Fertilization technology of broccoli in open field
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Nutritional preparation: Cauliflower has weak root system during germination, and needs nutrient soil with sufficient nutrients, good permeability and sufficient water content. When the seedlings are seedling, the roots have increased adaptability, and the nutrient soil needs certain viscosity to prevent secondary seedling or colonization. Time is diverging. Therefore, when formulating nutritionists, it is advisable to use 4 parts of garden soil that has not been planted with cruciferous crops within 2 to 3 years, 4 parts of decomposed horse manure or chicken manure, and 2 parts of peat or Chen furnace slag. For each cubic meter of nutrient soil, 2 to 3 kg of compound fertilizer and 10 to 20 g of borax should be added. When the seedling nutrient soil is prepared, it uses 4 parts of decomposed horse dung or chicken manure and 6 parts of garden soil to increase the viscosity of the nutritionist. If the nutrient soil is too sticky, the proportion of organic fertilizer should be increased appropriately. Add 3 to 5 kg of compound fertilizer per cubic meter of nutrient soil, and 20 to 40 g of borax. After the nutrient soil is prepared, the nutrient bowl or seed bed can be divided and planted in time. Seedlings should be timely divided into 3 to 4 true leaves after emergence. The spring seedlings are mainly heat preservation, and the seedling age is about 70 days. The autumn seedlings are in the high temperature season. The seedbed should be mainly shaded, cooled, grass-proof and disease-preventing, and the seedling age is about 40 days.
2 heavy application of base fertilizer, timely planting: In order to meet the demand for fertilizer and water in the broccoli growing season, generally choose fertile, loose, water-preserving and fertile loam, deep turning about 30 cm. Combine cultivated land, apply or ditch with decomposed organic fertilizer. In the early spring, the cultivation period is short, and about 45,000 kilograms of organic fertilizer can be applied per hectare, 450 kilograms of compound fertilizer, 750 kilograms of ash, and 750 grams of borax. If the soil is deficient in molybdenum, 150-300 grams of ammonium molybdate per hectare is applied, first dissolved in water and then mixed with organic fertilizer. When the ground temperature in spring is above 5 °C, it can be colonized.
3 skill application of top dressing: After planting the seedlings, combine the water and the seedling water to apply the decomposed mature dung water once, 750 kg per hectare. Cultivate seedlings to promote the development of roots and flower bulbs. When the diameter of the flower ball is 3 to 5 cm, the seedlings are finished, and the water is topdressed in time. During the expansion of the whole flower ball, the soil should be kept moist. Generally, the water is poured once every 5 to 7 days, and the fertilizer is chased once every 10 to 15 days. Each time, the decomposed cake fertilizer or manure fertilizer is 1500 kg/ha, and it is matched. Application of nitrogen, phosphorus and potassium compound fertilizers, and spraying 0.3% potassium dihydrogen phosphate, 0.05% borax, or 0.01% ammonium molybdate to prevent premature aging, improve yield and quality of flower balls.