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The crop yield is also affected by two aspects: leaf senescence and leaf disease. In the process of leaf senescence, not only macromolecular substances (such as proteins), antioxidants, various nutrients are degraded, but also substance accumulation and translocation are limited. On the one hand, usually after the leaves enter the aging stage, the resistance to pathogenic bacteria is also weakened. The infection of these bacteria causes the quality of the fruits of the plants to deteriorate, and even causes the body to become pathogenic. On the other hand, some aging is necessary for the plant body, for example, to promote cotton seeding to be topped, ie to remove new leaves, otherwise the quality and quantity of cellulose will decrease. Therefore, it is necessary to artificially control (promote or inhibit) the occurrence of leaf senescence in production practice.
The main cause of disease in leaves is that the chlorophyll content in the leaves of the plants is destroyed, and the leaves turn pale green or yellow-green and are called chlorosis; the yellow leaves are commonly called yellow; the leaves turn yellow-green or yellow-white mosaic Called mosaic, this can be directly viewed with the eyes. If you want to accurately understand the amount of chlorophyll destroyed, use the handheld chlorophyll meter directly to understand the chlorophyll content of the plant leaf. The damage of chlorophyll directly affects the plant's Photosynthesis, so protective measures must be carried out, there are three special protection methods, namely physical control, chemical control and biological control, physical control is mainly to deal with the soil environment and necrotic leaves, and chemical control is the use of pesticides To deal with the use of biological control is to adjust the environment of microorganisms to achieve the effect of harm, each has its advantages and disadvantages.
Measuring the chlorophyll content in the leaves using the chlorophyll meter can also measure the amount of nitrogen deficiency in the plant. This method can reduce nearly 10% of the nitrogen fertilizer without affecting the yield change.
Two large leaf factors affect crop yield
Two major leaf factors affecting the yield of crops Leaf is an important place for plants to carry out photosynthesis and absorb water and CO2 to generate energy. It is also a plant that synthesizes amino acids, antioxidants, and various nutrients. A large part of the crop's yield is affected by the leaves of the plant. In agriculture, the output of the crop is often measured by measuring the size of the leaf area. The measurement of the leaf area is generally measured using a professional measuring instrument and can be used. Portable leaf area meter for measurement.