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在吉林省玉米高产区,公顷产量由原来的7000～8000kg提高到11000多公斤,是种植耐密型高产品种,合理密植、增施肥料、精耕细种、加强田间管理等措施综合作用的结果.其中品种的增产作用是主要的,适宜密度因品种而异,即中晚熟、晚熟、中、大穗型品种,公顷6.0万株左右,中熟、小穗型品种7～8万株;在施肥上,应增施氮肥、补施钾肥,公顷施氮量应增加到220～230kg,钾(K_2O)应补施到70～150kg,磷(P_2O_5)要保持原来75～80kg即可;采用综合措施,将田间小穗株率控制在5%以内.
In the high-yielding maize area of Jilin Province, the output of hectare is increased from 7000-8000kg to more than 11000kg, which is the result of comprehensive effect of planting high-yielding and high-yielding varieties, close planting, fertilizing, precision cultivating and strengthening field management , Of which the increasing effect of breed is the main one, and the suitable densities vary with breed, namely the middle-late-maturing, late-maturing, middle and big spike breed, about 60,000 hectares and about 70,000 to 80,000 mid- Fertilization, nitrogen should be increased, potassium fertilizer, hectare of nitrogen should be increased to 220 ~ 230kg, potassium (K_2O) should be re-applied to 70 ~ 150kg, phosphorus (P_2O_5) to maintain the original 75 ~ 80kg can be; Measures to control the rate of field spikelets within 5%.