KRISHNAMURTHY, NSOWMYALATHA, B. S.2017-08-092017-08-092015-08-06Th-11171http://krishikosh.egranth.ac.in/handle/1/5810027970Field 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.ennullThesis