Abstract:

In order to understand the coupling effect of irrigation and nitrogen in late stage on nitrogen metabolism and yield of maize, field experiment was carried out to research effects of irrigation on nitrate reductase (NR) and glutamine synthetase (GS), and yield of summer corn under different nitrogen levels. The results showed that nitrogen fertilizer and irrigation could increase NR activity in ear leaves, whereas GS activity showed obvious decrease following nitrogen fertilizer application. The different of the GS active under irrigation treatment and the natural precipitation treatment was small. Under the same irrigation condition, the yield increased following nitrogen application, and under the same nitrogen condition, the yield of irrigation treatment was higher. The extent of increased yield by nitrogen fertilizer was higher than irrigation.