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.
For different screening function, there are several different types of screening machines, namely circular vibrating screen, rotary trommel screen, high frequency screen and linear vibrating screen. However the application of these Screening Machine is a little different, circular vibrating screen is mainly used for sand and Stone Crushing Plant, where the final sizes is relatively big, the usage of rotary trommel screen is almost the same as the circular vibrating screen, and both of them can be used as washing and screening machine when with water. For example, both of them can be used for placer gold washing purpose; high frequency screen can be used for a ore processing plant and the linear vibrating screen is mainly used for fine powdery material screening.
Screening Machine
Screening Machine,Screen Machine,Sand Screening Machine,Screening Equipment
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