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Evaluation of Farmland Productivity in Shehong County

Author: ZhengJiaWei
Tutor: WuJun
School: Sichuan Agricultural University
Course: Utilization of Agricultural Resources
Keywords: SheHong county cultivated land fertility evalution
CLC: S158
Type: Master's thesis
Year: 2013
Downloads: 37
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Abstract


In this paper, the SheHongXian county in sichuan province as the research area, with the support of GIS and computer technology, according to Soil testing formula fertilization technical specifications (trial) of The ministry of agriculture and nation agricultural technology extension service center,"the cultivated land feitility evaluation guide", with the soil map, administrative zoning map and land utilization present situation chart of superposition intersection division of the cultivated land fertility evaluation unit; In arable layer thickness, oil parent material, land terrain and site conditions factor such as three; PH, land quality, Organic matter three physical and chemical properties and site layer factors such as three; Effective phosphorus, rapidly-available potassium, total nitrogen three soil nutrient factors; Irrigation capacity and cropping system into two soil management factor as evalution index system, to establish SheHong county cultivated land fertility evalution index system; Using analytic herarchy process (AHP) and a Delphi method to determine the weight and membership; Finally in the county of cultivated land resource management information system use accumulate method to calculate the cultivated land fertility composite index, acoording to cumulative frequency curve method, determining the cultivated land fertility level and maping the cultivated land fertility level distribution. According to the evaluation results of the study area of cultivated land use in the analysis of existing problems, puts forward suggestions for the sustainable utilization of cultivated land resource. The main result of this research are as follows:(1) Have screening arable layer thicknes, soil parent material, land terrain, irrigation capacity, cropping system, effective phosphorus, rapidly-available potassium, total nitrogen, PH, land quality and organic matter11cultivated land fertility evaluation factors, determine the corresponding weight and membership degree; Farmland productivity index was calculated; using the cumulative SheHong county farmland productivity curve method is divided into five levels, the county accounted for0.37%of the total area of arable land and6.57%,14.44%,36.09%,14.44%. Meanwhile, mapping out the cultivated land fertility level distribution.(2) Using the second soil census classification index, various the villages and towns in the average of the soil nutrient content has carried on the classification, the result shows that SheHong county farmland soil organic matter content is in10~20g/kg this range, belonging to organic medium area; Most of the total nitrogen content is between0.75~1.5g/kg, belonging to total nitrogen medium area; Most effective phosphorus content be between6to20mg/kg, belonging to the effective phosphorus medium area; Rapidly-available potassium is generally between50to130mg/kg, beloning to the rapidly-available potassium medium area.(3) Puting forward the following suggestion for soil nutrient condition of SheHong county:to strengthen the construction of farmland soil fertility and the using of soil improvement, such as increasing application of organic fertilizer, strengthening the improved utilization of soil of low yield, for the cultivated land on steep slope, we should pay attention to maintain water and soil and moisture and fertility, for the low slope cultivated land, we should step by step change ladder soil instead of slope soil; Scientific fertilization, according to the fertilizer law of crops, fertilizer of soil and effect of fertilizer, to ensure the optimal fertilization time and fertilization amount and improve applying the content and fertilizer efficiency of the organic fertilizer; to Strengthen quality management of cultivated land.

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CLC: > Agricultural Sciences > Agriculture as the foundation of science > Soil > Soil fertility (soil fertility )
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