Abstract
Experiments were carried out during 1982–1984 in Chara-infested areas under farmer's-field conditions. Under the worst crop-weed competition, the alga accumulated ∼ 1060 kg dry matter ha −1 and removed 21.14 kg N ha −1 causing a reduction in rice yield of ∼41%. For safe, effective and economic control of Chara, a pre-emergence spray application of oxadiazon at 2 kg ha −1 was found to be highly effective and comparable to the efficacy of copper sulphate at 16 kg ha −1. The dose of copper sulphate could be reduced to 0.75 kg ha −1 when applied in combination with an equal amount of oxadiazon. Combined application of these two herbicides was found to be much more effective than their single application. Postemergence application of the herbicides by means of mud balls, sand mix or the usual spray was ineffective.
Published Version
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