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一、露地甘蓝1、存在的主要问题一是不同田块有机肥施用量差异较大,盲目偏施氮肥现象严重,钾肥施用量不足,施用时期和方式不合理。二是施肥存在“重大量元素,轻中量元素”现象,影响产品品质。三是过量灌溉造成水肥浪费的问题普遍,氮肥利用率较低。2、施肥原则(1)合理施用有机肥,有机肥与化肥配合施用;氮磷钾肥的施用应遵循控氮、稳磷、增钾的原则。(2)肥料分配上以基、追结合为主;追肥以氮
First, the exposed cabbage 1, the main problems First, different fields of organic fertilizer application rates vary significantly blind partial nitrogen fertilizer phenomenon, lack of application of potassium, the application period and way unreasonable. Second, fertilization exists, “a large number of elements, light and medium elements ” phenomenon, affecting product quality. Third, excessive water and fertilizer waste caused by irrigation is widespread, lower nitrogen utilization. 2, the principle of fertilization (1) rational use of organic fertilizer, organic fertilizer and chemical fertilizer with the application of nitrogen, phosphorus and potassium fertilizer should follow the principles of nitrogen, phosphorus, potassium. (2) Distribution of fertilizer to base, chase the main combination; topdressing to nitrogen