Nitrogen balance spectroscopy-based wheat spring nitrogenous fertilizer application method, and construction method of nitrogen topdressing amount model thereof

Abstract

The invention discloses a nitrogen balance spectroscopy-based wheat spring nitrogenous fertilizer application method, and a construction method of a nitrogen topdressing amount model thereof. The model construction method comprises the following steps: 1, determining a wheat target output and a yield increase coefficient; 2, determining the spectrum of wheat in a nitrogenous fertilizer blank area; 3, determining the spectrum of wheat in a spring sufficient nitrogenous fertilizer application area; 4, screening the equivalent expression form between a vegetation difference index and an optimized total nitrogen application amount; and 5, constructing the nitrogen topdressing amount model. The nitrogenous fertilizer application method comprises the following steps: A, acquiring information; B, determining the yield increase coefficient; C, determining the optimized total nitrogen application amount for the target output; D, determining the equivalent weight required by the difference index of per unit of vegetation; and E, calculating the nitrogen topdressing amount. A suitable nitrogenous fertilizer space-time optimization scheme is determined according to real-time on-site obtained wheat crop growth conditions, so the nitrogenous fertilizer utilization rate is improved on the premise of guaranteeing the output of crops, the application method adapts to inevitable requirements of development of the modern agriculture, and technical support is provided for technical development of accurate agriculture.

Description

technical field [0001] The invention relates to the technical field of non-destructive monitoring of agricultural vegetation growth information, in particular to a method for applying nitrogen fertilizer to wheat in spring and a method for constructing a topdressing nitrogen amount model based on nitrogen balance spectroscopy. Background technique [0002] Wheat is the main food crop in my country, and its yield directly affects people's lives and national food security. The scientific and rational regulation of wheat nitrogen is the most important link in wheat production management. With the increase of wheat production level, the amount of nitrogen fertilizer continues to rise. In some areas of my country, the customary nitrogen application rate is as high as 300kg.hm -2 and above, while the actual nitrogen use efficiency is only 20%. With the increase of nitrogen application rate, although the yield per unit area of ​​crops increased to a certain extent, the nitrogen u...

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Problems solved by technology

With the increase of nitrogen application rate, although the yield per unit area of ​​crops has increased to a certain extent, the nitrogen use efficiency has decreased significantly, and the environmental pollution effect has aggravated.

[0003] Nitrogen fertilizer management in production is uniform fertilization based on experience, but due to the variation of soil fertility, the spatial variation of crop growth is very large, and there is a contradiction between the fertilizer supply of the soil bank and the nutritional needs of crops, which seriously affects the growth and development of crops

Modern scientific fertilization mostly uses soil testing and fertilization, but conventional field soil sampling and indoor analysis are complicated, time-consuming and labor-intensive, and the cost of large-scale high-density soil testing is too high

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