Abstract: Some physiological indexes for high yield cultivation of summer corn were studied with different population of variety "Yedan 22".The results indicated that to extend the duration of leaf function at filling period especially the time of green leaf area at the period following 30-day after silking was essential to ensure high yield while leaf area index was within reasonable range.Based on increasing the dry matter accumulation of whole growing period,increased yield could be obtained mostly by increasing the amount of dry matter accumulation at 10 to 30 day period after flowering,especially after silking.There was a curevilinear relationship between the maximum bleeding amount and grain yield.So,to improve yield,the maximum bleeding amount should be maintained reasonable.

Key words: Summer corn, Yield, Population, Physiological index

CLC Number: 

• S513.01