL. According to the molar ratio of spraying materials 1:1 (the molar ratio of potassium fulvic acid to iron element), ferric chloride hexahydrate solution was prepared, and the binder zein was dissolved in high-concentration urea solution (0.04g / mL) to prepare Prepare a solution with a concentration of 0.04g / mL; take polyvinylpyrrolidone to make an aqueous solution with a concentration of 0.01g / mL, and take sodium hydroxide to prepare a weak alkaline aqueous solution with a pH ≈ 8.
[0075] In the second step, use the image 3In the device shown, the configu...
Embodiment 2
[0079] The present embodiment provides a kind of coated slow-release fertilizer based on potassium fulvic acid chelated iron element, which is obtained by the following preparation method:
[0080] In the first step, take 500g of compound fertilizer or compound fertilizer granules (particle size 2mm-3mm) and preheat it to 44°C to 48°C, and dissolve potassium fulvate in water to prepare potassium fulvate with a concentration of 15mg / mL Solution, prepare ferric chloride hexahydrate solution according to the molar ratio of the spraying material 1:1 (the molar ratio of potassium fulvic acid to iron element), take the binder zein and dissolve it in a high-concentration urea solution (0.04g / mL ) to a prolamin solution with a concentration of 0.04g / mL; polyvinylpyrrolidone to make an aqueous solution with a concentration of 0.01g / mL; sodium hydroxide to prepare a weak alkaline aqueous solution with pH ≈ 8.
[0081] In the second step, spray the configured potassium fulvic acid soluti...
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