The Effect of Nitrogen Application Rate on Grain Filling Characteristics and Yield of Sorghum
Taking grains of Liaoza 37 and Liaonian 3 collected every 5 days after flowering as materials,the effect of different nitrogen application rates on sorghum grain filling and yield was studied under nitrogen appli-cation treatments of0,120,180,240,and 300 kg/hm2 to analyze their filling characteristics and yield forma-tion process.The results showed that when the nitrogen application rate was 180-240 kg/hm2,the yield of Li-aoza 37 reached its maximum value,which was significantly higher than that of other treatment levels;when the nitrogen application rate was 300 kg/hm2,the yield of Liaonian 3 reached its maximum value,which was significantly higher than that of other treatment levels.With the increase of N application rate,the number of days at the maximum filling rate was shortened,and the number of days during the active filling period was in-creased,which was conducive to the accumulation of dry matter and the increase of grain weight.The results showed that reasonable application of nitrogen could improve the filling rate,shorten the filling time and pro-long the active period of filling,which had a positive effect on the yield formation under the premise of ensu-ring the safe ripening of seeds.In summary,the nitrogen application rate of Liaoza 37 in eastern Hebei prov-ince should be 180-240 kg/hm2,and that of Liaonian 3 should be 300 kg/hm2.
Sorghumnitrogen applicationgrain filling characteristicsyieldeastern Hebei province
万方数据
维普
