大白菜是我国重要的蔬菜品种,具有生长快、生育期短、产量高和需肥量大的特点。如果生长期间氮素供应不足,则会植株矮小,组织粗硬,严重减产,如果氮肥施用过多,叶大而薄,包心不实,品质差,不耐贮存。如果后期磷钾供应不足,往往不易结球。与粮食作物相比,农户在实际生产中往往盲目追求高产量高收益过量投入化肥,从而导致大白菜营养失调、品质下降、风味欠佳,同时也带来了肥料利用率 Chinese cabbage is an important vegetable species in our country, with characteristics of fast growth, short growth period, high yield and large amount of fertilizer needed. If the nitrogen supply during growth is insufficient, it will plant short, coarse tissue, severe cut, if too much nitrogen fertilizer, large and thin leaves, unwary, poor quality, intolerance storage. If the late supply of phosphorus and potassium deficiency, often difficult to catch. Compared with the food crops, farmers in the actual production is often blind pursuit of high yield and high yield over-fertilization of fertilizer, leading to cabbage nutrition disorders, quality degradation, poor flavor, but also brought fertilizer utilization