Title: Estimation of Herbicide Application Timing Based on Emergence Pattern and Early Growth of Paddy Weeds
Abstract: This studies were conducted to estimate application timing of herbicides for controlling paddy weeds based on the emergence time and early growth of annual and perennial weeds in rice paddy fields. Weed emerged earlier in 2001 compared to average year because the accumulative mean air temperature and the maximum air temperature were higher in 2001 than in 2000 and average year. Leaf number of Echinochloa crus-galli was 1.7, 2.5 at 10 and 15 days after harrowing, respectively, which was faster in emergence and growth compared to the usual year. Echinochloa crus-galli emerged first and followed by Monochoria vaginalis, Eleocharis kuroguwai, and Sagittaria trifolia, in order. Echinochloa. crus-galli and Monochoria vaginalis tillered at 5 and 8 leaf stage. Eleocharis kuroguwai started to produce tillers at 35 days after harrowing and Sagittaria trifolia produced an arrowhead-like leaf after emerging 6 or 7 leaves. Based on estimation of changes in emergence pattern and early growth of weeds, it may concluded that Echinochloa crus-galli and Eleocharis. kuroguwai were controlled effectively by one-shot herbicides application within 12~14 days after puddling, and Monochoria. vaginalis and Sagittaria trifolia by sequential application of herbicides approximately at 20 days after the first soil incorporation application at puddling time
Publication Year: 2004
Publication Date: 2004-01-01
Language: en
Type: article
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