SU1470737A1 - Method of inhibiting nitrification of carbamide in soil - Google Patents

Abstract

The invention relates to methods for inhibiting the nitrification of nitrogen fertilizers (in particular, carbamide) in the soil and can be used in agriculture. The goal is to preserve the activity of a nitrification inhibitor when it is introduced into the soil together with urea. As a nitrification inhibitor, 1-hydroxymethyl-3/5 / -methylpyrazole is used, which is introduced into urea during the production of the latter. 3 tab.

Description

(21) 4142939 / 23-26

(22) 09.09,86

(46) 04/07/89. Bup. № 13

(72) V.G.Vodopin, Yu.I.Mushkin,

Yu.I. Dergunov, E.P.Trub,

T.V. Vasilyeva, Z.A.Polkova,

E.N. Boitsov, E.M.Magidov

and L.A.Kuvankina

(53) 631.841.7 (088.8)

(56) USSR author's certificate

No. 1113379, cl. C 07 D 231/12,

From 05 G 3/08, 1984.

(54) "METHOD OF INP1BORATED NITRIFICATION OF CARBAMIDE IN SOIL (57) The invention relates to methods of inhibiting the nitrification of nitrogenous fertilizers (in particular, urea) in the soil and can be used in agriculture. The goal is to preserve the activity of a nitrification inhibitor when it is introduced into the soil together with carbamide. As a nitrification inhibitor, 1-hydroxymethyl-3 (5) -methylpyrazole is used, which is introduced into urea during the production of the latter. 3 tab.

one

The invention relates to methods for inhibiting the nitrification of nitrogen fertilizers (in particular, urea) in the soil and can be used in agriculture.

The purpose of the invention is to preserve the activity of the nitrification inhibitor when introduced into the soil together with urea.

The method of inhibiting the carbamide nitrification in the soil involves the use of 3 (5) -methylpyrazole derivatives, and 1-hydroxymethyl-3 (5) -methylpyrazole, which is introduced into the carbamide during the production of the latter, is used as a nitrification inhibitor.

The inhibitory activity of 1-hydroxymethyl-3 (5) -methylpyrazole (P-W) does not change with the change in the way it is introduced into the soil: when introducing NR separately from urea and when introduced with urea, the inhibitory activity of NR is one and is the same. This significantly simplifies the process of introducing the nitrification inhibitor into the soil, since it is much more difficult to evenly distribute small amounts of the nitrification inhibitor in the soil than to distribute the fertilizer that already contains the inhibitor additive.

i Introduction of the GMF in the carbamide. can be carried out at different stages of the urea production process. It is preferable to introduce it into a solution or melt of carbamide before granulation, and then granulate the carbamide, for example, in a rotating drum, in a fluidized bed or by other methods.

Example 1. 500 g of air-dry soil are placed in 500 ml VESSELS, 200 mg of urea are added

"

Sde 41

3147

and 2.0 mg ran (2% of urea nitrogen). Then the soil is moistened to 60% of full moisture capacity and held in a thermostat at 28-30 ° C. After the sample has been withdrawn for 14 days, the degree of nitrification is determined by determining the content of nitrate and ammonium nitrogen.

The degree of inhibition I (%) was determined by the formula

I

100

/

where a is the content of nitrates and nitrites after, tested in a soil sample, where urea without an inhibitor is applied; b is the content of nitrates and nitrites after being tested in a soil sample where urea with an inhibitor is introduced; with the content of nitrates and nitrites in the soil sample, where

urea is not made. In comparison with the same conditions, known derivatives of 3 (5) -methylpyrazole,

The test results for examples 1-4 are given in table. t.

Example 2. In the drum, 500 g of granulated urea are poured and a curtain is made of it when the drum rotates. 10 g of GMF dissolved in the melt of 490 g of urea are fed to the curtain of fertilizer from the melter with a mechanical nozzle. The obtained fertilizer (2% GMP from nitrogen of carbamide) is introduced into the soil, after 14 days the content of nitrate and ammonium nitrogen and the degree of inhibition of nitrification are determined as in Example 1.

At the same time, the fertility of the obtained fertilizer is determined by the following method. A sample of urea with the additive is placed in a cylindrical mold under load. 0.6 kg / cm and alternately hold for 10-12 hours in a thermostat at 50 ° C and a relative humidity of 50%, then in a thermostat at 20 ° C and a relative humidity of 80%. The number of half cycles is 7. Untreated carbamide is then combined into a single solid briquette.

The friability of carbamide samples (%) with and without additives is evaluated by the results of sieving of samples in

standard conditions: sieve with a diameter of 180 mm, cell size 5 mm, sieving time 2 min, oscillation frequency 2 s according to the formula

with

Q

0 5

Jq

A 1.100,

where H is the mass of the sample of urea; besides DPJ sowing, g;

. M is the mass of urea passed through the sieve,

Data on the fertility of fertilizer 5 are given in table. 2

DP comparisons determine the carbamide paccbjnactivity with additives of known nitrification inhibitors; samples of carbamide with these additives are obtained under the same conditions as with FC additives.

Example 3. 990 g of granulated urea are poured into the b-drum and a curtain is created from it while the drum rotates. 10 g of a melt of the nitrification inhibitor of the GMF are fed to the curtain of fertilizer from the melter with a mechanical nozzle. The resulting fertilizer is applied to the soil, after 14 days the content of nitrate and ammonium nitrogen and the degree of inhibition of nitrification are determined, as in Example 1.

Example 4. 400 kg of water are poured into the container, 500 kg of urea and 10 kg of GMF are added. With stirring, the solution is heated to 70-80 ° C and fed through a mechanical nozzle into a fluidized bed containing 490 kg of granulated urea.

The resulting fertilizer is applied to the soil, after 14 days the content of nitrate and ammonium nitrogen and the degree of inhibition of nitrification are determined, as in Example 1.

Example 5. The experiments described in Example 1 were repeated at various concentrations of nitrification inhibitors in the soil.

The test results for examples 5-6 are given in table. 3

Example 6. The experiment described in Example 3 was repeated at various concentrations of GMF and known nitrification inhibitors.

As can be seen from examples 1-6, in the proposed method, the activity of the nitrification inhibitor is maintained at

35

40

50

1470737.

ip pi bi bi yin

entering it into the soil with carbamide.

Claims (1)

Invention Formula A method of inhibiting the nitrification of carbamide in the soil, comprising Nitrification inhibitor The content of the inhibitor,% of nitrogen carbamide ran 1-Carbamosh1-3 (5) -methyl-pyrazole 1- (6-Xpop-n-hexyl) -carbamoyl-3 (5) -methyl1- (6-Chloro-n-hexyl) -carbamo (5) -methyl pyrazole Without inhibitor Nitrification inhibitor The degree of inhibition of nitrification of I, Z when the content of the inhibitor (% of nitrogen carbamide) Example 5 (separate application Example 6 (co-administration) 0.5 1.5 2.0 2.5 91.7 93.1 92.0 92.6 89, 9 91.3 90.0 92, 0 57.9 91.3 92.3 93.0 94.5 37.2 at . the use of 3 (5) -methyl-pyrazole derivatives, characterized in that, in order to preserve and "girushistey activity when they are combined, introduced into the soil, 1-hydroxymethyl-3 (5) -methylpyrazole is used as a nitrification inhibitor. Table 1 The degree of inhibition of nitrification Ij Z in sierozem on chernozem 92 90 82 83 2.0 0.0 42 20 Table 3 Example 6 (co-administration) 2.0 J 2.5 0.5 1.5 93.1 68.3 40.9 93.0 71.0 43.0 93.8 69.8 62.1