Alireza Nehbandani; Mojtaba Saadati; Mahdi Goodarzi; Afshin Soltani
Abstract
Food security reduction due to climate change is one of the most important challenges in the 21st century. This study was carried out to predict the potential yield and production of the country’s strategic crops examining various climate change scenarios. In this study, the potential yield & ...
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Food security reduction due to climate change is one of the most important challenges in the 21st century. This study was carried out to predict the potential yield and production of the country’s strategic crops examining various climate change scenarios. In this study, the potential yield & production of 17 crops (Wheat, barley, rice, common bean, rapeseed, chickpea, grain maize, cotton, lentil, potato, sesame, soybean, sugar beet, sugarcane, sunflower, alfalfa and Silage maize) were estimated under current conditions (period 2005-2014) & two climatic scenarios (optimistic:1.5 ° C increase in temperature with 14% increase in precipitation period 2005-2014; pessimistic: 1.5 ° C increase in temperature & 14% decrease in precipitation period 2005-2014) applying SSM-iCrop2 model. The results showed that the pessimistic scenario reduced the potential production of wheat & legumes (about 1%) & the optimistic scenario increased the potential production of these crops (4 & 2%, respectively). Both climate change scenarios reduced the potential production of rice, potato, oilseeds & sugar crops (4, 10, 5 & 7%, respectively). Furthermore, the potential production of Silage maize increased in both climate change scenarios (2% & 3%, respectively). The results showed that the major factors which alter crop yield could be the growing season duration, radiation use efficiency and transpiration efficiency. In general, wheat, barley, potato, and sugarcane were more affected by climate change than other crops.
Hamid Ahmadi Alipour; afshin soltani; hossein kazemi; Alireza Nehbandani
Abstract
Wheat (Triticum aestivum L.) as one of the most important agronomic crops has a special status in Iran. Reducing the yield gap is one of the ways to raise the production. In order to, the production rate and the wheat yield gap in Golestan province were analyzed by using a simple simulation model SSM– ...
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Wheat (Triticum aestivum L.) as one of the most important agronomic crops has a special status in Iran. Reducing the yield gap is one of the ways to raise the production. In order to, the production rate and the wheat yield gap in Golestan province were analyzed by using a simple simulation model SSM– Wheat and GIS software. For this purpose, the managerial information of wheat farming and cultivation were collected based on the provincial level and with regards to the information of 25 weather station and the region soil information, the potential yield was simulated in the irrigated and rainfed conditions at the provincial level and then the potential yield zoning was performed in the GIS and then with regards to the farmer's production rate and real yield at the provincial level, the yield gap and the production one were also calculated in the irrigated and rainfed conditions. Results indicated that the yield average of irrigated and rainfed potential with regards to the figures and current agricultural methods are respectively 8.140 and 4.930 kg per hectare. Also, the potential production in the irrigated and rainfed conditions was obtained equal to 1.357 and 1.112 million tons (total 2.469 million tons). Results showed that in case of studying and removing the factors which may cause the yield gap in the said province, the wheat production can be increased from the current 926 thousand tons to 1.975 million tons. Based on the results of Golestan province, the most important factors causing wheat yield vacuum with current cultivars and agronomic management, improper irrigation management, improper cultivation of cultivars and inappropriate use of basic fertilizers, road and low fertilizer, and for eliminating yield vacuum, use of 165 to 215 kg of seed per hectare, using certified seeds of suitable cultivars for water and dry farming, consuming at least 50 kg of phosphorus fertilizer (equivalent to P2O5) during cultivation, consuming at least 95 kg of pure nitrogen per hectare and integrating farms are suggested.