1. Insufficient supply of soil water can not meet the growth and development needs of cypress trees, resulting in thin or wilting leaves and yellow tips, leading to early defoliation. Or the drainage is not smooth, the soil accumulates water, causing the roots to anaerobicly breathe for too long, accumulating too much alcohol, poisoning rotten roots. Or soil compaction, poor ventilation, resulting in yellow leaves.
2, planted too dense, poor ventilation and light transmission, the plants compete for fat, water, shade, affecting photosynthesis, respiratory consumption, resulting in yellow leaves, leading to early leaves.
3. Improper management of the field. If the seedlings are damaged, the roots are planted, the animal bites the branches or the human is wounded, causing yellow leaves. The pathogenic fungus is mainly an infecting cypress tree in the genus Alternaria, which causes leaf blight.
4, underground pest bites seedling bark is also easy to cause yellow leaves.
5. The yellowing of the leaves caused by lack of fertilizer or fertilization is unreasonable.
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Chitosan is a product of n-deacetylated chitosan. Chitin, chitosan and cellulose have similar chemical structure. Cellulose is hydroxyl group at C2 position, chitin and chitosan are replaced by an acetyl group and an amino group respectively at C2 position. Chitin and chitosan have many unique properties such as biodegradability, cell affinity and biological effect, especially chitosan containing free amino group, which is the only basic polysaccharide in natural polysaccharides.
The amino groups in the chitosan molecular structure are more reactive than the acetylamino groups in the chitin molecule, which makes the polysaccharide have excellent biological functions and can carry out chemical modification reaction. Therefore, chitosan is considered as a functional biomaterial with greater application potential than cellulose.
Chitosan is the product of natural polysaccharide chitin removing part of the acetyl group, with biodegradability, biocompatibility, non-toxicity, antibacterial, anti-cancer, lipid-lowering, immune enhancement and other physiological functions. Widely used in food additives, textile, agriculture, environmental protection, beauty care, cosmetics, antibacterial agent, medical fiber, medical dressings, artificial tissue materials, drug slow release materials, gene transduction carrier, biomedical fields, medical absorbable materials, tissue engineering carrier materials, medical and drug development, and many other fields and other daily-use chemical industry.
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