The relationship between nitrogen application and chlorophyll content
Chlorophyll content has a good correlation with photosynthetic capacity, developmental stage and nitrogen status of vegetation. It is an indicator of nitrogen stress, photosynthesis ability and vegetation development stage. Therefore, the determination of chlorophyll content in crops is monitored and tested in agricultural conditions. Production estimation and other aspects are of great significance. The traditional method of crop chlorophyll detection mainly uses the method of chemical experiments of picking crop leaves. It not only needs to destroy the growth of the crop, but also takes time and effort, which can not meet the needs of efficient crop production management. Therefore, there is an urgent need to find efficient and non-destructive methods for measuring crop chlorophyll and moisture information.
The level of nitrogen applied can be determined by the amount of fertilizer applied, while the chlorophyll content can be determined by the chlorophyll content meter. There are many kinds of chlorophyll content meters on the market today, among which the SPAD502 produced by Japan Konica Minolta has the highest performance. The SPAD502 is a compact, portable handheld chlorophyll meter. The biggest feature of this instrument is its compactness and flexible use. You only need to place the blade on the head of the handheld chlorophyll meter, and then press the head. When the instrument makes a dripping sound, the chlorophyll value (SPAD value) will be displayed on the screen of the instrument. Very convenient and quick. Holding the chlorophyll meter will not cause any damage to the blade, which is one of its advantages.
The correlation analysis between spectral reflectance and chlorophyll content of corn canopy under different nitrogen application levels showed that the correlation between the two levels was the best under normal nitrogen application level, which was significantly higher than the correlation coefficient between high and low nitrogen application levels. Normal>r high>r low, and normal and high nitrogen application areas were positively correlated, while low nitrogen application areas were negatively correlated. Under the normal nitrogen application level, the relationship between spectral reflectance and chlorophyll content in corn canopy at different growth stages was analyzed. The results showed that the absolute value of the correlation coefficient of the canopy began to rise and then declined from the seedling stage in the 400-1000 nm wavelength range. , The trend of rose after flowering silking stage reached the minimum, among which the canopy reflectance spectrum at corn jointing stage and filling stage was positively correlated with the chlorophyll content, but negative correlation was found between seedling stage, bell mouth stage and flowering silking stage. relationship. During the whole growth period, jointing stage and bell-mouth period are sensitive periods for detecting chlorophyll content.
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