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Regulation and control method for rice nitrogen topdressing based on nitrogen spectral index method

A spectral index, rice technology, applied in fertilization methods, color/spectral characteristics measurement, fertilization devices, etc., can solve the problems of heavy workload, poor timeliness, too general, etc., to improve the level of precision and digital management, and improve quantification. level, the effect of enhancing mechanism and accuracy

Active Publication Date: 2012-11-14
神农智慧农业研究院南京有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, most of the existing research on nitrogen fertilizer application is to guide the amount of nitrogen fertilizer in the whole growth period, but there is no quantitative understanding of the application of rice panicle fertilizer in the key growth period, and some existing nitrogen topdressing control methods are mostly based on soil nutrient testing to guide fertilization. Large, poor timeliness
In addition, in most studies and applications, parameters such as nitrogen fertilizer use efficiency are set to fixed values, which is too general and makes the calculated value of nitrogen fertilizer use inaccurate

Method used

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  • Regulation and control method for rice nitrogen topdressing based on nitrogen spectral index method
  • Regulation and control method for rice nitrogen topdressing based on nitrogen spectral index method
  • Regulation and control method for rice nitrogen topdressing based on nitrogen spectral index method

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Embodiment 1

[0041] Such as figure 1 As shown in the flow chart, field nitrogen fertilizer experiments with different base tillering fertilizers were carried out at the Jiangning Experimental Station of Nanjing Agriculture and Forestry Bureau in 2007 and 2008 to test the nitrogen topdressing regulation method based on the nitrogen spectral index method. The variety for testing is Wuxiangjaponica 14, and the test establishes the processing (N1, N2, N3, N4, N5, N6) of 6 groups of different basal nitrogen fertilizer amounts, thereby artificially creating different rice growth conditions, and using the present invention on this basis The rice nitrogen topdressing control method involved quantitatively estimates and recommends the amount of nitrogen fertilizer topdressing in rice in the mid-term, so as to obtain different nitrogen fertilizer application amounts (N1r, N2r, N3r, N5r, N6r). Wherein N4 is the amount of nitrogen applied in a normal high-yield field, and as a control, fertilization i...

Embodiment 2

[0065] Such as Figure 6 As shown in the evaluation flow chart, field nitrogen fertilizer experiments with two different basal tillers (low-basal tillering treatment L and normal basal tillering treatment N) were set up at the Jiangning Experimental Station of Nanjing Agriculture and Forestry Bureau in 2009 to artificially create different rice growth vigor , before rice panicle fertilizer topdressing, utilize 5 kinds of nitrogen fertilizer control methods (nitrogen spectral index method NSI, leaf area index method LAI including the present invention) 【1】 , Field Nitrogen Fertilizer Management SSNM 【2】 , Nitrogen Nutrient Index Method NNI 【3】 , Nitrogen fertilizer optimization algorithm NFOA 【4】 ) to calculate the real-time nitrogen demand of rice and guide the input of nitrogen fertilizer, so as to compare and evaluate the advantages and disadvantages of the present invention and the prior art. The tested variety is Wuxiangjing 14. On this basis, set nitrogen blank area (...

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Abstract

The invention belongs to the technical field of crop growing management and discloses a regulation and control method for rice nitrogen topdressing based on a nitrogen spectral index method. According to the invention, the nitrogen spectral index method is constructed according to nitrogen amount required by target rice yield, apparent utilization rate of spike fertilizer, plant real-time nitrogen accumulation amount estimated based on reflectance spectrum and soil nitrogen supplying amount while nitrogen fertilization based on a nutrient balancing principle. According to the invention, in the aspect of real-time information acquisition, plant canopy group information is utilized, thus the regulation and control method disclosed by the invention has the quicker and lossless characteristics and the like, thereby avoiding the phenomenon of point replacing surface; in the aspect of a nitrogen topdressing regulating and controlling model, the soil nitrogen supplying amount and nitrogen fertilizer utilization rate during the middle-late period are quantified, thereby enhancing the mechanism characteristic and accuracy of nitrogen topdressing amount estimation and improving the quantification level.

Description

technical field [0001] The invention belongs to the technical field of crop cultivation management, and relates to a method for regulating and controlling nitrogen topdressing in rice based on a nitrogen spectral index method. Background technique [0002] It is one of the key technologies in the precision agriculture system to quickly obtain crop growth information and perform precise diagnosis and dynamic regulation and management. Plant nitrogen accumulation can directly reflect the growth and development of plants. Therefore, rapid estimation of nitrogen accumulation in rice plants is not only helpful for precise management and scientific operation of crop nitrogen fertilizers, but also for high-quality, high-yield, high-efficiency, ecology and safety. production target. [0003] For a long time, the determination of nitrogen accumulation in rice plants has relied on artificial destructive sampling and chemical analysis, which is time-consuming, laborious, dangerous and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A01C21/00G01N21/25
Inventor 田永超曹卫星朱艳姚霞陈青春
Owner 神农智慧农业研究院南京有限公司
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