控释氮肥减量对玉米养分吸收、氮肥利用率及产量的影响OA

On the basis of long-term nitrogen fertilizer monitoring experimental sites,this study used the maize variety'Zhengdan 958'as the material and designed six treatments:no nitrogen fertilizer(T1),urea at a conventional rate(T2),controlled-release nitrogen fertilizer at a conventional rate(T3),controlled-release nitrogen fertilizer reduced by 10%(T4),controlled-release nitrogen fertilizer reduced by 20%(T5),and controlled-release nitrogen fertilizer reduced by 30%(T6).The study aimed to investigate the effect of long-term reduced nitrogen application on maize yield,nutrient accumulation,and soil chemical properties.The results showed that reducing controlled-release nitrogen fertilizer by 10%-20%maintained high maize yields while significantly improving nitrogen use efficiency.Compared with the T1,T4 and T5 increased nitrogen partial productivity to 35.15 and 38.15 kg/kg,respectively,with nitrogen use efficiencies reaching 56.00%and 64.10%,yield increases of 137.60%and 142.00%,and no significant difference in yield compared with T3.Among the treatments,the T4 was more favorable for nitrogen and phosphorus accumulation in the plants,with the aboveground nitrogen and phosphorus accumulation reaching 3.43 and 0.62 g/plant,respectively.This treatment,while maintaining soil total nitrogen and alkali-hydrolyzable nitrogen significantly higher than the T1,effectively mitigated soil acidification.Therefore,it was recommended that conventional urea could be replaced with controlled-release urea and nitrogen application could be reduced by 10%-20%on this basis to achieve high maize yields,efficient nitrogen utilization,and sustainable agricultural production.