【摘要】 <正> 麦茬复种夏玉米,是华北平原常见的种植方式。它具有高产、省工和便于机械化等优点,符合农村商品化和专业化生产的发展方向,面积日益扩大。为发挥夏玉米的增产潜力,我们于1978年开始对它的生育规律进行了系统观察,并在此基础上进而研究其高产生育模式及控制措施。更多还原

【Abstract】 According to the analysis of data obtained from 66 high-yielding summer maize experimental plots, we suggest that the development model of 1,000 jin/mu yield of maize should be as follows: Harvest 4,000 plants/mu, maximum LAI 3.5-4.0, biological products about 2,100 jin/mu, economical coefficient about 0.5, 4,200-4,400 ears per mu, 440-460 kernals/ear^-1, 1.000 kernal weight above 270g. The plant population of high yield should develop along rational biological order throughtout the growing season. Strong seedlings and early development in the early growing stage are necessary, Rapid lister covering and silking are desired. The LAI should be maintained above 3.0 as long as possible after it had reached the highest peak. The whole growing period should be about 100 days, and no less then 46 days from silking to maturity. Early sowing, reasonable close planting, timely irrigation and fertilizer application etc are important to obtain the desirable high yield of the model.更多还原