Abstract:According to the evaluation result of cultivated land quality grade of Jingyuan County,this study aim to evaluate the cultivated land quality grade of Jingyuan County and discuss the countermeasures of cultivated land fertility protection and quality improvement.According to the "Cultivated Land Quality Grade" and the cultivated land quality grade evaluation index system of the Loess Plateau,the county-level cultivated land resource management information system was used to establish the cultivated land quality grade information system database,and the quality grade of cultivated land in Jingyuan County was evaluated by means of spatial analysis,analytic hierarchy analysis,fuzzy mathematics,and comprehensive index.The cultivated land in Jingyuan County was affected by the geomorphology,topography and hydrogeological conditions and had obvious regional distribution rule.From north to south,tenth-grade land to third-grade land in turn,the areas accounted for 1.51%,23.51%,41.55%,15.92%,10.31%,3.87%,2.34%,and 0.99%,respectively..The average grade of cultivated land quality was 7.64,and the main utilization types of cultivated land were gradually changed from dry land and sand field to vegetable land and paddy field.The average content of organic matter,available phosphorus,and available potassium in the county was 11.41 g/kg,16.55 mg/kg,178.03 mg/kg,all of which were of medium level.Total nitrogen was 0.70 g/kg,which was a low level.The evaluation relatively accurately reflected the current status of cultivated land quality grade in Jingyuan County.Based on the cultivated land quality issues,a reasonable analysis can provide a reference for the monitoring and protection of cultivated land quality.