一、小麦缺素症症状1.缺氮型黄苗:主要表现植株矮小细弱,分蘖少,叶片窄小直立,叶色淡黄绿,老叶叶尖干枯,然后由叶尖开始向下干枯,并逐渐向上部叶片发展。基部叶片枯黄,茎有时呈淡紫色,植株矮小,分蘖少,根数少,根量小,穗数少,成熟早,产量低。2.缺磷型红苗:叶片暗绿,带紫红色,无光泽,植株细小,分蘖少,次生根极少,茎基部呈紫色。前期生长停滞,出现缩苗。冬前返青期叶尖紫红 First, the symptoms of wheat deficiency syndrome 1. Nitrogen deficiency yellow seedlings: The main performance of plants short and thin, less tillers, leaves narrow and erect, leaf color yellowish green, leaf tip dry, and then began to dry down from the tip, And gradually to the upper leaf development. Basal leaves yellow, stem sometimes lavender, short plants, fewer tillers, fewer roots, small roots, spikelets less, mature early, low yield. 2. Phosphorus-deficient red seedlings: dark green leaves, with purple, dull, small plants, fewer tillers, few secondary roots, the base of the stem was purple. Pre-growth stagnation, shrinking seedlings appear. Rejuvenation before winter tip purple