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Crop nitrogen demand real-time acquisition method

A technology of real-time acquisition and demand, applied in the direction of measuring devices, testing plant materials, testing plants/trees, etc., can solve problems such as poor timeliness and heavy workload, and achieve high universality, increase timeliness, and high precision Effect

Active Publication Date: 2019-01-15
INST OF SOIL SCI CHINESE ACAD OF SCI
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Problems solved by technology

The critical nitrogen concentration of crops is used as the target nitrogen concentration for nitrogen nutrition diagnosis, and the nitrogen demand of crops can be calculated by the difference between the actual nitrogen concentration and the target nitrogen concentration, but currently using this method requires destructive sampling of crops Analysis, heavy workload, poor timeliness

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  • Crop nitrogen demand real-time acquisition method
  • Crop nitrogen demand real-time acquisition method
  • Crop nitrogen demand real-time acquisition method

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Embodiment Construction

[0044] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0045]The present invention designs a method for obtaining real-time nitrogen demand of crops, which is used to obtain the nitrogen demand of target crops in the target area in real time, such as figure 1 shown, including the following steps:

[0046] Step A. According to the critical nitrogen dilution curve of the target crop and the aboveground dry matter mass DM of the target crop under different nitrogen application levels, calculate and obtain the critical N concentration value criticalN of the target crop under different nitrogen application levels c , then go to step B. Among them, the destructive sampling method was used to obtain the aboveground dry matter DM of the target crop under different nitrogen application levels.

[0047] Step B. According to the following formula:

[0048]

[0049] Obtain the nit...

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Abstract

The invention relates to a crop nitrogen demand real-time acquisition method. For the problems of large workload and relatively poor timeliness due to the fact that crops need to be subjected to destructive sampling analysis in a traditional crop nitrogen demand calculation method, a model between a crop nitrogen demand and a crop nitrogen nutrition index is built, and the complex crop nitrogen demand calculation is converted into the crop nitrogen nutrition index acquisition, so that the timeliness of crop nitrogen nutrition diagnosis is greatly improved; the design model not only has relatively high precision but also considers the growth period difference of the crops and the utilization ratio difference of nitrogen fertilizers in different planting regions, thereby having relatively high universality; and the building of the model can provide guidance for precise nitrogen fertilizer management of the crops, and has important practical significance for nitrogen fertilizer reductionand agricultural sustainable development.

Description

technical field [0001] The invention relates to a method for acquiring crop nitrogen demand in real time, and belongs to the technical field of rapid detection of crop nitrogen nutrition information. Background technique [0002] Nitrogen fertilizer is the fertilizer with the largest amount of input in agricultural production. In eastern China, due to excessive nitrogen fertilizer application and unscientific fertilization methods, less than 30% of nitrogen fertilizer applied in farmland can be absorbed and utilized by crops. Real-time nitrogen nutrition diagnosis and quantitative analysis of crop nitrogen requirements will help formulate reasonable nitrogen fertilizer management measures and improve nitrogen fertilizer use efficiency. [0003] At present, there are many studies on real-time nitrogen nutrition diagnosis during crop growth, such as the use of portable chlorophyll meters, multi-spectral or hyperspectral equipment, digital cameras, etc. These studies have esta...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/25G01N21/84G01N21/64G01N21/00G01N33/00
CPCG01N21/00G01N21/25G01N21/64G01N21/84G01N33/0098G01N2021/8466
Inventor 王远施卫明王德建
Owner INST OF SOIL SCI CHINESE ACAD OF SCI
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