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Please use this identifier to cite or link to this item: http://anchan.lib.ku.ac.th/agnet/handle/001/2337

ARN: TH201000002268
Authors: Varapong Chamarerk
Yothin Konboon
Waraporn Wongboon
Boonrat Jongdee
Panya Romyen
Sommai Lertna
Authors' affiliation: Rice Department, Bangkok (Thailand). Bureau of Rice Research and Development. Ubon Rachathani Rice Research Center
Rice Department, Bangkok (Thailand). Bureau of Rice Research and Development. Ubon Rachathani Rice Research Center
Rice Department, Bangkok (Thailand). Bureau of Rice Research and Development. Ubon Rachathani Rice Research Center
Rice Department, Bangkok (Thailand). Bureau of Rice Research and Development. Ubon Rachathani Rice Research Center
Rice Department, Bangkok (Thailand). Bureau of Rice Research and Development. Nakornratchasima Rice Research Center
Rice Department, Bangkok (Thailand). Bureau of Rice Research and Development. Nakornratchasima Rice Research Center
Title: Consortium for unfavorable rice environment (CURE) working group 1: Drought-prone rainfed lowlands Ubon Ratchathani and Nakorn Ratchasima, Thailand
Corporate authors (Thai): Rice Department, Bangkok (Thailand). Bureau of Rice Research and Development
Citation: [Proceedings of rice and temperate cereal crops annual conference 2008 volume 2/2], Bangkok (Thailand), p. 458-459
Format Extent: 228 p.
Issue Date: 2008
Language: En
Keywords: Rainfed lowland rice
Management
Drought tolerance
Varieties
Fertilizers
Ubon Ratchathani province
Nakhon Ratchasima province
Subject Classification(ASC): F01
F30
F04
AGROVOC: Oryza sativa
Rainfed farming
Production
Management
Varieties
Plant breeding
Weeds
Fertilizers
Nitrogen
Drought
Drought resistance
Yields
Thailand
Abstract: Two years of on-farm tests showed that KDML105-backcross derivatives yielded 1.7 t/ha when severe drought occurs at flowering and grain-filling. The first short-duration KDML backcross derivative was tolerant to blast and matures approximately one to two weeks earlier than KDML105, which reduces its exposure to late-season drought frequently occurring in Northeastern Thailand. It was used and tested in several of the CURE trials and officially released as RD33 on March 6, 2007. For crop management practices, improved establishment and weed control methods were evaluated in a minimum of eight farmers' fields per key site with participation of farmers and agricultural development workers. Participatory experiments were conducted on five upper and five lower fields in Phimai District to evaluate the effectiveness of pre-emergence and post-emergence herbicides treatments in direct-seeded crops relative to water level fluctuations on weed pressure. The second activity evaluated farmers' usual weed management to plots that were clean weeded by hand. The third activity tested a rice-mungbean intercrop system with six farmers, as farmers had indicated an interest in this practice. Weed pressure reduced yields by an average 0.6 t/ha in direct-sown fields relative to cleanly weed crops. Complete weed control resulted in a 25-30 percent yield increase in direct-seeded crops. For nutrient management, improved nutrient management methods that take into account water status and pest risk were evaluated in a minimum of eight fields per key site with participation of farmers and extension workers. The observed farmers' practice of using fertilizers, which may be as much as 85 percent below the current recommended rates, was highly field-specific and cost-efficient, and maintained system productivity. Participatory experiments evaluating fertilizer treatments were conducted on 10 farms at the Roi Et site. The results showed that farmers' low fertilizer rates are as productive but often more profitable than recommended doses for traditional-type varieties like RD6, RD15, and KDML105, which can yield up to 4.0 t/ ha only under favorable conditions of standing water (usually occurring in lower fields) and in soils with a clay content greater than 5 percent. On-farm trials verified the effectiveness of farmers' practice of applying low N rates on N-use efficiency in tests on eight fields each in upper and lower terraces in Roi Et Province. In general, the tests showed that small rates of fertilizer (20-8.7-8.3 NPK/ha) could get as good results as medium rates (40-8.7-8.3 NPK/ha). But the amount of improvement on crop growth and yield depended on the field position in the toposequence. On upper terraces, the tests showed that fertilizer could significantly improve crop growth and grain yield, but the amount of improvement diminished quickly as higher rates were applied. A doubled rate of N brought about only a slight improvement of crop growth and yield. On lower terraces, even low fertilizer rates (20-8.7-8.3 NPK/ha) could only slightly improve crop growth and yield, and a doubled N rate (40-8.7-8.3 NPK/ha) did not increase yields significantly.
Format Extent: 228 หน้า
Availability : Rice Department, 50 Phahon Yothin Road, Chatuchak, Bangkok 10900, Thailand
Availability: กรมการข้าว
Appears in Collections:Rice Department

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