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Method for improving acid soil by applying ammonium nitrogen fertilizer and nitrification inhibitor in matched manner and application of method

A technology of nitrification inhibitor and ammonium nitrogen fertilizer, applied in fertilization methods, applications, land preparation methods, etc., can solve the problems of nitrate nitrogen exclusion, accelerated soil acidification, and soil pH increase.

Inactive Publication Date: 2014-03-26
INST OF SOIL SCI CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003]The nitrification reaction from ammonium nitrogen to nitrate nitrogen in the soil under low pH acidic conditions is inhibited, but hydrolysis occurs after urea and ammonium bicarbonate are applied to the soil reaction and release of hydroxyl groups, leading to an increase in soil pH, which promotes the occurrence of nitrification in the soil, thereby accelerating soil acidification (Cai Zucong, Zhao Wei. Journal of Soil Science, 2009. 46(5): 795–801.)
If effective measures can be taken to control the nitrification reaction of soil after fertilization without affecting the hydrolysis reaction of nitrogen fertilizer, then nitrogen fertilization will not only not accelerate soil acidification, but also improve the acidified soil to a certain extent, turning disadvantage into benefit
In addition, inhibiting the nitrification reaction of ammonium nitrogen fertilizers can also reduce the risk of nitrogen leaching, because the soil is negatively charged and has a strong ability to absorb ammonium nitrogen, but has a repelling effect on nitrate nitrogen.

Method used

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  • Method for improving acid soil by applying ammonium nitrogen fertilizer and nitrification inhibitor in matched manner and application of method
  • Method for improving acid soil by applying ammonium nitrogen fertilizer and nitrification inhibitor in matched manner and application of method
  • Method for improving acid soil by applying ammonium nitrogen fertilizer and nitrification inhibitor in matched manner and application of method

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Experimental program
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Effect test

Embodiment 1

[0017] Improvement effect of urea, ammonium bicarbonate and dicyandiamide on soil acidity—weigh 350g of 20-mesh air-dried soil samples in a set of plastic cups, and set up control (no nitrogen fertilizer and dicyandiamide) and control ( plus dicyandiamide), 200mg N / kg urea, 200mg N / kg ammonium bicarbonate, 200mg N / kg urea + dicyandiamide, 200mg N / kg ammonium bicarbonate + dicyandiamide, 400mg N / kg urea, 400mg N / kg ammonium bicarbonate, 400mg N / kg urea + dicyandiamide and 400mg N / kg ammonium bicarbonate + dicyandiamide are combined for treatment. After fully mixing the soil, nitrogen fertilizer and dicyandiamide, adjust the water content to 60% of the field water holding capacity, then cultivate at a constant temperature of 30°C, and adjust the soil water content every 5 days. On the 2nd, 4th, 9th, 16th, 26th, 36th, 46th, 57th, 72nd and 85th days of cultivation, samples were taken to measure soil pH, ammonia nitrogen and nitrate nitrogen.

[0018] When no chemical fertilizers ...

Embodiment 2

[0021] Effects of combined application of urea and dicyandiamide on acidity of red soil in potted conditions-potted experiments were carried out in a solar greenhouse, with 5.5 kg of soil in each pot, adding 150 mg N / kg urea and 7.5 mg / kg dicyandiamide, and top soil After mixing well, sow 5 corns per pot for daily management. After 18 days, 3 plants were planted in each pot, and the corn was harvested after 2 months. Soil samples were collected to measure soil pH, ammonium nitrogen and nitrate nitrogen content. The results showed that the soil pH of the simultaneous addition of urea and dicyandiamide was higher than that of the single addition of urea ( Figure 7 ), indicating that dicyandiamide can also increase soil pH by inhibiting nitrification and exerting the hydrolysis of urea under potted conditions. In the case of no planting, the content of ammonium nitrogen in the soil treated with dicyandiamide was higher than that in the treatment without dicyandiamide, and the ...

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Abstract

The invention discloses a method for improving acid soil by applying ammonium nitrogen fertilizer and a nitrification inhibitor in a matched manner and application of the method. The ammonium nitrogen fertilizer is urea and ammonium hydrogen carbonate; and the nitrification inhibitor is dicyandiamide. When the applying amount of chemical nitrogen fertilizer is 200-400mgN / kg of soil, the consumption of the dicyandiamide is 5-50 mgN / kg of soil. The specific applying method is realized by applying the nitrogen fertilizer and the dicyandiamide to the surface layer soil in a mixing manner to be fully mixed. According to the method, the soil acidity is improved while the fertilizing is carried out by using the characteristic that certain ammonium nitrogen fertilizer releases hydroxyl in the hydrolysis process; and the traditional method for accelerating the soil acidification by applying the ammonium nitrogen fertilizer is changed into the method for improving the acid soil, and thus the advantages can be changed into the advantages.

Description

technical field [0001] The invention belongs to the technical field of soil improvement and soil regulation, and relates to a method for improving acidic soil by using ammonium nitrogen fertilizer and nitrification inhibitor in combination with application and the application thereof. Background technique [0002] Research in recent years has found that my country's farmland soil is showing a trend of accelerated acidification. Compared with the situation in the second soil survey carried out in the mid-1980s, the average soil pH has dropped by 0.13-0.80 pH in 20 years. Extensive application of ammonium nitrogen fertilizer is considered to be the main reason for accelerating the acidification of farmland soil in my country, and its contribution to soil acidification is 20-221kmol H on average + / ha / a (Guo et al., 2010. Science 327:1008-1010.). Under natural conditions, there is often no surplus of nitrogen. However, artificial excessive application of chemical nitrogen fer...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A01B79/02A01C21/00C05G3/08C05G3/90
CPCY02P60/21
Inventor 姜军徐仁扣佟德利钱薇
Owner INST OF SOIL SCI CHINESE ACAD OF SCI