山西省晋北耕地肥力特征及其对作物产量影响OA

The quality of cultivated land is a critical factor affecting crop yield and serving as the theoretical basis for scientific fertilization.This study was conducted using data from a long-term experimental site(1997-2016)and 41-70 provincial monitoring sites(2016-2022)in typical county,northern Shanxi province,to analyze the fertility characteristics of cultivated land under long-term conventional fertilization.The random forest analysis was employed to evaluate the contribution of various factors affecting crop yield,and then scientific fertilization suggestions were proposed for the region.The results revealed that soil organic matter,total nitrogen,available phosphorus,and available potassium in 2022 showed an overall upward trend with time,increasing by 101.1%,41.2%,41.1%,and 31.9%,respectively,compared with that of the early period(1997-2016).The correlation analysis between soil fertility factors,fertilization,and yield showed that yield was closely related to nitrogen and phosphorus fertilizers.The results of the random forest model analysis showed that nitrogen fertilizer had a maximum impact of nearly 60.1%on yield,followed by phosphorus fertilizer at around 21.7%,and soil organic matter at about 13.5%,which ranked the third.Overall,after long-term fertilization,the quality of cultivated land in northern Shanxi province was effectively improved over the past 23 years,but the overall fertility was at a medium to low level.On the basis of reasonable input of nitrogen and phosphorus fertilizers,it was necessary to increase the input of organic fertilizers to improve soil organic matter.These measures could promote scientific nutrient management and sustainable agricultural production in the county.