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对 50年代以来生产上大面积推广的主要玉米品种的研究表明 :随着玉米品种的更替 ,群体光合速率增强 ,群体光合衰减率降低 ,呼吸消耗所占总光合的百分率下降。灌浆期当代品种中、下部叶片的群体光合速率明显高于老品种。种植密度是影响玉米群体光合速率的主要因素 ,在高、中、低三种密度条件下 ,当代品种均有较高的群体光合速率 ,表现出耐密性强、适应性广、源足库大产量高的特点。
The research on the main maize varieties promoted widely since 1950s showed that with the replacement of maize varieties, the photosynthetic rate of population increased, the photosynthetic decay rate of population decreased and the percentage of total photosynthesis of respiration decreased. The photosynthetic rate of middle and lower leaves of contemporary cultivars at grain filling stage was significantly higher than that of old ones. Planting density was the main factor affecting the photosynthetic rate of maize population. Under the conditions of high, medium and low density, the contemporary varieties had higher population photosynthetic rate, showing strong tolerance, wide adaptability, High yield characteristics.