Determination of soybean yield gap and potential production in Iran using modeling approach and GIS |
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| Authors: | Alireza NEHBANDANI Afshin SOLTANI Ali RAHEMI-KARIZAKI Amir DADRASI Faranak NOUBAKHSH |
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| Affiliation: | 1 Department of Plant Production, Gorgan University of Agricultural Sciences and Natural Resources, Gorgan 4918943464, Iran 2 Department of Plant Production, Gonbad Kavoos University, Gonbad Kavoos 4971799151, Iran 3 Department of Agronomy, Agricultural Science, Vali-e-Asr University of Rafsanjan, Kerman 7718897111, Iran 4 SWEP Analytical Laboratories, Melbourne, Victoria 3173, Australia |
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| Abstract: | Increasing crop production is necessary to maintain food security for the growing global population. Reducing the gap between actual and potential yield is one of the important ways to increase yield per unit area. Potential yield and the yield gap of soybean were determined for Golestan Province, Iran, using Soybean Simulation Model (SSM-iCrop2) and Geographical Information System (GIS). Information from 24 weather stations and soil data of the region were used. Yield gap and production gap were calculated at county and province levels. The average actual yield of soybean in this province was 2.28 t ha–1 while the province’s potential yield was 4.73 t ha–1, so the yield gap was estimated 2.44 t ha–1. Thus, there is a great potential for increasing soybean yield in Golestan, which is possible through improving crop management of soybean in farmers’ fields. The average water productivity of soybean was estimated to be 0.81 kg m–3. Spatial distribution of water productivity in soybean farms showed that the highest and the lowest water productivities (0.99 and 0.44 kg m–3) were in western and eastern regions of the province, respectively, in accordance to vapour pressure deficit. It was concluded that soybean production in the province could increase by 66% (from 109 970 to 182 170 tons) if 80% of the current yield gap could be removed. |
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| Keywords: | crop area oilseed production gap soybean yield gap |
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