Feasibility Of Developing Green Food In Central Arid Agricultural Areas, Gansu Province

The presently research of this paper focus on sustainable agriculture is universal. This aim of the paper is constructive argument with the feasibility of developing green food in central Gansu province. The method of this research is a comparison between arid agriculture and irrigated agriculture in the most ecological and environmental character, such as environmental quality (adopts national standards of environmental quality assessment), agricultural input levels of agrochemicals and diversity of crops. In additiona, it also explored that the effect of organic farming on the developing economy of the region, improvability of ecological environment and resident's livelihood in central Gansu Province. From this study we have drawn the following conclusion:1. Our study is to evaluate the environmental quality of the air, water and agricultural soil in the central Gansu, taken account the environmental quality standard issued by NEPA (National Environmental Production Agency). The results indecated that there was no significant difference in the enrichment levels of the heavy metals and arsenic in the agricultural soils, compared to that of the natural soils. It is possibly due to a lower input of agrochemicals and slight industrial pollution in this area. The enrichment factors and the Pearson correlation of the heavy metals and arsenic come from natural source such as crops soils in the arid agricultural area.Levels of sulfur dioxide, nitrogen dioxide and fluorides measured in this study are generally lower than the guideline values of air environmental quality classification (â…¡)issued by NEPA. These results suggested that there is a slight pollution of anthropogenic sources in this region.Surface water samples from arid agricultural area in central Gansu Province showed that Cd and Pb concentrations in most of their samples were lower than those of detection limit, while Hg, Cr⁶⁺, As, Cl^-, CN^- and F^- concentrations in water from this area were lower than their guideline values for naturally occurring chemicals that are health significance in drinking-water suggested by WHO. Base on the whole dataset these elements and ions are inferred to derive from natural sources.Our study suggested that the environmental quality of the arid agricultural area might be suitable for developing green food industry.2. The levels of Cd, Hg, Pb, Cr⁶⁺ and As in five different foods (edible vegetables and foodstuff), Hot pepper (Capsicum annuum L.), Eggplant (Solarium melongena L.) and...