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During the growth period of summer maize, the chlorophyll content of the leaves was regularly observed with the SPAD-502 chlorophyll meter. The chlorophyll meter was used to measure the emission light intensity of the certain wavelength and the intensity of light transmitted through the leaves according to the absorption characteristics of the leaf chlorophyll to the colored light. Determination of chlorophyll content. The SPAD-502 Chlorophyll Meter has two emitting light sources that emit red light with a maximum wavelength of 650 nm and infrared light with a maximum wavelength of 940 nm, respectively. Chlorophyll absorbs red light with a wavelength of 650 nm, but does not absorb infrared light with a wavelength of 940 nm.
At the fertilization level, the more adequate the farmland water supply (the greater the amount of irrigation water), the higher the total chlorophyll content of the crop, and the more obvious the change with the crop growth stage. At the irrigation level, the maximum total chlorophyll content (nitrogen content) was obtained by N2 fertilization treatment. However, the difference between the different N treatment SPAD-502 chlorophyll meter tests was not obvious. It can be understood that this is due to soil moisture. Deficit limits the use of nitrogen fertilizers.
The SPAD-502 chlorophyll meter is used to measure the padding value by a certain optical principle. This value has a certain relationship with the chlorophyll content, which indirectly indicates the amount of nitrogen in the leaf. This is an important numerical basis for the analysis of soil nitrogen and moisture analysis. Soil nitrogen has a certain influence on the photosynthetic rate and the degree of activity of crops.
How SPAD-502 Chlorophyll Meter Measures Soil Nitrogen Status
Nitrogen content in soil is a necessity for crop growth, and nitrogen is also an important cause of environmental impact. Determination of Nitrogen Absorption in Crops Determining the Fertilization Measures Rational use of resources in all aspects is an important approach to environmental protection. However, the measurement and evaluation of nitrogen determination is difficult. Therefore, the nitrogen content of indirectly reacted soil can be determined by SPAD-502 chlorophyll meter on the spad value of crop leaves, and the relationship between them can be analyzed.