Relationship between chlorophyll content and SPAD value of flue-cured tobacco and its determination method

Relationship between chlorophyll content and SPAD value of flue-cured tobacco and its determination method

Nitrogen is one of the most important elements in the growth and development of flue-cured tobacco, and has a great influence on the yield and quality of flue-cured tobacco. This is well verified in other vegetables and fruits, and there is a certain relationship between nitrogen and chlorophyll content. There are many verifications. The use of chlorophyll detectors to guide plants to apply nitrogen fertilizer can be achieved. While reducing the yield of crops while reducing the application of 10% of nitrogen fertilizer, the use of a portable chlorophyll meter can be considered for the application of N fertilizer.
In a certain range, there is a correlation between nitrogen nutrition and leaf chlorophyll content, color, intrinsic chemical quality and aroma quality, while chlorophyll content decreases with the increase of leaf area and maturity. Flue-cured tobacco is sensitive to nutrient changes. In order to obtain high-yield and high-quality tobacco, the leaf color change of flue-cured tobacco leaves is usually used as an important indicator of nutrition management, tobacco nutrient status tracking, and tobacco leaf maturity assessment.
The chlorophyll meter was used to measure the SPAD value of the tobacco leaves, and the chlorophyll content of the plants was measured using the traditional chlorophyll extraction method. When the two were compared, the chlorophyll content of the plants was directly proportional to the SPAD value. of. At the same time, the leaves of different growth stages of tobacco leaves were studied and it was found that the chlorophyll content of flue-cured tobacco leaves will vary according to different varieties, different levels of nitrogen fertilizer application, different leaf positions, different parts of the same leaf position, and different maturity, depending on the specific production. Objectives and tests require the use of appropriate methods of measurement. When the determination of the chlorophyll content of tobacco leaves is performed, a representative selection is made to determine the chlorophyll content of the tobacco leaf so as to ensure the accuracy of measurement.