Methods After the mango fruit picking, the post-harvest fertilizer was applied within 5 to 10 days. The high-quality organic fertilizer and the complete fertilizer of NPK were added, and the phosphorus and potassium fertilizers and biological bacterial fertilizer were added. The result tree of 5 years or more, or more than 50 kg of fruit. Plants, each planting fermented human and livestock manure 15-20 kg, NPK (15-15-15) potassium sulfate or nitrate-based or pure sulfur-based compound fertilizer 0.75 ~ 1 kg, superphosphate or Calcium magnesium phosphate fertilizer 0.75 ~ 1 kg, potassium sulfate 0.50 ~ 0.75 kg, compound biological fertilizer 0.25 ~ 0.50 kg. After harvesting the mango, the mango combines with the clearing garden to remove all kinds of weeds and litter falling fruits in the orchard. It is buried or burned outside the concentrated garden, and then drip around the canopy to dig deep and wide annular grooves of 25-30 cm each. After thoroughly mixing and mixing all the fertilizers, spread them in the annular groove and cover the soil.
In addition, spray the 0.1% magnesium sulfate, 0.2% urea, 0.3% potassium dihydrogen phosphate, and 600 times amino acid compound micro-fertilizer mixture every 7 to 10 days, and spray it continuously for 2 to 3 times to evenly spray the inside and outside of the canopy. All the branches and leaves should be dripped with water drops at the beginning, and various nutrients should be added from the leaves to accelerate the growth of the tree and promote healthy new shoots.
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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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