Using saline water for wheat production and investigation of accumulation solute trend in soil profile
2008
Kiani, A., Assistant Professor, Agricultural and Natural Resources Research Center of Golestan Province, Gorgan, Iran | Asadi, M. E., Assistant Professor, Agricultural and Natural Resources Research Center of Golestan Province, Gorgan, Iran
Study of crop response to water stress, salinity and long-term effects of using saline water in soil profile are necessary. Wheat yield was evaluated under different values of water qualities and quantities, in order to evaluate salt distribution in the soil profile SWAP model was run 10 years. The experiment was conducted in a RCBD times in a split-plot arrangement with three replications. The main-plots were four irrigation water levels 50 (W1), 75 (W2), 100 (W3) and 125 (W4) % of crop water requirements. The sub-plots were four irrigation salinity levels 1.5 (S1), 8.5 (S2), 11.5 (S3) and 14.2 (S4) dS/m. The results revealed that the yield reduction for W2 treatment was 9 % as compared to W3 treatment and that for S2 treatment was 10 % as compared to S4 treatment. Increasing soil salinity at the harvest time may be caused by the use of saline water, but rainfall can be decreased soil salinity in the next pre-sowing stage of wheat. Long-term simulation of solute transport in soil using SWAP model indicated that soil salinity could be gradually increased, as a result of using saline water. This implies that rainfall alone can';t completely provide leaching requirement. In order to have a sustainable agriculture, in every four years of using saline water, the soil must leach with non-saline water before sowing to wheat crop. Key words: Saline water, Deficit irrigation, SWAP model, Wheat, Golestan
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