花白苗病 1.产生原因 (1)土壤中有效磷含量低,这是产生玉米花白病的根本原因。 (2)土壤缺锌。这是由于长期单一施用氮、磷化肥,而忽视了农家肥的使用所致。 (3)玉米多年重茬种植,由于锌肥供应不足,而导致花白苗病发生。 (4)在甜菜、白菜、荞麦等“凉茬”地上种植玉米所致。 Spearman’s disease 1. Causes (1) low available phosphorus in the soil, which is the fundamental reason for producing white corn disease. (2) zinc deficiency in soil. This is due to long-term single application of nitrogen and phosphorus fertilizers, while ignoring the use of farmyard manure. (3) Corn stubble planting for many years, due to lack of zinc supply, which led to the occurrence of flower white seedling disease. (4) Beet, cabbage, buckwheat, etc. “stubble ” ground planting corn.