The method of fertilization for cabbage includes basal fertilizer and top dressing. Basal fertilizer can account for more than half of the total fertilization. Basal fertilizers should mainly be decomposed high-quality organic fertilizers, but also apply appropriate amounts of nitrogen, phosphorus and potassium fertilizers. In addition, fertilizer should be applied several times depending on the nutrient requirements of the plant at different growth stages. Because cabbage can be grown all year round, its fertilization techniques are basically the same. Precocious Spring Cabbage has only 65 to 80 days from planting to harvesting. It is also covered with plastic mulches and small sheds. It can be used to form rosettes in addition to basal fertilizer (37,500 to 45,000 kilograms per hectare of applied manure and some fertilizers). When topdressing, topdressing is mainly nitrogen and potassium fertilizers. Due to the high temperature in the shed and poor ventilation during the early spring facilities cultivation in the north, plants should be prevented from being damaged due to excessive nitrogen fertilizer application. Middle and late cooked cabbage, basal and top dressing are all very important. Basal fertilizer applied 90,000 kilograms per hectare and part of nitrogen fertilizer. Topdressing is carried out in 3 runs: for the first time after planting and easing seedlings, topdressing with a small amount of nitrogen fertilizer is performed; the second time can be performed after the formation of rosette leaves. This is the critical period for top-dressing. The amount of top-dressing fertilizer is more than half of the total amount of top-dressing fertilizer. The third time it can be carried out in the middle of the ball to ensure that the ball is firm, increase production and improve quality. It should be noted that no matter what the cultivation season or cultivation method, water should be promptly applied after topdressing so as to increase the absorption of nutrients by cabbage and give full play to the role of fertilizer. In addition, organic fertilizer should be applied in combination with cultivated land to fully mix the soil fertilizer so as to improve the soil. When topdressing chemical fertilizers, it is better to use ditch application or acupoint application, cover the soil after application, in order to avoid the loss of nitrogen volatilization and reduce the fixation of phosphorus and potassium fertilizers in soil.
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