Evaluation of water uptake reduction functions under conjunctive salinity and water stress conditions (Case study: Wheat, Birjand, Iran)
Publish place: The 3nd International Conference on Architecture, Civil Engineering, Agriculture and the Environment
Publish Year: 1398
نوع سند: مقاله کنفرانسی
زبان: English
View: 571
This Paper With 11 Page And PDF Format Ready To Download
- Certificate
- من نویسنده این مقاله هستم
استخراج به نرم افزارهای پژوهشی:
شناسه ملی سند علمی:
ACAECONF03_005
تاریخ نمایه سازی: 8 مهر 1398
Abstract:
Plants often experience both drought and salinity stress in arid environment. Various mathematical water uptake models exist for plants response to combined drought and salinity stress. The reduction functions are classified as additive, multiplicative and conceptual models. In this study six different macroscopic reduction functions, namely; Van Genuchten (additive and multiplicative), Dirksen et al., Van Dam et al, Skaggs et al and Homaee were evaluated. The experiment was carried out on Roshan variety of wheat crop in a factorial split plot design with 3 replicates in the Research Field of university Birjand. The treatments consisted of four levels of irrigation (50, 75, 100 and 120%of crop water requirement), and three water qualities (1.4, 4.5, 9.6 dS/m). The results of this study indicated that the additive model estimates relative yield less than actual amount. In other word, the effect of combined stresses on wheat yield was less compared to sum of the separate effects due to salinity and water stress. The effect of drought stress on reduction of yield was more than salinity stress. The results also revealed that reduction function of Skaggs et al and Homaee were better fitness to measured data than the other functions.
Keywords:
Authors
Mohamad Javad Nahvinia
Assistant Professor, Department of Water Sciences and Engineering, Faculty of Agriculture and Natural Resources, Arak University
Saeed Sharafi
Assistant Professor, . Department of Environmental Science and Engineering, Faculty of Agriculture and Natural Resources, Arak University
Javad Mozafari
Assistant Professor, Department of Water Sciences and Engineering, Faculty of Agriculture and Natural Resources, Arak University