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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 inhibitors and ammonium nitrogen fertilizers, applied in fertilization methods, applications, and soil preparation methods, can solve problems such as accelerated soil acidification, acceleration, and nitrate nitrogen exclusion

Inactive Publication Date: 2012-04-25
INST OF SOIL SCI CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005]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

Examples

Experimental program
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Effect test

Embodiment 1

[0022] Effect of combined application of urea, ammonium bicarbonate and dicyandiamide on soil acidity—weigh 350g of air-dried soil over 20 meshes into a set of plastic cups, and set the control (no nitrogen fertilizer and dicyandiamide) and control ( Add dicyandiamide), 200 mg N / kg urea, 200mg N / kg ammonium bicarbonate, 200mg N / kg urea + dicyandiamide, 200mg N / kg ammonium bicarbonate + dicyandiamide, 400mg N / kg urea, 400mg Several combinations of N / kg ammonium bicarbonate, 400mg N / kg urea + dicyandiamide and 400mg N / kg ammonium bicarbonate + dicyandiamide were treated. The soil, nitrogen fertilizer and dicyandiamide are thoroughly mixed and the water content is adjusted to 60% of the field water holding capacity, and then cultivated at a constant temperature of 30 ℃, and the soil water content is adjusted every 5 days. Sampling was taken on the 2nd, 4th, 9th, 16, 26, 36, 46, 57, 72, and 85 days of culture to determine soil pH, ammonia nitrogen and nitrate nitrogen.

[0023] When...

Embodiment 2

[0027] Effect of combined application of urea and dicyandiamide on the acidity of red soil under potting conditions-potting experiments were carried out in a solar greenhouse, each potting soil 5.5 kg, 150mg N / kg urea and 7.5mg / kg dicyandiamide, and top soil After thorough mixing, 5 corns are sown in each pot for daily management. Three plants were planted in each pot after 18 days, and the corn was harvested after 2 months. Collect soil samples to determine soil pH, ammonium nitrogen and nitrate nitrogen content. The results showed that the pH of the soil treated with both urea and dicyandiamide was higher than that treated with urea alone ( Figure 7 ), indicating that dicyandiamide can also increase soil pH by inhibiting nitrification and exerting hydrolysis of urea under potting conditions. Without planting, the content of ammonium nitrogen in soil treated with dicyandiamide was higher than that without dicyandiamide, and the situation of nitrate nitrogen was opposite, ind...

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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

[0001] technical field [0002] 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. [0003] Background technique [0004] 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 ch...

Claims

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Application Information

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Patent Type & Authority Applications(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
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