Spatial variation of soil nutrients and evaluation of cultivated land quality based on field scale

Abstract The current cultivated land quality (CLQ) evaluation method fails to consider the determination of soil nutrients, resulting in low efficiency nutrient message extraction. In an effort effectively solve above problems, combined with spatial variation nutrients (SVSN) at field scale, a CLQ is proposed. were determined according analysis, and color was standardized. characteristic bands by fertility such as nitrogen, phosphorus, potassium, preprocessed. On this basis, extraction model constructed. According damage principle subsoiling shovel, limit value membership function exponent determined, weighted sum used calculate exponent, so realize SVSN scale. experimental results show that dimensional autocorrelation bulk density water content different layers high capillary porosity, non-capillary total porosity strong.