نتایج جستجو برای: agricultural water
تعداد نتایج: 635409 فیلتر نتایج به سال:
Non-harmonious and unsustainable agricultural practices have major impact on the environment, causing animal and human diseases. Agriculture is an essential part of our lives. However, excessive use of agrochemicals, and irresponsible and harmful agricultural habits cause soil and water pollution, and secondary contamination of human food chain. Contamination of soil and water with toxic agroch...
We hypothesise that climate change, together with intensive agricultural systems, will increase the transfer of pollutants from land to water and impact on stream health. This study builds, for the first time, an integrated assessment of nutrient transfers, bringing together a) high-frequency data from the outlets of two surface water-dominated, headwater (~10km(2)) agricultural catchments, b) ...
This paper studies the effects of rural infrastructure development on agricultural production technical efficiency, using data from the second agricultural census of China. Employing Data Envelopment Analysis, this paper first estimates agricultural production technical efficiency of each administrative area of China. A Tobit model is then applied to study the effects on agricultural production...
Prior Converted Croplands (PCCs) are historic wetlands that were transformed (drained, dredged, filled or leveled) to support production of agricultural crops prior to “Swampbuster” provisions of the 1985 Food Security Act. Our research suggests that PCCs can substantially reduce nitrate export from agricultural watersheds in the region, an ecosystem function shared with natural and restored we...
The main purpose of this study was to explore the factors affecting optimal management of agricultural water in Hamadan's area. The statistical population of the study included all Hamadan's farmers. A number of 148 farmers were selected randomly through a proportional sampling method in two phases. Both questionnaire and interview techniques were used in order to collect data. The empirical an...
Rainfed agriculture is practised on 80% of the world’s agricultural area and generates 60–70% of the world’s staple food1 (FAOSTAT, 2005). In semi-arid and dry subhumid zones, rainfed agriculture dominates food production systems, and water is a key limiting factor to crop growth (SEI, 2005). Since approximately 70% of the world’s poor are women, the importance of rainfed sources of food weighs...
One of the major factors contributing to surface water contamination in agricultural areas is the use of pesticides. The Soil and Water Assessment Tool (SWAT) is a hydrologic model capable of simulating the fate and transport of pesticides in an agricultural watershed. The SWAT model was used in this study to estimate stream flow and atrazine (2-chloro-4-(ethylamino)-6-(isopropylamino)-s-triazi...
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