Alkaline compound liquid fertilizer containing lignin-based long-acting nitrogen fertilizer, preparation method and application thereof
A compound liquid, lignin-based technology, applied in the field of fertilizers, can solve the problems of inability to directly use as slow-release nitrogen fertilizer, poor soil pH, low nitrogen content, etc., achieve excellent uniformity and stability, improve utilization value, The effect of high fertilizer utilization rate
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Embodiment 1
[0067] A preparation method of an alkaline compound liquid fertilizer containing lignin-based long-acting nitrogen fertilizer, the steps of which are:
[0068] Under continuous stirring, firstly, 5 g of phenolized lignin was fully dissolved in 10 mL of 0.4 mol / L potassium hydroxide solution. Next, 15g of ethylenediamine and 20g of formaldehyde solution were sequentially added to the above solution. Finally, the above mixture was placed in a microwave reactor (400W, the same below) to react at 80° C. for 40 minutes, and a solution containing lignin long-acting nitrogen fertilizer was obtained after the reaction was completed.
[0069] Such as figure 1 , is the infrared spectrogram (MPL) of the lignin long-acting nitrogen fertilizer. It can be seen from the figure that N is effectively inserted into the prepared lignin long-acting nitrogen fertilizer. The mass concentration of lignin in the solution is 29g / L, and the content of organic nitrogen in the lignin is 7.2%.
[0070]...
Embodiment 2
[0073] A preparation method of an alkaline compound liquid fertilizer containing lignin-based long-acting nitrogen fertilizer, the steps of which are:
[0074] Under continuous stirring, firstly, 5 g of phenolized lignin was fully dissolved in 10 mL of 0.4 mol / L potassium hydroxide solution. Next, 20 g of ethylenediamine and 20 g of formaldehyde solution were sequentially added to the above solution. Finally, the above mixture was placed in a microwave reactor to react at 80° C. for 25 minutes, and a solution containing lignin long-acting nitrogen fertilizer was obtained after the reaction.
[0075] The lignin mass concentration of the solution is 28g / L, and the content of organic nitrogen in the lignin is 7.0%.
[0076] Take 800 mL of the above solution, add 50.7 g of potassium nitrate, 230 g of potassium dihydrogen phosphate and 4.4 g of potassium chloride, and then dilute the solution to 1 L with distilled water. Finally, adjust the pH of the solution to be 7.5, namely th...
Embodiment 3
[0079] A preparation method of an alkaline compound liquid fertilizer containing lignin-based long-acting nitrogen fertilizer, the steps of which are:
[0080] Under continuous stirring, firstly, 5 g of phenolized lignin was fully dissolved in 10 mL of 0.4 mol / L potassium hydroxide solution. Next, 10 g of ethylenediamine and 20 g of formaldehyde solution were sequentially added to the above solution. Finally, the above mixture was placed in a microwave reactor to react at 80° C. for 25 minutes, and a solution containing lignin long-acting nitrogen fertilizer was obtained after the reaction.
[0081] The mass concentration of lignin in the solution is 25g / L, and the content of organic nitrogen in the lignin is 6.3%.
[0082] Take 800 mL of the above solution, add 72.5 g of potassium nitrate and 230 g of potassium dihydrogen phosphate, and then dilute the solution to 1 L with distilled water. Finally, adjust the pH of the solution to be 7.5, i.e. the alkaline compound liquid f...
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