Fertilization principle
(1) Rational application of organic fertilizer, reduction of the amount of nitrogen and phosphorus fertilizer, increase of potassium fertilizer, non-calcium soil and acid soil need to supplement calcium, magnesium, boron and other trace elements. It is recommended to apply bio-organic fertilizer and rooting functional water-soluble fertilizer.
(2) According to crop yield, sorghum and soil fertility conditions, rational allocation of chemical fertilizer, most of the phosphorus fertilizer application, nitrogen and potassium fertilizer application; in the early stage of growth should not be frequent flood irrigation, pay attention to post-flowering and late-stage topdressing, high-potassium compound fertilizer in the middle and late stages of topdressing Or water soluble fertilizer.
(3) Combine with high-yield cultivation techniques and adopt the principle of “small number of times†to rationally fertilize.
(4) The old shed with soil degradation needs to return to the field or apply high organic fertilizer with high C/N ratio, reduce the amount of fertilized manure, increase the number of rotations, and achieve the purpose of desalting and reducing continuous cropping obstacles.
(5) Advocate the application of water and fertilizer integration technology to achieve water control and fertilizer control, improve quality and increase production costs.
2. Fertilization advice
(1) The seedling fertilizer is added with decomposed organic fertilizer and supplemented with phosphate fertilizer. 60-100 kg of decomposed poultry manure is applied per 10 square meters of seedbed, 0.5-1 kg of calcium magnesium phosphate fertilizer, 0.5 kg of potassium sulfate is sprayed 0.5% according to the seedling condition. -0.1% urea solution 1-2 times.
(2) 4-5 square meters/mu of high-quality organic fertilizer applied to base fertilizer.
(3) Production level 4000-6000 kg/mu: nitrogen fertilizer (N) 15-20 kg/mu, phosphate fertilizer (P2O5) 5-8 kg/mu, potash fertilizer (K2O) 20-25 kg/mu; production level 6000-8000 Kg/mu: nitrogen fertilizer (N) 20-30 kg/mu, phosphate fertilizer (P2O5) 7-10 kg/mu, potash fertilizer (K2O) 30-35 kg/mu; production level 8000-10000 kg/mu: nitrogen fertilizer (N) 30-38 kg/mu, phosphate fertilizer (P2O5) 9-12 kg/mu, potash fertilizer (K2O) 35-40 kg/mu.
More than 70% of the phosphate fertilizer is used as the base fertilizer strip (point), and the rest is applied with 20%-30% nitrogen and potassium fertilizer base application, and 70%-80% of the compound fertilizer is applied with water 7-11 times. After transplanting, the rooting functional fertilizer should be applied once, and the high-nitrogen water soluble fertilizer or compound fertilizer should be applied 2-3 times before the flowering, and the high-potassium compound fertilizer or water-soluble fertilizer should be applied 4-7 times after the flowering, and the nitrogen fertilizer should be applied every time. N) no more than 4 kg / mu. After entering the fruiting period, the roots can reduce the fertilizer absorption capacity by spraying 0.05-0.1% urea, calcium nitrate, borax and other aqueous solutions, which is beneficial to delaying aging, prolonging the harvesting period and improving fruit quality.
(4) When the soil pH of the vegetable field is less than 6, the calcium, magnesium and boron are easily deficient, and the calcium fertilizer (Ca) is 50-75 kg/mu, and the magnesium fertilizer (Mg) is 4-6 kg/mu. 2-3 times of 0.1% concentration of boron fertilizer. (Source: Ministry of Agriculture)
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