Second, early Miao Miao. Early application and indiscriminate application of seedlings, timely supply of nutrients needed for rapeseed seedlings, utilization of short-term higher temperatures before winter, to promote the growth of rapeseed, to achieve strong seedlings overwinter, lay the foundation for high yield and stability of rapeseed production. Miao Fei can be divided into two pre-emergence and post-emergence fertilizer. The early seedling fertilizer is applied at the time of setting seedlings or 5 true leaves. Generally, 5-6 kg of urea is applied per acre. In a soil with phosphorus and potassium deficiency, if the base fertilizer is not applied with phosphorus and potassium fertilizers, phosphorus and potassium fertilizers should be supplemented; Seedlings and climate may vary. Generally, 8-10 kg of high-nitrogen compound fertilizer is applied per acre. Strong spring varieties or warmer winter seasons should be applied early. Low winter temperatures or three ripe rape fields can be applied late. Third, steadily apply fertilizer. The rapeseed period is the period of vegetative growth and reproductive growth. The rapid twitching of plants, long branches, increased leaf area, and large number of flower buds are the most demanding periods for fertilization. Therefore, according to the application of base fertilizer, seedling fertilizer and the growth situation, it is appropriate to apply fertilizer. The base and seedlings are sufficient, and the plants grow robustly, and less or no fertilizer is applied. If the base and seedlings are insufficient, there is a trend of defertilization that should be applied early. Generally, 15-20 kg of high-nitrogen compound fertilizer is applied per acre. The fertilization time is generally mid-tethering, with 15-30 cm in height. However, weak growth can be fertilized at the initial stage of convulsions to prevent premature senescence; strong growth can be applied at the late stage of convulsions and 30-50 centimeters high to prevent the closure of canopy. Fourth, Qiao Shi Hua Fei: rape after bolting flowering side scab, seed number and grain weight and flowering after the nutritional conditions are closely related. For vigorous growth, fertilizers with large amount of fertilizer in flood season can be applied or not applied; not applied to early maturing varieties, or applied less in the initial flowering period; spraying fertilizer in foliar stage can be applied in the flowering stage, spraying 0.1-0.2% in the period of blooming and scabbing. Urea solution or 0.2% potassium dihydrogen phosphate solution. In addition, a 0.2% borax solution may be sprayed once in the post-emergence and convulsive stages to prevent “flowering†and increase yield.
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Rape fertilization technology
First, apply base fertilizer. Rapeseed plants are tall and require a large amount of fertilizer, and should pay attention to the application of basal fertilizer, lack of basal fertilizer, thin seedlings, and thus affect the growth of plants and even the economic yield of rapeseed. Basal fertilizer is dominated by organic fertilizers, supplemented by chemical fertilizers, which lays the foundation for rape to need fertilizer for a lifetime. In general, 2000 kg of organic fertilizer per acre Shisuong, 25-30 kg of 45 percent compound fertilizer, or 36 percent of compound fertilizer (15-10-11) 30-40 kg, 0.5-1 kg of boron fertilizer. Application method: Combine ploughing and soil preparation to deepen organic fertilizer, compound fertilizer and boron fertilizer. Never avoid excessive fertilization due to ploughing.