Optimizing Hill Seeding Density for High-Yielding Hybrid Rice in a Single Rice Cropping System in South China

文献类型： 外文期刊

第一作者： Wang, Danying

作者： Wang, Danying;Chen, Song;Ji, Chenglin;Xu, Chunmei;Zhang, Xiufu;Wang, Zaiman;Chauhan, Bhagirath Singh

作者机构：

期刊名称：PLOS ONE （ 影响因子：3.24； 五年影响因子：3.788 ）

ISSN： 1932-6203

年卷期： 2014 年 9 卷 10 期

页码：

收录情况： SCI

摘要： 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 x 15 cm, 25 cm x 17 cm, 25 cm x 19 cm, 25 cm x 21 cm, and 25 cm x 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 x 15 cm to 25 cm x 23 cm, productive tillers per hill increased by 34.2% and 50.0% in soil fertility 1 and 2. Panicles per m(2) declined with increases in seeding spacing in soil fertility 1. In soil fertility 2, no difference in panicles per m 2 was found at spacing ranging from 25 cm x 17 cm to 25 cm x 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 x 17 cm spacing in both soil fertility fields. Our results suggest that a seeding density of 25 cm x 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.

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