كليدواژه :
Linear programming , Crop rotation , Optimum , Bojnord , كشاورزي , تناوب زراعي بهينه , برنامه ريزي خطي , بجنورد
چكيده لاتين :
The aim of this paper is to determine the optimum crop rotation pattern to obtain the maximum net income and to compare it with the present conditions of farm and also to sensitively and parametrically analyze the final result of using linear programming. In order to do so, the first thing done was the determination of production capacity, kinds of expenses, net income of plant productions and crop rotations, and then solving the linear programming problem with 15 constraints including land, water, labour and the opportunity of crop planting with the respective constraints of 2, 6, 3 and 4 in the form of 12 executable crop rotations. Among these, four following optimum crop rotations were determined and selected: Land l and 2 (sugar beet, wheat, corn and barley), and in Land 2 (wheat, fallow, barley and corn) and (sugar beet, wheat, fallow and corn).
Results showed that the planted areas of land 1 and 2 and the net income of the total selected crop rotations had a respective increase of 40, 3.33 and 35 percent with regard to the present condition of the land. The limitations of land I and 2, the opportunity of corn and the opportunity to plant sugarbeet were recognized as more limiting factors. Analyzing the sensitivity of the case showed that the net income earned by four optimum crop rotations and some other limiting factors were comparatively flexible, and with a final parametric analysis, the final result of the primary functions in comparison with the new functions was detemined and approved as the optimum final result.
