Abstract
1. β-naphthoxyacetic acid (NOXA) was sprayed on young plants of Bhutmuri 36, of the aus variety of rice (Oryza sativa). Two dosage levels-2 p.p.m. and 80 p.p.m.-and three frequency levels-once, twice, and three times-were employed. Yield was interpreted as the dry weight of grains containing endosperm. 2. In comparison with the untreated control, three NOXA treatments were found to significantly enhance yield: 2 p.p.m. applied once, 2 p.p.m. applied twice, and 80 p.p.m. applied three times. 3. It was found that the enhanced rice yield could be attributed to increases in the number of productive tillers, to increases in number of grains per tiller, or to both. 4. For the pooled data, yield was correlated +.986 with the number of grains containing endosperm, and the multiple correlation of number of tillers and number of grains per tiller on yield was +.926.
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