Soil Spatial Variability Considerations in Salt Emission and Drainage Reduction

摘要

The applied research, as reported here, emphasizes the importance of prior knowledge of soil properties and their field variability. This is in contrast to other studies that are directed at improving irrigation efficiency through increased water application uniformity. Although this is important, an equally important factor is soil variability and how it affects infiltration, water storage, deep percolation and plant growth and development. The original proposal listed the following three objectives: (1) To determine if soil spatial variability considerations in drainage and irrigation management reduce mass emission of salts through deep percolation or drainage, (2) To analyze and simulate the influence of cracked soils on water infiltration, salt distribution and groundwater level response, and (3) To determine if the costs of the proposed irrigation management practices, including intensive soil sampling, are acceptable from an engineering and economic point of view.