Onion is an annual balanced supply of spicy leafy vegetables, extremely resistant to storage and transportation, low production costs, and greater economic and social benefits. Anhui Province is one of the important producing regions of Chinese green onions. Since 2000, scientific and technical personnel of the Soil Fertility Research Institute of Anhui Academy of Agricultural Sciences have carried out research and promotion of onion balancing fertilization technology in Xiangyang City, the main producing area of ​​Welsh Onion, and has made significant progress. Onion high-yield cultivation up to 5000 ~ 6000 kg / acre, high yield, absorb more nutrients, each production of 1,000 kilograms of green onions require pure nitrogen 2.7 ~ 3.3 kg, 0.5 ~ 0.6 kg of phosphorus pentoxide, potassium oxide 3.3 ~ 4.0 kg, nitrogen The absorption ratio of phosphorus and potassium is 1:0.4:1.3, which is very sensitive to potassium and nitrogen nutrition. In the agricultural production of the Huaibei Plain, reapplication of N and P fertilizers resulted in serious or no application of K fertilizer. The content of available K decreased significantly, and the proportion of N, P and K was seriously degraded, which led to aggravation of diseases and insect pests of Welsh onion, reduced yield, and deterioration of quality. Decline in economic efficiency. Potassium application can promote the growth of Welsh onion and improve the resistance to diseases and insect pests. Lack of potassium growth of onion growth retardation, plant dwarf, light blue short, low yield. The results of the China-Canada Cooperative Balanced Fertilization Program undertaken by the Anhui Academy of Agricultural Sciences show that balanced balancing fertilization with green onions has a significant effect on yield increase, and can increase the vitamin C and soluble sugar content of Welsh onion, reduce the content of harmful substances such as nitrates, and improve The onion's intrinsic and appearance qualities increase farmers' income. Field trial results showed that after application of potash fertilizer, welsh onion production increased by 22.3% to 28.2%, vitamin C content increased by 7.20% to 16.0%, soluble sugar content increased by 15.5% and 12.7%, and nitrate content decreased by 22.6% and 26.5%; Increase the income of 1690 to 2000 yuan, the application of potash fertilizer production ratio of up to 72.42 and 40.67:1. In Linquan County in the past three years, the demonstration has promoted balanced on-site fertilization of onions with potash fertilizer as the center, covering an area of ​​more than 35,000 mu, with an average increase of 20%. Onion balanced fertilization technology is simple and easy to apply fertilizer: On the basis of the application of organic fertilizer, medium-fertility plots, the appropriate amount of fertilizer application of pure nitrogen 20-25 kg per acre, phosphorus pentoxide 6-8 kg, potassium oxide 20 ~ 30 kilograms, equivalent to 40 ~ 55 kilograms of urea, general pass calcium phosphate (effective phosphorus content 12%) 50 ~ 65 kilograms, potassium chloride (potassium content 60%) 35 ~ 50kg. In the case of low soil fertility and lack of organic fertilizer, higher fertilization rates may be considered; conversely, if the soil fertility is high and the soil fertility foundation is good, the fertilization amount may be appropriately reduced. Fertilization method: Before the scallion is sown, 20% of nitrogen and potassium fertilizers and all of the phosphorous fertilizers are mixed as the base fertilizer for full-layer application and deep-turned into the soil. The remaining 80% of nitrogen and potassium fertilizers are topdressing and are applied twice in mid-September and mid-October.
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The
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light sensitive of unstable,.
The capsules do not
need adhesives and numerous excipients during the production process,
easy to disintegrate and release in gastric juice.
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