Relations of rice seeding rates to crop and weed growth in aerobic rice

Chauhan, Bhagirath S., Singh, Virender P., Kumar, Avnish and Johnson, David E. (2011) Relations of rice seeding rates to crop and weed growth in aerobic rice. Field Crops Research, 121 1: 105-115. doi:10.1016/j.fcr.2010.11.019

Author Chauhan, Bhagirath S.
Singh, Virender P.
Kumar, Avnish
Johnson, David E.
Title Relations of rice seeding rates to crop and weed growth in aerobic rice
Journal name Field Crops Research   Check publisher's open access policy
ISSN 0378-4290
Publication date 2011-02-28
Year available 2011
Sub-type Article (original research)
DOI 10.1016/j.fcr.2010.11.019
Open Access Status
Volume 121
Issue 1
Start page 105
End page 115
Total pages 11
Place of publication Amsterdam, The Netherlands
Publisher Elsevier BV
Collection year 2012
Language eng
Subject 1102 Cardiovascular Medicine and Haematology
1111 Nutrition and Dietetics
Abstract Aerobic rice describes a management adaptation to reduced irrigation water supplies but, due to reduced intervals of flooding in this system, this requires revised weed management approaches to reduce costs and provide effective weed control. One approach is to make the crop more competitive and reduce the effects of weeds on the crop by using higher rice seeding rates. A study was conducted in the Philippines and India in 2008 and 2009 to assess the relations of seeding rates (15-125kgha-1) of hybrid and inbred varieties to crop and weed growth in aerobic rice. Plant densities, tillers, and biomass of rice increased linearly with increased in seeding rates under both weedy and weed free environments. Weed biomass decreased linearly with increasing seeding rates from 15 to 125kgha-1. Panicles and grain yields of rice in competition with weeds increased in a quadratic relation with increased seeding rates at both locations; however, the response was flat in the weed free plots. A quadratic model predicted that seeding rates of 48-80kgha-1 for the inbred varieties and 47-67kgha-1 for the hybrid varieties were needed to achieve maximum grain yield when grown in the absence of weeds, while rates of 95-125kgseedha-1 for the inbred varieties and 83-92kg seed ha-1 for the hybrid varieties were needed to achieve maximum yields in competition with weeds. On the basis of these results, seeding rates greater than 80kgha-1 are advisable where there are risks of severe weed competition. Such high seeding rates may be prohibitive when using expensive seed, and maximum yields are not the only consideration for developing recommendations for optimizing economic returns for farmers. Results of the present study do suggest however that increasing seeding rates of aerobic rice does suppress weed growth and reduce grain yield losses from weed competition. This information could be incorporated in integrated crop management packages to manage weeds more effectively.
Keyword Biomass
Cultural control
Plant density
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: Queensland Alliance for Agriculture and Food Innovation
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