WANG Jian-dong 1, GONG Shi-hong 1, BAO Zi-yun 2, ZHAO Yue-fen 3

1. Irrigation and Drainage Department, IWHR, Beijing 100048, China;
2. Ningxia Water Resources Research Institute, Yinchuan 750021, China;
3. Beijing IWHR Corporation, Beijing 100048, China

Abstract: In this paper, three-year field study was carried out under the crop rotation of summer maize and winter wheat in no-tillage to investigate the change of soil volume-weight under different water-saving irrigation models, which included two irrigation types and four irrigation schedules. The results show that irrigation types and irrigation schedules have little effect on the change of soil volume-weight during the three years. From the comparison results of variance degree for soil volume-weight during the three years, it is obvious that sufficient basin irrigation has more effect on the soil volume-weight of upper soil (0-30cm) than deficit basin irrigation, and drip irrigation has more effect on the soil volume-weight of 25-70cm layer than on other soil layer. In addition, drip irrigation has more evident effect on the fluctuation of soil volume-weight than basin irrigation under sufficient irrigation, but basin irrigation can improve the degree of packing of the upper soil layer (0-10cm). The results also indicate that irrigation types have little effect on the soil volume-weight of upper soil layer and deeper soil layer (soil depth under 85cm) under deficit irrigation.

Key words: drip irrigation, irrigation types, irrigation schedule, no-tillage, soil volume-weight

Published in: Journal of China Institute of Water Resources and Hydropower Research (Vol. 11 No. 2, 2013)