STANDARDIZATION OF AGRO-TECHNIQUES FOR MECHANIZED SYSTEM OF RICE (Oryza sativa L.) INTENSIFICATION
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Date
2015-08-06
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UNIVERSITY OF AGRICULTURAL SCIENCES GKVK, BENGALURU
Abstract
Field experiments were conducted at Zonal Agricultural Research Station, V. C.
Farm, Mandya during kharif 2013 and 2014 to standardize the agro-techniques for
mechanized SRI. The experimental soil was red sandy loam, moderately acidic in nature
(pH 5.45) and medium in organic carbon content (0.43 %). Two experiments were laid
out in randomized block design with three replications using rice hybrid KRH-4. The
study on age of seedling, time of nitrogen application and weed management indicated
that planting 15 days old seedling through transplanter at wider row spacing (23 cm × 23
cm) with nitrogen in 4 splits (25 % each during basal, 30 DAT, 60 and 75 DAT) and preemergent
application of bensulfuron methyl + pretilachlor (6.6 G) at 3 DAT followed by
conoweeding at 25 DAT recorded significantly higher grain yield and B:C ratio (8303 kg
ha-1 and 3.74, respectively) was comparable with mannual SRI (8587 kg ha-1 and 3.60,
respectively). Significantly higher grain yield and B:C ratio (8012 kg ha-1 and 3.78,
respectively) were obtained with providing irrigation at 2 days after disappearance of
ponded water throughout the crop growth stage as compared to 4 and 6 DADPW. Among
fertilizer levels, higher yield (7979 kg ha-1) and water productivity (70.12 kg ha-cm-1)
were observed with the application of 150 per cent RDF than 125 per cent and 100 per
cent RDF.
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