交错布种下氮肥减施对花生根系特性及产量品质的影响OA北大核心

[Objective]Since nitrogen fertilizer was applied excessively leading to low nitrogen fertilizer utilization and decreased yield and quality of peanut production in Liaoning Province,this study explored the effects of reduced nitrogen application on root morphology,yield and quality of peanut under alternative sowing on small ridge with narrow two-rows,so as to determine optimal nitrogen fertilizer reduction rate and provide theoretical reference for local peanut production.[Methods]This study was conducted in Shenyang Agricultural University from 2019 to 2020.Five nitrogen fertilizer levels were set,T0(without nitrogen fertilizer),T1(N82.5 kg·hm-2,conventional nitrogen application),T2(N70 kg·hm-2,reduced by 15%),T3(N62 kg·hm-2,reduced by 25%),T4(N54 kg·hm-2,reduced by 35%)were used to study the effects of nitrogen fertilizer reduction on root morphology,nodule characteristics,yield and quality of peanut by adopting random block design with Qinghua 6.[Results]Appropriate nitrogen fertilizer reduction had effectively promoted optimization of peanut root morphology of alternative sowing on small ridge with narrow two-rows,and T2 significantly increased root length,root surface area and average root diameter of peanut,and maintained high root vitality during the growth period.Ultramicroscopic root nodules structure of peanut showed that the reduction of nitrogen fertilizer promoted thalloids growth and liposomes production.Compared with T0,fertilizer application increased peanut pod yield by 3.76%-9.74%.However,nitrogen fertilizer reduction affected yield at different levels.The highest yield was obtained under T2 treatment,with an average increase of 2.17%compared with T1 in two years,while with the average decrease of 0.58%in T3 compared with T1.The effect of nitrogen fertilizer reduction on the quality of peanut seeds was not significant.[Conclusion]Reducing N application by 15%(T2)is suitable to root development and yield improvement,which is the befiting nitrogen fertilizer reduction mode.