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一、缺氮马铃薯缺氮,植株生长发育不良,根系发育受阻,致使植株矮小,生长缓慢,叶色淡绿,叶尖卷曲而严重减产。防治马铃薯缺氮,应在施好底肥的同时,施好芽、苗肥,即在马铃薯将要齐苗时,亩用尿素3—4公斤,兑清粪水沟施或穴施。若现蕾前缺氮,则亩用1—2％的尿素液50—60公斤叶面喷施。二、缺磷马铃薯缺磷,植侏矮小,叶面皱缩,叶柄和小叶向上直立生长,光合作用减弱,块茎不但产量低,而且易空心,薯肉有锈斑.硬化煮不粑.严重影响食用品质。防治马铃薯缺磷,底肥必须以有机肥为主,配施磷肥。若开花前缺磷,则亩用过磷酸钙6公斤,兑清粪水沟施或穴施;若开花后缺磷,可根外喷施1—2％
First, the nitrogen-deficient potato nitrogen deficiency, poor plant growth and development, obstruction of root development, resulting in short plants, slow growth, leaf color light green, leaf tip curly and serious yield. Prevention of nitrogen deficiency in potatoes should be applied at the same time, good buds, Miao Fei, that is, when the potato will be Qi Miao, mu with urea 3-4 kg, against the manure Drainage facilities or facilities. If the bud before the nitrogen deficiency, the mu with 1-2% urea 50-60 kg foliar spray. Second, phosphorus deficiency of phosphorus-lack of potatoes, planting small dwarf, foliar folds, petiole and leaflets upright growth, weakened photosynthesis, tubers not only low yield, but also easy hollow, potato meat rust stains. quality. Prevention of phosphorus deficiency in potatoes, base fertilizer must be based on organic fertilizer, with phosphate fertilizer. If the flowering before phosphorus deficiency, the mu with superphosphate 6 kg, against the manure ditch Shi or hole facilities; if the flowering after phosphorus deficiency, the root spray 1-2%