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Root Morphological Traits and Spatial Distribution under Different Nitrogen Treatments and Their Relationship with Grain Yield in Super Hybrid Rice.

Abstract：

:Succeeding in breeding super hybrid rice has been considered as a great progress in rice production in China. This on-farm study was conducted with Minirhizotron techniques to identify dynamic root morphological traits and distribution (0-30 cm) under different nitrogen treatments. Five elite super hybrid rice cultivars, Liangyoupeijiu (LYPJ), Yliangyou 1(YLY1), Yliangyou 2(YLY2), Yliangyou 900(YLY900) and Super 1000(S1000), were grown at four N levels: 0 kg ha-1 (N1), 210 kg ha-1 (N2), 300 kg ha-1 (N3) and 390 kg ha-1 (N4) in 2015 and 2016. Results showed these cultivars had greater root traits and higher grain yield under N3. Total root number (TRN) and total root length (TRL) of these cultivars reached maximum at 55 days after transplanting (DAT). The new released cultivars YLY900 and S1000 were featured with an improved root system among these cultivars. The percentage of root number on 10-20 cm soil was over 50% compared with other soil layer. A significant positive correlation was found between grain yield and both TRN and TRL at 10-20 cm soil layer (P < 0.01). Given this situation, the grain yield of super rice cultivars could be further improved by increasing the proportion of roots at 10-20 cm soil layer under suitable nitrogen management.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Liu K,He A,Ye C,Liu S,Lu J,Gao M,Fan Y,Lu B,Tian X,Zhang Y

doi

10.1038/s41598-017-18576-4

subject

Has Abstract

pub_date

2018-01-09 00:00:00

pages

131

issue

1

issn

2045-2322

pii

10.1038/s41598-017-18576-4

journal_volume

8

pub_type

杂志文章

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