Effect of Shallow Groundwater Table on Vegetable Water Requirement and Water Use Efficiency
According to the vegetable water requirement experiment made in twelve non-weighing lysimeters in 2000-2004,effects of groundwater depths(0.3m,0.6m,0.9m,1.2m,1.5m and 1.8m)on water requirement,groundwater contribution,rainfall usage,crop coefficient,yield and water use efficiency of winter spinach,spring spinach and sweet peppers were analyzed.Results showed that: groundwater contribution decreased with increases of groundwater depth.With the water table at 0.3m depth,winter spinach met 56.2%of its water requirement from groundwater and sweet peppers absorbed 59.80/6 of the water requirement from groundwater.When water table was 1.8m,89.5%,82.4% and 56.6% of the water requirement were obtained from rainfall by winter spinach,spring spinach and sweet peppers respectively.Irrigation was reduced because of the sufficient supply of groundwater and rainfall.Maximum crop yield was obtained with the water table at 0.6m depth and higher water use efficiency was found at 1.5m～1.8m depth as well as at 0.6m～0.9m depth.Generally,water table depth of 0.6m～0.9m was thought to be optimum for all the vegetables studied in this area.These conclusions will be helpful for the establishment of water-saving irrigation model considering the contribution of groundwater and rainfall.
groundwater table crop water requirement water use efficient spinach sweet peppers
Ding Jiali Peng Shizhang Xu Junzeng Qu Yiming Shen Bo
State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering,Hohai University Nanjing Chongchuan Institute of Hydraulic Science,Nantong,226014,China Bureau of Water Conservancy,Nantong,226006,China
国际会议
南京
英文
104-109
2006-08-16（万方平台首次上网日期，不代表论文的发表时间）