Optimizing hill seeding density for high-yielding hybrid rice in a single rice cropping system in South China

Wang, Danying, Chen, Song, Wang, Zaiman, Ji, Chenglin, Xu, Chunmei, Zhang, Xiufu and Chauhan, Bhagirath Singh (2014) Optimizing hill seeding density for high-yielding hybrid rice in a single rice cropping system in South China. PLoS One, 9 10: . doi:10.1371/journal.pone.0109417


Author Wang, Danying
Chen, Song
Wang, Zaiman
Ji, Chenglin
Xu, Chunmei
Zhang, Xiufu
Chauhan, Bhagirath Singh
Title Optimizing hill seeding density for high-yielding hybrid rice in a single rice cropping system in South China
Journal name PLoS One   Check publisher's open access policy
ISSN 1932-6203
Publication date 2014-10-01
Year available 2014
Sub-type Article (original research)
DOI 10.1371/journal.pone.0109417
Open Access Status DOI
Volume 9
Issue 10
Total pages 14
Place of publication San Francisco, CA, United States
Publisher Public Library of Science
Language eng
Formatted abstract
Mechanical hill direct seeding of hybrid rice could be the way to solve the problems of high seeding rates and uneven plant establishment now faced in direct seeded rice; however, it is not clear what the optimum hill seeding density should be for high-yielding hybrid rice in the single-season rice production system. Experiments were conducted in 2010 and 2011 to determine the effects of hill seeding density (25 cm×15 cm, 25 cm×17 cm, 25 cm×19 cm, 25 cm×21 cm, and 25 cm×23 cm; three to five seeds per hill) on plant growth and grain yield of a hybrid variety, Nei2you6, in two fields with different fertility (soil fertility 1 and 2). In addition, in 2012 and 2013, comparisons among mechanical hill seeding, broadcasting, and transplanting were conducted with three hybrid varieties to evaluate the optimum seeding density. With increases in seeding spacing from 25 cm×15 cm to 25 cm×23 cm, productive tillers per hill increased by 34.2% and 50.0% in soil fertility 1 and 2. Panicles per m2 declined with increases in seeding spacing in soil fertility 1. In soil fertility 2, no difference in panicles per m2 was found at spacing ranging from 25 cm×17 cm to 25 cm×23 cm, while decreases in the area of the top three leaves and aboveground dry weight per shoot at flowering were observed. Grain yield was the maximum at 25 cm×17 cm spacing in both soil fertility fields. Our results suggest that a seeding density of 25 cm×17 cm was suitable for high-yielding hybrid rice. These results were verified through on-farm demonstration experiments, in which mechanical hill-seeded rice at this density had equal or higher grain yield than transplanted rice.
Keyword Hybrid rice
Cropping system
South China
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Article ID: e109417

Document type: Journal Article
Sub-type: Article (original research)
Collections: Queensland Alliance for Agriculture and Food Innovation
Official 2015 Collection
 
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Created: Tue, 28 Oct 2014, 05:13:05 EST by Bhagirath Chauhan on behalf of Centre for Plant Science