ABSTRACT
A field experiment was conducted during kharif 2022 at College of Agriculture, Kalaburagi to evaluate the effect of dates of sowing and plant geometry on yield and economics of ricebean. The experiment was laid out in Split plot design with three replications. The experiment was comprised of two factors viz., dates of sowing in main plot with four dates i.e. second fortnight of July, first fortnight of August, second fortnight of August and first fortnight of September and spacing in sub plot with three plant geometry i.e. 30 cm x 10 cm, 45 cm x 10 cm and 60 cm x 10 cm. The results of the experiment indicated that ricebean sown during first fortnight of August recorded significantly higher seed yield and stover yield (1016 kg ha-1 and 2574 kg ha-1, respectively) besides higher gross returns (?. 63547 ha-1), net returns (?. 39300 ha-1) and Benefit Cost ratio (2.62). Among different plant geometry, 30 cm x 10 cm recorded significantly higher seed and stover yield (1009 kg ha-1 and 2302 kg ha-1, respectively) besides higher gross returns (?. 62852 ha-1), net returns (? 38205 ha-1) and BC ratio (2.55). Further, it was onpar with 45 cm x 10 cm plant geometry (989 kg ha-1, 2253 kg ha-1, ?. 61583 ha-1, ?. 37355 ha-1 & 2.54, seed yield, stover yield, gross returns, net returns & BC ratio, respectively). The interaction between dates of sowing and plant geometry on yield attributes, yield and economics was found non significant.
ABSTRACT
A field experiment was conducted to study the bio-efficacy of post emergent herbicides on weeds in direct seeded rice in medium black clay soil at Agricultural Research Station, Dhadesugur, University of Agricultural Sciences, Raichur, Karnataka during Kharif 2022. The experiment was laid out in Randomized complete block design with three replications. There were eight treatments consisting of five post emergent herbicides sprayed at 25 DAS, hand weeding at 20 and 40 DAS, weed free check and weedy check in direct seeded rice and the variety RNR 15048 was used in this trial. Application of cyhalofop butyl 5.1 % + penoxsulam 1.02 % OD @ 2000 ml ha-1 recorded significantly lower weed density, weed dry weight, weed index and higher weed control efficiency compared to all the other treatments. It also produced higher number of productive tillers (409.4 m-2), panicle weight (3.89 g), filled grains per panicle (243.1), lower number of unfilled grains per panicle (8.4), higher grain yield (6058 kg ha-1) and straw yield (6935 kg ha-1) in direct seeded rice. So it can be concluded that application of cyhalofop butyl 5.1 % + penoxsulam 1.02 % OD @ 2000 ml ha-1 at 25 DAS (weeds at 2-3 leaf stage) was most effective in managing the weeds with higher weed control efficiency. It also resulted in higher growth and yield components of direct seeded rice leading to higher grain yield.