Nitrogen fertilizer applying method

Abstract

The invention relates to a nitrogen fertilizer applying method, and the method is as follows: a quantitative nitrogen fertilizer is respectively applied to rice in the seventh day, the fourteenth day, the thirty-fifth day, the forty-ninth day, the fifty-sixth day, the seventieth day and the seventy-seventh day after rice transplanting so as to improve rice yield and / or nitrogen utilization rate. The method has the advantages of timing and quantitative nitrogen fertilizer application and simple and easy operation. Compared with a real-time nitrogen management mode and a leaf age nitrogen application mode, the nitrogen fertilizer applying method can synchronously significantly improve the rice yield and the nitrogen utilization rate in a low fertility field, the nitrogen utilization rate in a medium fertility field of the nitrogen fertilizer applying method is higher than that of the leaf age nitrogen application mode, and the rice yield in a high fertility field of the nitrogen fertilizer applying method is higher than that of the real-time nitrogen management mode.

Description

technical field [0001] The invention relates to a method for applying nitrogen fertilizer, in particular to a method for applying nitrogen fertilizer for improving rice yield and / or nitrogen utilization rate. Background technique [0002] At this stage, the average amount of nitrogen fertilizer used in a single season in rice fields in my country is about 180kg hm -2 , about half higher than the world average. The high input of nitrogen fertilizer in my country's rice (Oryza sativa L.) production is not only closely related to the low level of nitrogen fertilizer management technology mastered by farmers, but also an objective requirement for my country's rice production to maintain high and stable yields to meet food security needs. Based on this, most of the research on rice nitrogen fertilizer management in my country is based on the premise of high and stable yield. Through continuous improvement of fertilization technology, nitrogen fertilizer use efficiency is improve...

AI Technical Summary

Problems solved by technology

Rice leaf-age nitrogen application mode, usually nitrogen fertilizer is divided into three parts: base fertilizer, tiller fertilizer and ear fertilizer, the rice yield is high, and the nitrogen fertilizer utilization rate is relatively high; real-time nitrogen fertilizer management mode, the number of nitrogen fertilizer application is not fixed, usually 4-7 times , the rice yield is relatively high, and the nitrogen use efficiency is high; the base fertilizer is cleared in one pass, and the number of nitrogen fertilizers is only used once, and the rice yield and nitrogen use efficiency are both low

Among the three nitrogen fertilizer application techniques, although the base fertilizer Yiyiqing uses less nitrogen fertilizer, the rice yield and nitrogen use efficiency are not high, which does not meet the requirements of high and stable rice production in my country; the implementation of nitrogen fertilizer management mode has high nitrogen use efficiency, but leaf SPAD detection is complicated and difficult. Instruments and equipment are expensive; although rice leaf-age nitrogen application mode achieves high rice yield, there is a certain gap in nitrogen use efficiency compared with real-time nitrogen fertilizer management mode

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