Determination of rainfed Wheat and Barley Yield Functions With the Agricultural Refrence Index for Drought (ARID) in Golestan Province

Document Type : Original Article

Authors

1 Ph.D. Candidate, Department of Water Engineering, Faculty of Agriculture, Bu-Ali Sina University, Hamedan, Iran

2 Associated Professor, Department of Water Engineering, Faculty of Agriculture, Bu-Ali Sina University, Hamedan, Iran

3 Professor, Faculty of Natural Resources and Environment and invited prof. of Dept of Water Eng., Ferdowsi University of Mashhad., Mashhad., Iran

Abstract

Drought as an inevitable consequence of weather variables is one of the main causes in decline of agricultural yields spatially in rainfed condition. In this study the Agricultural Reference Index for Drought (ARID) including one layer and two layers of soil water balance approaches were used to estimate the yield functions of rainfed wheat and barley in Golestan province. For this purpose the daily metrological variables form 12 weather stations during hydrological years were obtained and then the values of ARID according two mentioned approaches in the growth period of wheat and barley were calculated. In addition to the values of wheat and barley yield production in irrigated (Yp) and rainfed (y) condition for eight city of Golestan province in corresponding time were gathered and by using change point analysis the time series of relative yield for each crop were estimated. By considering six phonological growth period for investigated crops, the average values of ARID droning different years were calculated and by nonlinear solving of relation between relative yield and ARID the sensitivity coefficients to water stresses for each periods and the function of crop yields were determined. Finally evaluated the ability of ARID in two approaches by compared the predicted and observed crop yields according to statist criteria. According to these the results of ARID based on two layer of water soil balance model have a better efficiency in estimating of wheat and barley yields. In addition the accuracy of barley yield function is more than wheat yield function. Investigation the sensitivity coefficients of given crops indicated that the most sensitive period for rainfed wheat and barley in all given stations expect of Ramian Town stations was stem elongation (stage 3) period and the order of sensitivity coefficients for period of initiation stage, booting stage and flowering to water stresses were different according to kind of crops and stations but the two less sensitive periods to water stress were obtained for initiation vegetative and ripping periods.

Keywords


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