USING BOUNDARY LINE ANALYSIS IN YIELD GAP STUDIES: CASE STUDY OF WHEAT IN GORGAN

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HAJJARPOUR A.; SOLTANI A.; TORABI B.

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Journal: Crop Production Year:2016 | Volume:8 | Issue:4 Page(s): 183-201

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Title

USING BOUNDARY LINE ANALYSIS IN YIELD GAP STUDIES: CASE STUDY OF WHEAT IN GORGAN

Author(s)

HAJJARPOUR A. | SOLTANI A. | TORABI B. | Issue Writer Certificate

Keywords

FOOD SECURITYQ1

ENVIRONMENTAL FACTORSQ3

MANAGEMENT FACTORSQ1

PROPER STATISTICAL METHODSQ2

POTENTIAL YIELDQ1

REASONS OF YIELD GAPQ1

Abstract

Background and objectives: Due to increase in the world population and increasing concerns about the future FOOD SECURITY, shrinking the yield gap has become a hot area of research in field crops. Estimation the amount of yield gap and determination of its causes requires using proper methods. Boundary line analysis is a statistical method that can quantify the response of yield to an environmental or management factor in a situation in which other determining factors are not constant. Indeed, with this method it is possible to determine the response of yield to a factor assuming other factors are optimal. The first objective of this study was to introduce a method of boundary line analysis as a practical analysis in yield gap studies of crops. Another one was how to use of this method to determine the best managements and estimate the POTENTIAL YIELD and yield gap of wheat in Gorgan region which is an important wheat producing region. Materials and methods: Yield potential, yield gap reason and factor importance in yield gap could be determined by sampling of farmer fields and this analysis method. Data were collected from 95 wheat farms during 2008 and 2009 in Gorgan. In this research soil and plant conditions were not considered and management practices were evaluated. MANAGEMENT FACTORS included the amount of nitrogen fertilizer (N) (total and top dress), phosphorus (P2O5), potassium (K2O), and frequency of irrigation, plant density and planting date.Results: With plotting of yield data against MANAGEMENT FACTORS, the highest yield for each level of input or MANAGEMENT FACTORS were determined. The results show that while the average yield of farmers is 4700 Kg ha-1, they can achieve up to 6200 Kg ha-1 by improving their cultural management. For this purpose, the following should be considered: (1) using at least 96 Kg ha-1 of N fertilizer so that 73 Kg ha-1 of it should be used as top dressing after sowing, (2) using at least 31 Kg ha-1 of P2O5 and 40 Kg ha-1 of K2O as a base fertilizer, (3) at least two irrigations, (4) plant density of 182 to 447 in m2, and (5) planting date before the late of November. Conclusion: Boundary line analysis in yield gap studies can be used to evaluate response of yield to different MANAGEMENT FACTORS and to estimate yield potential and yield gap. Interpretation of the result is simple and obvious. This analysis reduces the common field trail and showing the clues for new field trail. If this kind of field studies were done during several years for important crops, ability of this analysis could be used for finding different ways for increasing yield. It is strongly recommended that the boundary line analysis to be used as one of a method in yield gap studies of crops.

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APA: Copy

HAJJARPOUR, A., SOLTANI, A., & TORABI, B.. (2016). USING BOUNDARY LINE ANALYSIS IN YIELD GAP STUDIES: CASE STUDY OF WHEAT IN GORGAN. ELECTRONIC JOURNAL OF CROP PRODUCTION, 8(4), 183-201. SID. https://sid.ir/paper/135212/en

Vancouver: Copy

HAJJARPOUR A., SOLTANI A., TORABI B.. USING BOUNDARY LINE ANALYSIS IN YIELD GAP STUDIES: CASE STUDY OF WHEAT IN GORGAN. ELECTRONIC JOURNAL OF CROP PRODUCTION[Internet]. 2016;8(4):183-201. Available from: https://sid.ir/paper/135212/en

IEEE: Copy

A. HAJJARPOUR, A. SOLTANI, and B. TORABI, “USING BOUNDARY LINE ANALYSIS IN YIELD GAP STUDIES: CASE STUDY OF WHEAT IN GORGAN,” ELECTRONIC JOURNAL OF CROP PRODUCTION, vol. 8, no. 4, pp. 183–201, 2016, [Online]. Available: https://sid.ir/paper/135212/en

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