中国水稻科学2017，Vol.31Issue(6)：611-618,8.DOI:10.16819/j.1001-7216.2017.7009
不同氮肥处理下机插杂交稻的根系动态生长特征研究
Dynamic Growth Characteristics of Roots of Mechanically-transplanted Hybrid Rice Under Different Nitrogen Treatments
摘要
Abstract
[Objective]This experiment is to study the dynamic characteristics of roots grown under different nitrogen levels and their relationship with grain yield in mechanically-transplanted hybrid rice.[Method]Two-line hybrid rice combinations, Quanliangyou 1 and Quanliangyou 681, were grown under different nitrogen treatments, N0(0 kg/hm2), N1(150 kg/hm2) and N2(250 kg/hm2), respectively. The dynamic root morphological traits and distribution(0-30 cm) from 20 days after transplanting(DAT) to flowering were analyzed with minirhizotron technique.[Result]The total number of roots, root length, root volume and root surface area were all significantly affected by nitrogen levels. The total number of roots of the two combinations under N2 treatment was significantly higher than that under N1 treatment. Compared with N1 treatment, the total number of roots of Quanliangyou 1 and Quanliangyou 681 increased by 12.3% and 17.6%, respectively. The total number of roots of the two combinations maximized 65 days after transplanting. With the increasing amount of nitrogen, the number of roots, root length, root volume and root surface area increased in different soil layers, but the layer (10-20 cm) was much more significant compared with others. The correlation coefficients between the total root length (10-20 cm) and grain yield, the number of roots (10-20 cm) and grain yield were 0.80 and 0.87, respectively, reaching the significant level. Both the number of roots and grain yield of Quanliangyou 681 were much higher than those of Quanliangyou 1.[Conclusion]Higher nitrogen level improve the root biomass, while the root distribution in the soil layer(10-20 cm) is closely related to the grain yield. Given this situation, increasing the deep root distribution can make extraordinary contribution to the improvement of the grain yield.关键词
机插秧/根系特征/产量/氮素Key words
mechanical-transplanting/hybrid rice/root characteristics/grain yield/nitrogen分类
农业科技引用本文复制引用
刘科,叶昌,刘少文,陆键,高梦涛,卢碧林,田小海,张运波..不同氮肥处理下机插杂交稻的根系动态生长特征研究[J].中国水稻科学,2017,31(6):611-618,8.基金项目
国家重点研发计划资助项目(2016YFD0300108) （2016YFD0300108）
国家大学生创新性实验计划资助项目(20150083,2016099). （20150083,2016099）
