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缺氮主要表现为植株矮小瘦弱,生长缓慢,分蘖少而弱,叶片窄小直立,叶色淡黄绿色,老叶叶尖干枯。逐步发展为基部叶片枯黄,茎有时呈淡紫色,根系不发达,根数少而短,穗少穗小,成熟期提前,产量低的情况。补救措施:苗期、返青期缺氮,每亩可追施尿素7~8千克,或碳铵20~25千克,或人粪尿600~700千克在行间沟施或对水浇施;拔节期再追施尿素10~15千克。对于抽穗后叶色变
Nitrogen deficiency is mainly manifested as short and thin plants, slow growth, less and less tillering, narrow erect leaves, leaf color yellowish green, the old leaf tip dry. Gradually developed into a base of yellow leaves, stem sometimes lavender, underdeveloped roots, short roots, spike spike small, early maturity, low yield. Remedy: Seedling, youth green, nitrogen can be topdressing urea per acre 7 to 8 kg, or ammonium bicarbonate 20 to 25 kg, or human waste 600 to 700 kg in the inter-row ditch or watering facilities; jointing Time to pursue urea 10 to 15 kg. After heading for leaf color change