Effects of number of fungicide application on groundnut yield
1987
Songchao Insomphun | Veerachai Sriwattanapongse (Chiang Mai Univ., Chiang Mai (Thailand). Faculty of Agriculture. Dept. of Agronomy)
Efficacy of different number of fungicide sprays in controlling leaf spots and rust was evaluated on Tainan 9 groundnut at Chiang Mai University during July to November 1985. Mancozeb (360 g/rai/application) and chlorothalonil 270 g/rai/application were two selected fungicides used in the experiment. The plants were sprayed 1, 2, 3, 4 and 5 times at 2 weeks interval starting at 10, 8, 6, 4 and 2 weeks after the emergence respectively. Mancozeb and chlorothalonil were equally effective in controlling the diseases when applied 4 or 5 times throughout the season. The highest seed yield of 350.5 and 351.0 kg/rai were obtained with 4 and 5 applications respectively. Two and three applications gave a moderate level of protection resulting in yield of 301 and 315.9 kg/rai when 1 and 0 application yield only 248.5 kg/rai respectively. The yield increase in response to the number of fungicide spray was due to a marked increase in number of pods/hill, 100 seed weight and shelling percentage.
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