Preparation method of selenium-rich controlled-release nitrogen fertilizer
A nitrogen fertilizer and selenium-enriched technology, applied in fertilization devices, fertilizer mixtures, applications, etc., to achieve the effects of increasing production costs, increasing crop yields and product selenium content, and uniform application
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Embodiment 1
[0045] Embodiment 1: the preparation method of selenium-enriched controlled-release nitrogen fertilizer, the steps are as follows:
[0046] (1) Preparation of selenium-containing potassium fulvic acid coated urea
[0047] Get 0.15 kilograms of sodium selenate and dissolve it in 15 kilograms of water, spray this solution on 100 kilograms of potassium fulvic acid, stir evenly while spraying, place it at room temperature for 5 hours, and dry it under 65°C to obtain selenium-containing fulvic acid. Potassium acid, spare;
[0048] Get 10 kilograms of bisphenol A and 1.2 kilograms of triethylenetetramine, and mix the two evenly to obtain a binder;
[0049] Take 100 kg of granular urea with a particle size of 2 to 3 mm and put it into a drum to preheat to 65 ° C, spray 0.4 kg of the prepared binder onto the rotating urea particles, and then spray the prepared selenium yellow Potassium humate 2.0 kg, to obtain selenium-containing potassium fulvic acid coated urea I;
[0050] Take ano...
Embodiment 2
[0055] (1) Preparation of selenium-containing potassium fulvic acid coated urea
[0056] Get 0.17 kilograms of sodium selenate and dissolve it in 17 kilograms of water, spray this solution on 100 kilograms of potassium fulvic acid, stir evenly while spraying, place it at room temperature for 8 hours, and dry it under 65°C to obtain selenium-containing fulvic acid. Potassium acid, spare;
[0057] Get 10 kilograms of bisphenol A and 1.4 kilograms of triethylenetetramine, and mix the two evenly to obtain a binder;
[0058] The preparation of the coated urea I containing potassium fulvic acid selenium, the coated urea II containing potassium fulvic acid selenium and the coated urea III containing potassium fulvic acid selenium are the same as in Example 1.
[0059] (2) Compounding
[0060] According to the mass ratio of 1:2:1, three kinds of coated urea I containing potassium fulvate containing selenium, coated urea II containing potassium fulvic acid II and coated urea III cont...
Embodiment 3
[0062] (1) Preparation of selenium-containing potassium fulvic acid coated urea
[0063] Get 0.20 kilogram of sodium selenate and dissolve it in 20 kilograms of water, spray this solution on 100 kilograms of potassium fulvic acid, stir evenly while spraying, place it at room temperature for 6 hours, and dry it under 65°C to obtain selenium-containing fulvic acid. Potassium acid potassium, for subsequent use; Get 10 kilograms of bisphenol A, 1.3 kilograms of triethylenetetramines, both are mixed uniformly, obtain binding agent;
[0064] The preparation of the coated urea I containing potassium fulvic acid selenium, the coated urea II containing potassium fulvic acid selenium and the coated urea III containing potassium fulvic acid selenium are the same as in Example 1.
[0065] (2) Compounding
[0066] According to the mass ratio of 1:2:2, three kinds of coated urea I containing potassium fulvate containing selenium, coated urea II containing potassium fulvic acid II and coate...
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