Vol. 11, Issue 11 (2022)

A field experiment was carried out at the College Farm, N. M. College of Agriculture, Navsari Agricultural University, Navsari during kharif season of 2014. Ten treatments viz., T₁ -weed free up to 15 DAS, T₂ -weed free up to 30 DAS, T₃ -weed free up to 45 DAS, T₄ -weed free up to 60 DAS, T₅ -weed free up to harvest, T₆ -weedy up to 15 DAS, T₇ - weedy up to 30 DAS, T₈ -weedy up to 45 DAS, T₉ -weedy up to 60 DAS and T₁₀ -weedy up to harvest, were evaluated on aerobic rice Cv. NAUR-1. The experiment was laid out in Randomized Block Design with three replications. Various growth parameters and yield attributing characters of aerobic rice crop viz., plant height, number of tillers, number of panicle/m², length of panicle, number of grains/panicle, grain and straw yields significantly varied due to various treatments. The results revealed that significantly the highest values of all growth parameters and yield attributing characters were recorded under the treatment T₅ -weed free up to harvest, which were at par with treatments T₄ -weed free up to 60 DAS and T₆ -weedy up to 15 DAS, Ultimately the higher grain yield (40.6 q/ha) was obtained under treatment T₅ i.e. weed free up to harvest being statistically at par with the treatment T₄ (36.9 q/ha) and T₆ (36.0 q/ha). The highest net realization of ₹ 28300 per ha was obtained with treatment T₄ (weed free up to 60 DAS) followed by treatment T₅. Similarly maximum BCR value of 2.03 was also recorded with treatment T₄ (weed free up to 60 DAS). It can be concluded for getting higher yield and better economic return, aerobic rice should be keep weed free up to 60 DAS from that 45 to 60 DAS is more crucial for critical crop – weed competition.