Effects of Different Nitrogen Levels on Yield and Nitrogen Utilisation of Dry-drained Japonica Rice
A field plot experiment was used to analyse the differences in dry matter and nitrogen accumulation and transport in different fertility periods of japonica rice under dry-directed wet management under different N application levels.The results showed that the application of nitrogen fertiliser significantly increased the levels of dry matter and nitrogen accumulation in stems,leaves and spikes,and the yield of japonica rice under the wet management of dry direct seeding,and the yield of the T3 treatment was the highest at 8 660.63 kg/hm2.The contribution of nitrogen accumulation and nitrogen transport to the seed grain under different nitrogen application levels tended to increase with the increase of nitrogen application,and the efficiency of nitrogen uptake and use tended to rise with the increase of nitrogen level.Correlation analyses showed that stem,leaf and spike nitrogen accumulations at the flush and maturity stages were all positively correlated with the yield of dry-directed japonica rice.The yield of dry-directed japonica rice was significantly positively correlated with the N accumulation rate of stem and leaf at the sowing-tillering-flush stage.The yield of dry-directed japonica rice was significantly and positively correlated with the N transfer rate of stems at the flush-maturity stage,and was highly significantly and positively correlated with the N transfer rate of leaves at the flush-maturity stage.Overall,the T3 treatment was able to improve the fruiting rate,increase the number of spikes,the number of grains in pikes under the dry-directed wet management,which was conducive to promoting the accumulation of nitrogen in the nutrient organs and the transfer of nitrogen to the grains,and improving the nitrogen utilisation efficiency and yield,and it was a suitable nitrogen level for the dry-directed wet management of japonica rice in the central area of Jilin Province.
RiceDry direct seedingNitrogen use efficiency rice qualityYield
万方数据
维普
