Reasonable use of vegetables for high yield of phosphate fertilizer
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Reasonable application of phosphorus fertilizer in vegetables, high yield and good quality. How to rationally apply phosphate fertilizer to vegetables? First of all, according to the laws of vegetable phosphorus, determine the best fertilization period and dosage. Vegetable seedling is the critical period of phosphorus requirement. If the seedling period is short of phosphorus, the plants are small, grow slowly, the roots are underdeveloped, the tip of the leaves is purple, and shrinking seedlings appear. Therefore, when sowing, phosphorus fertilizer should be used as a seed fertilizer or base fertilizer for centralized application. Fertilizer in general Mushi 15-20 kg of calcium phosphate or calcium phosphate fertilizer 25-40 kg. When used as base fertilizer, the amount can be increased appropriately. The period of vegetable formation is the second critical period of phosphorus, which is the most demand for phosphorus during this period. If phosphorus deficiency, it will seriously affect the yield of vegetables. Can be used 0.1% -0.2% potassium dihydrogen phosphate solution or 2% -3% of calcium superphosphate leachate for foliar spray. Second, according to the type of phosphate fertilizer, master the application method. The commonly used phosphate fertilizers are superphosphate and calcium magnesium phosphate. The calcium magnesium phosphate fertilizer is alkaline and has good application effect in acid soil. It is insoluble in water and is not suitable for topdressing. It can be used as base fertilizer or seed fertilizer after being piled with manure and other organic fertilizers. The effect is better. The calcium phosphate fertilizer has a long aftereffect and can remain in the soil by 70%-80%. Therefore, in the rotation of vegetables and leafy vegetables on the ground, they should be lightly applied after replanting. Superphosphate is an acidic water-soluble phosphate fertilizer. It can be used as base fertilizer, seed fertilizer, but also as a top dressing. Its activity is small, in the acid, alkaline soil, easy to produce chemical fixation of phosphorus, must be applied, acupuncture or deep application; best applied in the vicinity of vegetable roots in order to increase the effectiveness of phosphorus, so that Vegetables can be absorbed and used early. Again, choose the right variety and soil. Cruciferous root vegetables, Ganlan species, leguminous species, Solanaceae, solanaceous vegetables, etc.; the application of phosphate fertilizer has obvious effect of increasing production. The application of phosphate fertilizers on phosphorus-deficient vegetable lands is very effective. Due to the long-term partial application of nitrogen fertilizer, the ratio of nitrogen and phosphorus in the soil is unbalanced, and the application of phosphorus fertilizer to promote nitrogen by phosphorus has obvious effects. Calcium, magnesium phosphate fertilizer and phosphate rock powder should be applied on acidic or acidic soils. Superphosphate is suitable for application on neutral and slightly acidic soils. Also, phosphate fertilizer should not be applied alone. Nitrogen and potassium fertilizers should be added during application, and organic fertilizers should be added. The ratio of nitrogen to phosphorus is generally 3:1 or 2:1. Phosphorus fertilizers and organic fertilizers are mixed and stacked, and the utilization rate can be increased by 10% to 30%.