Abstract: Erect and plane varieties of corn have a leaf inclination of 65癮nd 50癮nd their optimum planting densitiesare 75000-82000 and 52500-60000 stems穐a^-1.The leaf area index at ear sprouting stage and leaf area day(LAD) for the former are respectively 5.5-6.0 and 360-400,while those for the latter are 3.5-4.0 and 260-300. The LAD ratioes are found to be 3.8,28.1%,58.6% and 11.3% in intervals from emergence to elongation stage,elongation to ear sprouting stage,ear sprouting to milk stage and milk to mature stage with optimum mass structure of the crop.

Key words: intercropping system, cropland, water use efficiency, water-saving mechanism, resources utilization.