جستجوی مقالات مرتبط با کلیدواژه "optimal cropping pattern" در نشریات گروه "اکولوژی"

The agricultural sector plays an important role in the national economy, employment and food security of various communities. During recent decades, population increasing growth and the need to food security increased pressure on natural resources especially in developing countries. Therefore, it is necessary to use the resources of production in this sector in the best way possible, while reducing the consumption of these resources, the profit and welfare of farmers also will increase. Therefore in this study, the optimal cropping pattern consistent with sustainable agriculture with cross section data of year 1394-1395 and using multi objective fractional programming approach in Ardebil county determined and compared with present cropping pattern. The required data were collected from statistical yearbook of agriculture organization. The results indicated that in order to achieve some sustainability goals such as reducing the use of chemical and water inputs, it is necessary to exclude part of gross income from total agricultural production in the short term. However, taking into account the many indirect costs that non-compliance with the principles of sustainability affects society and the agricultural environment, this reduction in the gross income of farmers can be justified.

As societies grow, human survival and well-being depend heavily on the efficient management of natural resources and the pursuit of sustainable agricultural dimensions. The aim of this study was to develop an optimal model of crop production planning in Varamin Agricultural Complex as one of the leading units in the agricultural sector of this city, with simultaneous integration of economic and environmental priorities. For this purpose, the statistical information of this agricultural unit was used during the 2015-2016 in formulating a multi-criteria mathematical programming model. In this model, it's possible to explicitly address all the priorities of future production plans. Therefore, the results showed that in optimum conditions for planning the production of crops in this unit, the goals of maximum gross margin, maximum net energy generated and minimum utilization of agricultural machinery as economic ideals and the minimum use of chemical pesticides as an environmental goal will be available simultaneously. Moreover, by combining economic and environmental priorities, wheat, barley silage, herbs and forage corn are the main combinations of optimal planning pattern.

This study aimed to determine the optimal cropping pattern and the optimal amount of water usage emphasizing on sustainability of water resources and optimizing the economic and environmental factors in Fariman-Torbatjam plain. In the first section of this research, the status of sustainability of water resource were analyzed using the sustainability indices and calculation the water balance of underground water in wet, normal and dry water years. Considering that the study aimed to propose the optimal crop pattern by emphasizing on agricultural sustainability and water resource along with maximizing gross margin, the Multi Objective Programming Models like Multi Objective Fractional Programming must be employed. The defined goals of this model are maximizing sustainable indices which involve the ratio of gross margin to water resource usage, chemical fertilizers and pesticides. By implementation of the optimal cropping pattern, the usage of water, chemical fertilizers and chemical pesticides compared to the current crop pattern will decrease by 10, 5.11 and 12.52 percent respectively and gross margin will be increased by 0.6 percent. Also, sustainability index of water, chemical fertilizers and chemical pesticides compared to current cropping pattern, will be increased by 11.78, 6.02 and 15 percent. In order to achieve to the quantitative sustainability of water resources, the ratio of water usage in agricultural sector to renewable water was used. With the implementation of the proposed optimum model, the water consumption will be reduced by 10 percent yearly, then the amount of water usage in agricultural sector in sudied area will be decreaesd by 0.7 of renewable water in 8 years, and then the quantitative and qualitative of sustainability of water resources will be achieved.