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玉米是高产作物,其增产潜力很大,必须足量适期施肥。才能发挥出良种高产潜力,当前投肥不足,施肥不讲科学,仍是限制玉米产量提高的重要因素。玉米使用化肥总量,按每生产100kg籽粒使用纯氮(N)3kg、磷(P_2O_5)1kg、钾(K_2O)2kg计算。667m~2产500～600kg籽粒,需纯氮(N)15～18kg、磷(P_2O_5)5～6kg、钾(K_2O)10～12kg。即折尿素(N46％)33～39kg、磷肥(P_2O_512％)42～50kg、钾肥(K_2O50％)20～24kg。另外每667m~2再加施硫酸锌1kg和有机肥1000kg以上。 玉米追肥必须掌握时期、次数和数量,要根据玉米需肥规律、产量指标、地力基础、施肥数量等情况综合考虑,磷肥、钾肥、锌肥和有机肥肥效长,可以作基肥或苗肥一次施入。氮肥追肥分三种情况:一是高产田,地力基础好,追肥数量多,最好采取轻追苗肥、重追穗肥、补追粒肥的三次追肥法。苗肥用量约占总追氮量的30％,一般在定苗
Maize is a high-yielding crop with a great potential for increasing yield and adequate amount of fertilizer must be applied. In order to play the potential of high yielding varieties, the current lack of fertilizer, fertilizer does not speak science, is still an important factor limiting the yield of corn. The total amount of chemical fertilizer used for corn is calculated using 3kg of pure nitrogen (N), 1kg of phosphorus (P2O5) and 2kg of potassium (K2O) per 100kg of grain. 667m ~ 2 produce 500 ~ 600kg grain, pure nitrogen (N) 15 ~ 18kg, phosphorus (P_2O_5) 5 ~ 6kg, potassium (K_2O) 10 ~ 12kg. That is, 30-39kg of urea (N46%), 42-50kg of phosphate fertilizer (P2O512%) and 20-24kg of potash fertilizer (K2O50%). In addition, every 667m ~ 2 together with zinc sulfate 1kg and organic fertilizer more than 1000kg. Corn topdressing must master the times, times and quantities, according to the laws of corn fertility, yield indicators, foundation of geography, quantity of fertilizers and so on. Phosphate fertilizers, potash fertilizers, zinc fertilizers and organic fertilizers can be used as a fertilizer Into. Nitrogen fertilizer top-three cases: First, high-yielding fields, good ground-based, topdressing quantity, it is best to take the light to catch up with Miao Fei, heavy chase spike fertilizer, fill chase fertilizer three times dressing method. Miao fertilizer accounts for about 30% of the total amount of nitrogen, usually in Dingmiao