After physiological fruit drop, the berry hypertrophy irrigation period from the growth period to the coloring period usually begins in late June, and once every 5-6 days during drought, the water is poured. In the middle and early August, the fruit begins to color and grow rapidly. At this time, it is necessary to connect irrigation to carry out the post-fertilizer, so that the berries can quickly enlarge.
Precooked before the water: in the fruit period before the ear ripening coupled with fertilization, irrigation once the water before the berry cooked, this can make up for the lack of moisture in the late grape growth, improve grape yield and character, and effectively avoid the occurrence of "soft tip".
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.
Chitin,Chitosan,Chitosan Oligosaccharide,Carboxymethyl chitosan
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