关键词: 夏玉米, 栽培模式, 产量, 抗倒性, 洞庭湖区

Abstract: Three densities（60 000，75 000，90 000 plants/ha），three nitrogen application levels（150，225，300 kg/ha）and two chemical control treatments（no chemical control，chemical control）were set，and combined into seven cultivation patterns，including T1（high density，high nitrogen and chemical control），T2（high density，medium nitrogen and chemical control），T3（high density，low nitrogen and chemical control），T4（medium density，high nitrogen and chemical control），T5（medium density，medium nitrogen and chemical control），T6（medium density，low nitrogen and chemical control）and CK（low density，high nitrogen and no chemical control）.The effects of different cultivation patterns on the yield and lodging resistance of summer maize varieties Zhengdan 958 and Xiangnongyu 27 were studied，so as to clarify the suitable cultivation pattern for summer maize in Dongting Lake area. The results showed that the yield of Zhengdan 958 was higher than that of Xiangnongyu 27 on the whole，and the yields of the two varieties in 2 a were higher in T1 and T2 patterns，and the difference between the two treatments was not significant.Compared with CK，the plant height and ear height of each pattern significantly decreased，and the stem diameter roughly decreased. There were significant differences in the number of airborne layers among the patterns，the T1 and T2 patterns were more for Zhengdan 958，and the T4 and T5 patterns were more for Xiangnongyu 27.The change rules of stem puncture strength and compressive strength were not obvious，but showed differences between varieties and between years. No plant lodging and folding occurred in 2 a tests.In conclusion，by rational allocation of nitrogen application rate，planting density and chemical control measures，lodging resistance and high yield of summer maize could be achieved.The T2 pattern is the ideal cultivation mode for summer maize in Dongting Lake area under the present experimental conditions.

Key words: Summer maize, Cultivation pattern, Yield, Lodging resistance, Dongting Lake area