EFFECT OF WEED MANAGEMENT PRACTICES ON GROWTH AND YIELD OF WET SEEDED RICE (Oryza sativa L.)
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Date
2012-07-01
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Abstract
EFFECT OF WEED MANAGEMENT PRACTICES ON GROWTH AND YIELD WET SEEDED RICE (Oryza sativa L.)
MALLIKARJUN 2012 A. S CHANNABASAVANNA
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ABSTRACT
A field experiment was conducted at Agricultural Research Station, Malnoor during kharif 2011, to investigate the effect of weed management practices on growth and yield of wet seeded rice (Oryza sativa L.). The study involves the application of butachlor (50 EC), anilophos (30 EC) and oxyfluorfen (23.5 EC) alone as pre-emergent or each of these herbicides were followed by the application of post emergent herbicides viz., 2, 4 –D sodium salt (80% WP), bispyribac sodium (10% SC) and hand weeding at 25 DAS. These treatments were compared with hand weeding thrice, weed free check and weedy check. The treatments were replicated three times in randomized block design.
Significantly higher grain yield per hectare was noticed with sequential application of butachlor fb bispyribac sodium (4871 kg ha-1) or 2, 4-D sodium salt (4801 kg ha-1) or hand weeding at 25 DAS (4671 kg ha-1) over unweeded check. The increase was to the tune of 61.73 %, 61.17 % and 60.09 %, respectively over unweeded check and was on par with hand weeding thrice. The higher grain yield in rice was mainly attributed to higher yield attributes like number of panicles per sq.m, number of grains per panicles and test weight. The sequential application of butachlor fb bispyribac sodium (89.5 %) or 2, 4-D sodium salt (88.3 %) or hand weeding at 25 DAS (87.1 %) recorded higher weed control efficiency and lower weed index (4.57, 5.93 & 8.31 %, respectively) over unweeded check.
The Maximum net returns and BC ratio was obtained with sequential application of butachlor fb 2, 4-D sodium salt (Rs. 34708 ha-1 and 3.04) followed by butachlor fb bispyribac sodium (Rs. 34154 ha-1 and 2.87) and hand weeding thrice (Rs. 33352 ha-1 and 2.77) which were on par with each other. The weed free check/hand weeding thrice recorded higher grain yield and gross return but, lesser net returns because of high cost of cultivation particularly cost incurred for the hand weeding was higher compared to the use of herbicides. The study indicated that sequential application of butachlor fb bispyribac sodium or 2, 4-D sodium salt or hands weeding at 25 DAS were optimum and it could be economically adopted in weed management in wet seeded rice.
Description
EFFECT OF WEED MANAGEMENT PRACTICES ON GROWTH AND YIELD OF WET SEEDED RICE
(Oryza sativa L.)
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