干旱区生态环境知识资源中心

In order to explore the water-saving irrigation pattern of direct rice for high yield and excellent quality under no-tillage after wheat, the research was carried out on the experimental farm of Yangzhou University in the year 2005, which selected Wuxiangjing 14 and Lianjiajing 1 as the experimental cultivar. The semi-arid irrigation and general irrigation regime were employed under 3000 thousand basic seedling per hectare with Lianjiajing 1 and wuxiangjing 14. The productivity was similar between the two types of irrigation regime. There was no remarkable difference on the yield components, leaf area index, photosynthesis potential, net assimilation rate, and dry matter at different stage, milling quality and appearance quality, the cooking quality and nutrition quality. But all these aspects in the semi-arid irrigation treatment had a trend of decrease. The rice under semi-arid irrigation regime was strong; their leaves color were light, and the N content of the stem and grain were lower than those of conventional irrigation regime. Semi-arid irrigation saved the amount of water by one third, compared with the general irrigation regime. On the basis of the research, semi-arid irrigation with appropriately improved seeding pattern under no-tillage after wheat could be one of approaches to gain high yield and excellent quality, but the best combination need to be confirmed through further experiments.