According to the growth of manure and nutrient supply capacity of cabbage, combined with the actual level of current fertilization of cabbage, a comprehensive analysis was conducted to determine the amount of fertilizer: (1) 8000 kg of medium- and high-yield late-maturing varieties were selected, and Mushi quality farmyard fertilizer was 7,500 kg. Nitrogen 23 kg, Phosphorus 10.5 kg, Potassium 15 kg; (2) 6000 kg medium-sized land, selected early maturing cultivars, Mushi quality farmyard fertilizer 6500 kg, Nitrogen 20 kg, Phosphorus 9 kg, Potassium 13 kg; (3) Target production of lower grade, Generally choose early maturing, early maturing varieties, Mushi farmyard fertilizer 5000 kilograms, nitrogen 16 kilograms, phosphorus 3 kilograms, potassium 9 kilograms.
Second, fertilization technology
(1) Apply base fertilizer. Chinese cabbage grows for a long period of time and requires a lot of high-quality organic fertilizer with long-term fertilizer effect. Therefore, it is very important to use a large amount of manure as a base fertilizer. General Mushi not less than 5000 kg. Before planting land, firstly spread 60% of the manure into the ground and deeply plunge into the soil. Put 40% of the manure on the ground before entering the ground and plunge into the shallow soil. Then add calcium phosphate or compound fertilizer should be applied along with the application of manure. Amount of 50 kg to 75 kg per mu.
(2) planting seedlings to raise seedlings. In order to ensure sufficient nutrient for the seedling period, it is necessary to chase the quick-acting fertilizer to “raise seedlingsâ€. Ammonium nitrate is used between 5 kg and 8 kg per mu, and it is applied to the sowing hole before the live broadcast. The groove is fully mixed with the soil and then watered for sowing.
(3) Fat tree fat. The rosette leaves produced in the rosette stage are the organs that will produce photosynthetic products in large amounts in the future. Fertilization and watering is the key to ensure the robustness of the rosette leaves. But at the same time, we must also pay attention to prevent the rosette leaves from becoming long and lead to delaying the heart. "Farming tree fat" should be applied when a few plants in the field begin to plant trees. Generally, 800 to 1500 kilograms of manure will be applied, 50 to 100 kilograms of plant ash, or 10 to 15 kilograms of ammonium nitrate. Each of phosphorus and potash fertilizer 7 Kg - 10 kg. Live cabbage should be placed on the edge of the plant 8 cm -10 cm into the ditch fertilizer and cover the soil. For transplanted cabbage, the fertilizer is applied to the ditch, and the soil is mixed and then planted. If there is a phenomenon of leggy growth in the later period of the rosette, the seedlings must be taken.
(4) ball fertilizer. Fertilizer is a period of product formation and has the most powerful assimilation. Therefore, a large amount of fertilizer is required. The complete fertilizer with long-lasting fertilizer effect is applied between the 5th and 6th days before the core of the package. In particular, potassium fertilizer should be added, and the "Hongjie" brand vegetable special fertilizer can be used in combination. General Mushi ammonium nitrate 20 kilograms, superphosphate and potassium sulfate each 10 kilograms - 15 kilograms, plant ash 50 kilograms - 100 kilograms for ball fertilizer. For lasting nutrients, it is advisable to mix chemical fertilizers with decomposed manure, and apply 5 cm to 10 cm deep furrows between rows. This dressing has the effect of enriching the inside of the leaf ball and promoting irrigation. It is also called filling heart fertilizer.
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