Evaluation Of Cultivated Land Productivity Of Zhalantun City

Abstract:According to the Evaluation of Cultivated Land principles and expert knowledge, Evaluation of Cultivated Land of ZhaLanTun City set15factors in four items below:site conditions(Slope, topographic position,≥10℃accumulated temperature, surface gravel coverage), soil management(irrigation guarantee rate, rotation system, erosion degree), profile construction(thickness of soil humus, effective thickness of soil layer,soil Body configuration), physical and chemical properties(organic matter, available phosphorus, available potassium, available zn, available mo). The weights of various evaluation indices are determined by AHP. The panels assess the membership degree of the evaluation index and cultivated land fertility and give the corresponding evaluation value.At last use the fuzzy comprehensive evaluation method to determine the cultivated land fertility.Through laboratory analysis of soil samples, water samples results, comprehensive evaluation of the Zhalantun cultivated land environmental quality.The results obtained are as follow;:(1) The average organic matter content of the city’s land soil is44.5g/kg, the organic matter content is rich; the cultivated land soil total nitrogen content is relatively high, the average is2.18g/kg; the cultivated land soil available phosphorus content is relatively high, the average is17.4mg/kg;the cultivated land soil available potassium is relatively high, the average is174mg/kg.(2) According to the Zhalantun evaluation unit of integrated fertility index of cultivated land, we divided the cultivated land fertility into nine grades reasonably.Which,the first order land is7211.7hm2,the secondary land is12964.1hm2. And the third land is22198.7hm2, The fourth land is33855.30hm2,The ffifth land is39855.10hm2.The sixth land is39058.10hm2.The seventh land is26262.80hm2.The eighth land is15546.9hm2.The nineth land is2552.3hm2.And the fertility of grade one to nine accounted for3.61%,6.50%,11.13%,16.97%,19.98%,19.58%,13.16%,7.79%,1.28%respectively.(3) According to the soil environmental quality standard,the Environmental Quality of the Part of the cultivated land in the Tiedong Office is mild polluted, the integrated pollution index is1.453, the pollution elements is cadmium, the soil cadmium content exceeding2times;Comprehensive pollution index of the Tiexi office sample is0.697, it is close to the warning limits,The other comprehensive pollution index, of the sampling points are less than0.7, Environmental quality status of the cultivated land is clean,in line with the pollution-free agricultural products, green food production producing environmental quality standards.