1, pay attention to the appropriate application of CO2 gas fertilizer CO2 gas fertilizer, can make plants grow robustly, improve product quality and yield. 2. Pay attention to the characteristics of vegetables requiring fertilizers The principle of total fertilization for vegetables is to pay attention to nitrogen fertilizer in leafy vegetables, pay attention to phosphorus fertilizer in fruit and vegetables, pay attention to potash fertilizer in roots and vegetables, and balance fertilization. 3, pay attention to phosphorus and zinc fertilizer can not be mixed with phosphorus, zinc often occurs between the antagonistic, excessive use of phosphate will inhibit the absorption of zinc. Greenhouses have high temperatures and high humidity. The availability of phosphorus is 2 to 3 times higher than that of exposed land. Therefore, attention should be paid to reducing the amount of phosphorus to prevent the effectiveness of zinc. If zinc deficiency symptoms occur, 0.05%~0.2% zinc sulfate can be sprayed on the leaves. 4, pay attention to the potassium, magnesium between the antagonistic potassium and magnesium often antagonism, so the application of potassium fertilizer in vegetables must be due to soil, due to crop fertilization. If the application of potassium is excessive, the yellowness of the veins in the veins of the cucumber and the veins of the leaves are still green; yellow patches are first found in the middle leaves of the tomatoes. Magnesium deficiency can be sprayed with magnesium sulfate or calcium magnesium phosphate leachate. 5, pay attention to the amount of nitrogen fertilizer application of excessive nitrogen fertilizer not only high levels of nitrate in vegetables, can not reach pollution-free standards, but also inhibit the absorption of some other elements. Too much nitrogen fertilizer will affect the absorption of calcium, resulting in longitudinal cracking of the eggplant sepals, wood corkation, cabbage browning inside, rotten, etc.; also cause symptoms of boron deficiency in vegetables, such as vegetable seedlings bald. 6. Note that it is not appropriate to use ammonium chloride or potassium chloride because chloride ions can reduce vegetable starch and sugar content, deteriorate quality, and reduce yield. It can also remain in the soil, poison the roots or cause soil compaction, and increase soil salinity. 7, note that greenhouse vegetables should not be applied ammonium bicarbonate can easily be evaporated into ammonia, especially in greenhouses, high temperature chambers, volatile even more. Even if the room is open for ventilation during the day, it cannot be sprinkled or applied with water to prevent the vegetables from being smeared and killed by ammonia. 8. Pay attention to the use of phosphate fertilizer Phosphate fertilizer is not easy to move in the soil, and it is easily absorbed by the soil after contact with the soil. Therefore, the phosphate fertilizer should be granulated or dispersedly applied. 9, pay attention to the use of potassium potency 10, the growth period of the vegetables can be a one-time end of the application, the growth period can be chasing the bottom half. Potassium fertilizer is best before flowering, and potassium deficiency should be sprayed later. Iron is easily converted into insoluble compounds by the soil and loses its fertility. It cannot be recycled in the leaves of vegetables. It is sprayed with 0.1%~0.3% ferrous sulfate aqueous solution and sprayed finely and every 5~7 days. Continuous spraying 2~3 times. If iron fertilizer is applied top or bottom, it should be mixed and used together with organic fertilizer.
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