补氮小麦缺氮的表现植株矮小瘦弱,生长缓慢,叶片狭窄、叶色淡绿,严重时叶片由基部向上变黄,尖端干枯致死,多无分蘖,次生根数目少,茎秆细弱矫正技术苗期缺氮,可追施尿素;返青期缺氮,每亩可追施尿素5千克,拔节期再追施10～15千克补磷缺磷的表现麦苗生长缓慢,叶色呈现暗绿色,无光泽,新叶蓝绿、叶尖紫红,茎秆柔弱,少分蘖,根系发育不良,抽穗扬花时间推迟这样的小麦空秕率增加,千粒重下降矫正技术苗期缺磷,每亩可追施过磷酸钙35～40千克;中后期缺磷,在孕穗扬花初期每亩 Nitrogen deficiency Nitrogen deficiency plants are short and thin, slow growth, narrow leaves, leaf color light green, severe yellow leaves from the base up, the tip dry death, no tillers, less number of secondary roots, thin stalk correction technology seedlings Nitrogen deficiency, can be topdressing urea; greening period of nitrogen deficiency, per acre topdressing urea 5 kg, jointing 10 to 15 kg at the jointing stage to make up for phosphorus deficiency and phosphorus performance slow growth of wheat seedlings, the leaves appear dark green, dull , New leaves blue-green, purple leaves, weak stems, less tillers, root system dysplasia, heading and flowering time to delay such an increase in the empty rate of wheat, 1000-grain weight correction technology seedling lack of phosphorus, per acre topped with calcium phosphate 35 to 40 kg; lack of phosphorus in the late, early in the booting flowering mu