缓控释肥配比对粳稻莹香1号产量及氮素吸收利用的影响OA

To investigate the effects of different combinations of slow/controlled-release nitrogen fertilizers and fast-acting nitrogen fertilizers on rice production,the japonica rice variety Yingxiang No.1 was used as the test material.5 treatments were set up:no nitrogen fertilizer application(treatment A),conventional fertilization(treatment B),100%slow/controlled-release fertilizer(treatment C),80%slow/controlled-release nitrogen fertilizer+20%fast-acting nitrogen fertilizer(treatment D),and 50%slow/controlled-release nitrogen fertilizer+50%fast-acting nitrogen fertilizer(treatment E).The tillering dynamics,agronomic traits,yield,dry matter accumulation,and nitrogen absorption and utilization efficiency of rice under each treatment were analyzed.The results showed that the number of panicles per plant and the percentage of productive tillers across treatments ranged from 2.07 to 2.97 and from 49.87%to 65.05%,respectively.Under the same nitrogen application rate,plant height and panicle length were ranked as treatment E>treatment B>treatment D>treatment C,and the configuration of the top three leaves was found to be superior in treatment E.The highest yield was obtained in treatment E,reaching 10 453.58 kg/hm2,which was 2.2%higher than that of treatment B.The highest dry matter accumulation during the jointing-heading stage and heading-maturity stage was also observed in treatment E,with values of 6 738.09 and 8 543.20 kg/hm2,respectively.Treatment E also exhibited relatively high nitrogen recovery efficiency,nitrogen agronomic efficiency,nitrogen physiological efficiency,nitrogen partial factor productivity,and nitrogen grain production efficiency,which were 41.85%,13.29 kg/kg,29.16%,38.72 kg/kg,and 50.26 kg/kg,respectively.In conclusion,the combination of 50%slow/controlled-release nitrogen fertilizer and 50%fast-acting nitrogen fertilizer was found to meet the nitrogen demand of rice throughout the entire growth period.