Implications of plant geometry and weed control options in designing a low-seeding seed-drill for dry-seeded rice systems

Chauhan, B. S. and Opena, J. (2013) Implications of plant geometry and weed control options in designing a low-seeding seed-drill for dry-seeded rice systems. Field Crops Research, 144 225-231. doi:10.1016/j.fcr.2012.12.014


Author Chauhan, B. S.
Opena, J.
Title Implications of plant geometry and weed control options in designing a low-seeding seed-drill for dry-seeded rice systems
Journal name Field Crops Research   Check publisher's open access policy
ISSN 0378-4290
1872-6852
Publication date 2013
Year available 2013
Sub-type Article (original research)
DOI 10.1016/j.fcr.2012.12.014
Open Access Status
Volume 144
Start page 225
End page 231
Total pages 7
Place of publication Amsterdam, The Netherlands
Publisher Elsevier BV
Language eng
Subject 1102 Cardiovascular Medicine and Haematology
1111 Nutrition and Dietetics
Abstract Farmers in many Asian countries are moving from puddled-transplanted rice to dry-seeded rice systems as they respond to increased costs or decreased availability of labor or water. Hybrid rice has the potential to grow in dry-seeded conditions and can perform well even if seeds can be planted at low seedling rates. A field study was conducted in the wet season of 2011 and dry season of 2012 to evaluate the effect of plant-to-plant spacing (10 or 20. cm), the number of rice seeds planted per spacing (2 or 3), and weed control methods (42 days weedy, weed-free, and oxadiazon followed by penoxsulam. +. cyhalofop) on the growth and yield of rice under a dry-seeded rice system. The crop was planted at 20-cm row spacing. Herbicide-treated plots had fewer rice plants than the 42 days weedy and weed-free plots when rain occurred before crop emergence. However, the herbicide treatment provided 81-93% better weed control than the 42 days weedy treatment, which resulted in 54-125% yield advantages over no weeding for 42 days. Grain yield in the herbicide-treated plots was only 75-88% of the grain yield in the weed-free plots, suggesting further scope to improve rice yield in dry-seeded systems. Grain yield was similar across plant-to-plant spacing and the number of seeds planted per spacing. Our study suggests that hybrids can be grown at low seeding rates or at 20-cm plant-to-plant spacing, provided that there is no herbicide phytotoxicity on crop emergence and rice plant density is uniform. These results may help manufacturers in designing sowing drills with precise seed-metering systems for dry-seeded rice systems in Asia.
Keyword Asia
Dry seeding
Herbicide
Hybrid
Weed control
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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