Study On Soil Quality Field Evaluation System Of Nuisanceless Argo-Food Area Based On PDA

Agricultural products are vital material for the survival of mankind. Their safeties are highlighten because of the frequentive agricultural pollution and poisoning. Nuisanceless argo-food (NAF) came into being in China with an aim to guarantee the fundamental quality and safety of agricultural product wich are originally impacted by the producing area. For managing effectively producing area safety, gaining enough information about producing area, especially soil information is especially important. This paper proposed a soil quality evaluation descriptive index system of the NAF producing area, and carried out standardization and quantitative method. Based on this, producing area field evaluation system was established in order to provide an efficient means for producing area safety management. The system was used in Chongqing and in Tonghai county of Yunan province. Some main conclusions are obtained as follows:(1) From the aspects of soil tillage, soil fertility, crop health, soil organism, pollution source, 27 soil quality evaluation descriptive indexes were selected in this paper, including: soil texture, arable layer thickness, field water-holding capacity, soil water infiltration capacity, organic matter, saline of alkaline degree, soil pH, drainage condition, groundwater depth, crop condition, crop color and nutrient deficiency symptom, root structure, soil animal, crop residues, slope, vegetation coverage, soil erosion, drain water color, smell, soil color, soil touch sensation, soil intrusions,wind direction between potential pollution sources and producing area, and the distance from controlled source to producing area.(2) In order to improving the comparability of descriptive index and refining the difference of various soil quality, the descriptive indexes were standardized and numerical. According to the different description, it could be divided into "good", "medium", or "poor", the highest scores in which is 10 points, 10~8 points to be "good", 7~4 points to be "medium", 3~1 points to be "poor". The soil index level is judged at first and then judged score according to the differences in rating when field evaluating the soil quality.(3) According to the content and focus of on-site examination of NAF producing area, 469 fields and 28 tables were established based on the analysis of producing area character. The NAF data model was built using E-R model based on character analysis, and then built NAF producing area information database. 869 agro-production producing area records were logged in the database. It was build that soil quality field evaluation information collection System, in which the PDA is mobile terminal. The system function includes: GPS position, data operating, data process, query, multi-user landing, and data transmission. Thus the system realized local and remote inquiry, and automatic judgment of inspection results, and the information real-time transmission.(4) Based on the analysis of investigation information and PDA collecting data in TongHai country, found: most index scores increase with the increasing of soil fertility and quality, the changing trend was the same as fertility, and quality grades, the field evaluation score can reflect soil quality condition sensitively and quantitatively.(5) The soil quality field evaluation system of the NAF producing area in Tonghai county of Yunnan province is optimized to 24 index: the soil structure, soil texture, arable layer thickness, field capacity, soil water infiltration capacity, organic matter, saline of alkaline degree, pH value, drainage condition, groundwater level, crop condition, crop color and deficiency, the structure of root, the soil animals, crop residues, slope terrain parts, vegetation coverage, soil smell, soil touch sensation, soil color, soil intrusions wind direction between potential pollution sources and producing area, and the distance from controlled source to producing area.