Document Type : Research Paper

Authors

• Ali Mansouri rad ¹
• Ali Nakhzari Moghadam ²
• Afshin Soltani ³
• Ali Rahemi Karizaki ⁴
• Benyamin Torabi ⁵

¹ PhD. Student in crop ecology, Gonbad kavous university

² Assistment professors of Crop Production Group, Gonbad Kavous University, Gonbad Kavous, Iran.

³ Department of Agronomy, Gorgan University of Agricultural Science and Natural Recourses, Gorgan, Iran.

⁴ Assistant Professors of Crop Production Group, Gonbad Kavous University, Gonbad Kavous, Iran.

⁵ Assistant Professor, Department of Agronomy, Gorgan University of Agricultural Science and Natural Recourses. Gorgan, Iran.

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. 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.

Keywords

• Actual yield
• attainable yield
• CPA
• crop management
• soybean
• Yield Gap

20.1001.1.83372008.1396.19.4.15.7