Effects of replacing partial chemical fertilizers with green manure straw on the yield and quality of pepper

LIU Xiaoyang; CHEN Jianfeng; FU Libo; WANG Zhiyuan; CHEN Hua; WANG Wei; YANG Yanxian; ZHANG Qing; YANG Jida; YIN Mei

doi:10.16861/j.cnki.zggc.2024.0797

Abstract：This study focuses on the issue of decreased crop quality caused by excessive application of chemical fertiliz-ers in the chili pepper industry in Yunnan,and is committed to exploring a scientific and reasonable combined application scheme of chemical fertilizers to enhance the yield and quality of chili pepper.Taking the commonly used Erjingtiao chili pepper in the Yunnan market as the test object,different proportions of green manure straw treatment with chemical fertil-izer application and a control treatment(CK)with 100％chemical fertilizer were set up to ensure a constant total amount of nitrogen,phosphorus and potassium nutrients in each treatment plot.During the maturity and critical growth stages of chili pepper,key indicators such as yield,chlorophyll content,fruit morphology,nutrient components,and nitrate content were measured.The results showed that compared with the control treatment(CK),combining chemical fertilizer with 30％green manure straws significantly increased pepper yield by 22.29％,significantly increased chlorophyll content dur-ing the fruiting period by 7.47％,and improved pepper fruit morphology to better meet market demands.In terms of fruit quality,the content of nutrients such as nitrogen,phosphorus,protein and vitamin C significantly increased by 5.63％,9.48％,9.96％and 25.96％,respectively,while the harmful substance nitrate significantly decreased by 20.5％.The com-bined application of chemical fertilizers and green manure straws can not only significantly increase the yield of chili pep-per,but also improve fruit morphology,enhance nutrient composition and reduce the content of harmful substances.Among them,70％chemical fertilizers+30％green manure(SF3 treatment)has the best effects,providing a scientific ba-sis for the reduction of chemical fertilizer application in chili pepper cultivation in Yunnan and helping to promote the sus-tainable development of the chili pepper industry.