摘要
为了确定冀东地区不同施氮水平对高粱籽粒灌浆及产量的影响,2023年以辽杂37号和辽粘3号高粱品种为材料,在0,120,180,240,300 kg/hm2等5个施氮水平下,进行了大田种植试验,于花后每隔5 d采集籽粒分析其灌浆特性及产量形成过程.结果表明,当施氮量为180～240 kg/hm2时,辽杂37号的产量达到最大值,显著高于其它各施氮水平处理;施氮量为300 kg/hm2时,辽粘3号的产量达到最大值,显著高于其它各施氮水平处理.随着施氮量的增加,到达灌浆速率最大时的时间缩短,灌浆活跃期持续时间增加,有利于高粱籽粒干物质的积累和粒质量的增加.说明,在保证籽粒安全成熟的前提下,合理施氮可以提高高粱品种的灌浆速率,缩短灌浆时间,延长灌浆活跃期,对产量形成有积极作用.冀东地区高粱品种辽杂37号的施氮量应为180～240 kg/hm2,辽粘3号的施氮量应为300 kg/hm2.
Abstract
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.
基金项目
河北省现代农业产业技术体系建设专项资金项目(HBCT2024070405)
维普
万方数据