连续施用生物有机肥对连作棉花生长、养分吸收及产量的影响OA

In order to investigate the effects of bio-organic fertilizer application on cotton growth,control of Verticillium wilt,biomass accumulation,nutrient uptake,and yield formation in a multi-year continuous cotton field,in this study,we investigated the plant height and stem thickness,leaf photosynthetic pigment content and defensive enzyme activity,nutrient uptake in various organs,and yield formation of cotton through 2 consecutive years of fertilizer application experiments[farmer-applied fertilizer(CK)and farmer-applied fertilizer plus bio-organic fertilizer(BOF)]in cotton fields that had been continuously cropped for 23 years.The results showed that in the 2-year fertilization experiment,compared with the CK treatment,the BOF treatment significantly increased plant height,stem thickness of cotton at the full bud stage and flowering and boll stage,as well as the photosynthetic pigment content and defensive enzyme activity in leaves at the flowering and boll stage.At the flowering and boll stage,the malondialdehyde(MDA)content in leaves decreased by 24.32％-30.27％,the incidence rate of cotton Verticillium wilt was reduced by 14.84-20.66 percent points,and the relative control effect on Verticillium wilt reached 61.80％.At the same time,it promoted the accumulation of dry matter mass of the cotton plant.The dry matter mass at the boll stage and fluffing stage increased by 47.15％-70.37％and 56.66％-61.97％,respectively;the seed cotton yield was enhanced by 28.17％(seed cotton yield of 8 476.67 kg·him-2 in 2023)and 19.82％(seed cotton yield of 8 515.46 kg·hm 2 in 2024),respectively.The application of bio-organic fertilizer could promote the uptake of N,P,K nutrients by cotton plants,and the N,P,K bias productivity of BOF treatment increased by 19.20％-28.16％,19.83％-28.17％,and 19.82％-25.90％,and the N,P,K bias factor nutrient balance increased by 67.69％-73.13％,50.00％-88.89％,71.51％-76.89％,respectively.The study showes that the application of bio-organic fertilizers in cotton fields with long-term continuous cropping is beneficial to the growth of cotton plants and the formation of biomass,can promote crop nutrient absorption,and significantly increase cotton yield.