Evaluating Yield Reduction Functions under Salinity and Water Stress Conditions

Document Type : Research Paper

Authors

1 Research Staff, Agricultural and Natural Resources Research Center of Golestan Province, Gorgan, Iran. Associate professor, Soil Science Department, and Assistant professor, Irrigation and Drainage Department, Respectivley, Tarbiat Modares University, Theran, Iran.

2 Associate professor, Soil Science Department, and Assistant professor, Irrigation and Drainage Departmen

3 Respectivley, Tarbiat Modares University, Theran, Iran

Abstract

Various water uptake models have been developed under salinity and water stress conditions. These models can be considered as useful tools in irrigation scheduling and management, because often they predict reliable crop response under stress conditions. Simulated relative yield of wheat from the five macroscopic water uptake models (Van Genuchten (additive and multiplicative), Dirksen et al., Van Dam et al. and Homaee) were evaluated against the measured results from field experiment that had been conducted during the wheat growing season of 2002 and 2003 north of Gorgan. The treatments consisted of four water quantities 50 (W1), 75 (W2), 100 (W3) and 125 (W4) percent of crop water requirement and four water qualities 1.5 (S1), 8.5 (S2), 11.5 (S3) and 14.2 (S4) dS/m. The experiment was laid out in a randomized complete block design with split plot plan with three replications. It was found that the yield decrease under combined salinity and water stress was additive. However, the effect of osmotic potential on wheat yield was not the same as matric potential. The effect of combined stresses on wheat yield was less compared to sum of the separate effects due to salinity and water stress. The results also indicated that reduction function of Homaee's model was more accurate than the other functions. 

Keywords

References

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Iranian Journal of Soil Research
Volume 20, Issue 1
May 2006
Pages 71-78

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