Abstract: A field experiment was conducted on the Earth-Cumulic-Orthic Anthrosols in south Loess Plateau to investigate the effects of nitrogen fertilization, cultivar,and cultivation mode on the leaf area index (LAI), diffuse non-interceptance (DIFN), and grain yield of winter wheat. The results showed that during the growth period, LAI increased first and decreased then, which was the highest in flowering but the lowest in maturing stage. Nitrogen fertilization improved the LAI sign ificantly. DIFN had a change pattern reverse to LAI. There were significant diff erences in LAI and DIFN among cultivars. The LAI under plastic-film mulching fo r whole growth period (PFMW) and plastic-film mulching for 150d (PFMD) was significantly higher than that under other three cultivation modes, while DIFN was in reverse. Nitrogen fertilization increased grain yield significantly. The grain yield under PFMW, PFMD, and rainfall harvest cultivation was higher than that under other two cultivation modes, but from the viewpoints of grain yield, canopy parameters, and soil quality, PFMW and PFMD were better than the other three cultivation modes.

Key words: Shelterbelt/windbreak, Direction of shelterbelt, Spacing interval between shelterbelts, Shelterbelt structure, Arrangement