SU1198049A1 - Method of producing nitrogen fertillizer - Google Patents

Abstract

METHOD OF OBTAINING NITROGEN FERTILIZERS by treating fertilizer granules with nitrification inhibitors, characterized in that, in order to reduce the rate of nitrification, melt 1 -carbamoyl-3 is used as a nitrification inhibitor

Description

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The invention relates to the production of mineral fertilizers and can be used to obtain nitrogen fertilizer containing ammonium nitrogen nitrification inhibitors and having a reduced leachability from the soil.

The purpose of the invention is to reduce the speed of nitrids AI.

Example 1. In a 500 ml vessel, 5.00 g of air-dry soil is placed, 200 mg of urea and 2.0 mg of CMP are added. Then the soil is moistened to 60% of its full capacity and held at the thermostat at. After keeping the sample for 14 days, the degree of nitrification is determined by determining the content of nitrate and ammonium nitrogen.

KMP - 1-carbomoyl-3 (5) -methylpyrazole.

Examples 2-5. Differ from Example 1 in that, instead of CMP, inhibitors of nitrification of CGP, H-server, ATC, and DCDA are taken.

Example 6. 500 grams of granulated carbamide are poured into the drum and a curtain is created from it while the drum is rotating. On the fertilizer curtain from the melter with a mechanical nozzle serves 10 g of the CMP, dissolved in the melt 490 g of urea. The resulting fertilizer is applied to the soil, after 14 days the content of nitrate and ammonium nitrogen is determined, as shown in Example 1.

Examples 7-10. From example 6, it is different. Instead of KMP, I take inhibitors of CGP nitrification, H-servo PBX and LITCH.

CGP - N- (6-chlorohexyl) -1-carbamate-3 (5) -methylpyrazole.

H-serv-2-chloro-6-trichloromethylpyrimidine.

D1Shcha - dicyandiamide.

ATC - 4-amino-1,2,4-triazole ..

Example 11. 990 g of granulated carbamide are poured into the drum and a curtain is made of it when the drum rotates. On the fertilizer curtain from the melter with a mechanical nozzle serves 10 g of the melt inhibitor nitrification KMP. Received

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The fertilizer is applied to the soil, after 14 days the content of nitrate and ammonium nitrogen is determined, as shown in Example 1.

J Examples 12-15. From example 11, they are distinguished by the fact that instead of CMP, inhibitors of nitrification of CGP, H-serv,, ATC and DCDA are taken.

The table shows that .inhibitors

0 nitrification of CMP, CGP, H-serv and ATC with separate application of inhibitor and carbamide in the soil exhibit the same efficiency, DCCA at a concentration of 1.0% of fertilizer is less active.

Unlike ATC and DCDA, CML and CGP and H-serv, when carbamide is introduced into the melt in order to obtain a fertilizer in which the inhibitor

20 is distributed over the entire mass of granules, sharply loses its activity, as a result of which the degree of nitrification, as shown by the example of the CMP, increases from 14.4 to 31.0 per sandy loam

5 to soil and from 5.2 to 20.4 on clay, which in molten carbamide CMPs decompose to 3 (5) -methylpyrazole.

From the data presented in the table, it can be seen that the inhibiting of the active asset, the q of the ATC and the RCA are maintained at the same level regardless of the method of introducing the nitrification inhibitors into the soil.

For an H-server, the most appropriate method is the separate addition of the inhibitor and urea.

Bringing the nitricification inhibitors of CMP and CGP to the carbamide granules as a melt, the degree of nitrification drops sharply compared with the two other routes of administration.

This phenomenon can be explained by the fact that, in addition to the inhibitory effect, because of the very poor solubility in water, CMP or CPG on the surface of the granules create an additional effect of a slow-acting fertilizer. This effect is not produced when ATC and DCCA are applied to carbamide granules due to their good solubility in water. Due to the abnormal volatility of Nerve, the effect of a slow-acting fertilizer is also lost.

Separate introduction of the inhibitor nitrification and urea

The nitrification inhibitor of the proposed method is preferably introduced in an amount of 1.0-1.5% relative to the weight of the fertilizer.

Increasing the amount of nitrification inhibitor above 1.5% does not lead to a further decrease in the degree of nitrification of nitrogen. With a decrease in the amount of inhibitor below 1%, the degree of nitrification sharply increases, which is apparently due to an insufficient amount of inhibitor. The effect of the inhibitor content on the nitrification process is shown in the table.

In the proposed method, the application of inhibitors from the class of α-derivatives of 3 (5) -methylpyrazole on the surface of the fertilizer results in the resulting fertilizer having a new property — the ability to undergo a slower process and nitrification than with the introduction of the inhibitor into the mass of fertilizer or with separate application of the fertilizer and inhibitor into the soil. This property is caused by a combination of the chemical nature of this class of inhibitors and the method of applying them to the surface of the granules. The application of other nitrifying inhibitors (H-server, dicyandiamide, 4-amino-1,2,4-triazole) on the surface of fertilizer granules not only does not lead to the appearance of this property, but, on the contrary, reduces the effectiveness of inhibitors compared to other methods of fertilizer and / or soil application.

The process of applying inhibitors to fertilizer granules is described in the examples. In this case, fertilizer granules are introduced into the drum at ambient temperature, and the inhibitor is heated in a separate apparatus to a temperature somewhat

its melting temperature, which is for CML, for CGP. The inhibitor melt is introduced into the drum through a nozzle. Since the amount of melt is insignificant compared with the amount of fertilizer, the temperature in the drum is practically the same as the ambient temperature.

The use of the proposed method allows, compared with the known method, to increase the slowing down of the nitrification of fertilizers by 2.5-5.7 times and thereby reduce fertilizer consumption during the growing season.

Claims (1)

METHOD FOR PRODUCING NITROGEN: FERTILIZERS by treating fertilizer granules with nitrification inhibitors, characterized in that, in order to reduce the rate of nitrification, 1-carbamoyl-3 (5) -methylpyr’zole or N- (6-chlorhexyl) - melt is used 1-carbamoyl3 (5) -methylpyrazole in an amount of 1.0-.1.5% by weight of fertilizer. SU ... 1198049> f and 98049