1.缺氮症状叶色淡绿,叶片薄而小,易早落。枝蔓细而短,停止生长早。果穗、果粒小。矫治方法秋施基肥时混以无机氮肥;生长期追施速效氮肥2～3次;叶面喷施0.3%～0.5%尿素水溶液。2.缺磷症状初期叶片呈深绿色,叶脉呈红褐色或紫色,随后叶片正面变为红褐色。矫治方法基肥施用农家肥、 1. Nitrogen deficiency leaf color light green, thin and small leaves, easy to fall early. Branches thin and short, stop growing early. Ear, small fruit. Correction methods autumn base fertilizer mixed with inorganic nitrogen fertilizer; growth of topdressing available nitrogen fertilizer 2 or 3 times; foliar spray 0.3% ~ 0.5% aqueous urea solution. 2. phosphorus deficiency symptoms early leaves dark green, veins reddish brown or purple, then the leaves become red-brown front. Correction method basal application of manure,