Chinese Journal OF Rice Science >
Dynamic Growth Characteristics of Roots of Mechanically-transplanted Hybrid Rice Under Different Nitrogen Treatments
Received date: 2017-01-18
Revised date: 2017-04-27
Online published: 2017-11-10
【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.
Key words： mechanical-transplanting; hybrid rice; root characteristics; grain yield; nitrogen
Ke LIU, Chang YE, Shaowen LIU, Jian LU, Mengtao GAO, Bilin LU, Xiaohai TIAN, Yunbo ZHANG . Dynamic Growth Characteristics of Roots of Mechanically-transplanted Hybrid Rice Under Different Nitrogen Treatments[J]. Chinese Journal OF Rice Science, 2017 , 31(6) : 611 -618 . DOI: 10.16819/j.1001-7216.2017.7009 611
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