Shahram SekhavatiFar; ali Rahemi karizaki; Ali Nakhzari Moghaddam; Mehdi Mollashahi
Abstract
Understanding the performance potential and the gap between the actual yields of crops with the achievable function is necessary to diagnose the limiting factors of performance. The present study was conducted based on the method of CPA in 50 fields of Zavkooh villi (Kalaleh, Golestan, Iran) in 2016 ...
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Understanding the performance potential and the gap between the actual yields of crops with the achievable function is necessary to diagnose the limiting factors of performance. The present study was conducted based on the method of CPA in 50 fields of Zavkooh villi (Kalaleh, Golestan, Iran) in 2016 and 2017. In this study all information related to management practices, soil characteristics and farmer socio- economic status were measured and recorded. In the comparative performance analysis (CPA) method, using stepwise regression, the relationship between variables and yield was considered. And yield gap rate, its causes factors and it was also estimated the contribution of each of these factors to the creation of a yield gap. The results showed that between the average real yield (2308 kg ha-1) and the yieldable yield (4123 kg ha-1), there is 1818 kg per hectare of vacuum. Accordingly, the most important factors in yield gap for the region included: field size with 21.4 percent, Summer plowing with 15 percent, The time of land preparation and plowing with 14.7 percent, nitrogen fertilizer with 14.6 percent, potassium fertilizer with 14 percent, weeds density per unit area with 10.8 percent), seed treatment with 8.1 percent and Subsoiler with 1.4 percent.
Ali Mansouri rad; Ali Nakhzari Moghadam; Afshin Soltani; Ali Rahemi Karizaki; Benyamin Torabi
Abstract
One of the main problems of soybean production in the east region of Golestan, Iran is considerable difference between actual yield and attainable yield which is called yield gap. In recent years, this gap has been impressive, and therefore, identifying soybean yield-limiting factors is essentially needed. ...
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One of the main problems of soybean production in the east region of Golestan, Iran is considerable difference between actual yield and attainable yield which is called yield gap. In recent years, this gap has been impressive, and therefore, identifying soybean yield-limiting factors is essentially needed. The present study was conducted based on CPA method in 73 fields of Kalaleh )Golestan, Iran) in 2016. In this study all information related about management practices, soil characteristics and farmer socio-economic status were measured and recorded. Then, using stepwise regression, the relationship between variables and yield was considered. The results showed that there is a 2606.4 kg/ha difference (gap) between actual yield (average farmers' yield) and attainable yield (maximum farmers' yield). It was identified that farming experience, burying plant residues in the soil, planting date, Sprinkler irrigation, the amount of used water and plant density were contributed to yield gap, 30.1, 5.1, 14.7, 13.8, 13.8 and 22.5%, respectively. It could be concluded that improving these factors will increase the yield up to 1802.9 kg/ha.