There are many ways to reduce the loss of nitrogen fertilizer. Besides the loss of nitrogen, it can also be produced by nitrification and denitrification. Therefore, improving the nitrogen use efficiency is mainly to prevent ammonium nitration. The main measures are:
1, deep fertilization: the ammonium nitrogen fertilizer or urea deep into the 3 - 5 cm deep reduction layer, ammonium ions for the soil colloid adsorption, kept in the reducing layer, to avoid fertilizer in the oxide layer nitrification to increase nitrogen Utilization rate. Deep fertilization can be divided into deep application of ball fertilizer, deep application of full depth and deep application of liquid fertilizer.
2, the use of nitrogen fertilizer synergist: also known as nitrification inhibitors, namely the use of chemical agents to inhibit microbial nitrification and denitrification in paddy soil in order to reduce the loss of nitrogen. The main nitrogen fertilizer synergists currently used are cypyl, pyridine and thiourea.
3, the application of long-acting nitrogen fertilizer: There are mainly three kinds of long-acting nitrogen fertilizer, one is organic synthetic nitrogen fertilizer, such as urea formaldehyde fertilizer; the second is coating fertilizer, such as sulfur coating film; third is long-term inorganic nitrogen fertilizer, such as ammonium magnesium phosphate . The long-term nitrogen fertilizer is mainly to prevent the loss of soluble nitrogen fertilizer, so that the supply of nitrogen is consistent with the absorption of nitrogen in the growth process of rice as much as possible, so as to improve the utilization rate of nitrogen fertilizer, and at the same time avoid large-scale nitrogen fertilizer application causing burning seedlings.
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