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Not AvailableSystem of Rice Intensification (SRI) as an alternate rice cultivation methodology, developed in Madagascar 25 years ago, is gaining wider acceptance in many countries including India. SRI method claims to greatly enhance water productivity and grain yield. But there is lack of understanding of scientific principles underlying and synergetic effects of the principles followed in SRI, especially in Indian conditions. The present paper is intended to discuss about significance and necessity of SRI along with performance of SRI at about 25 locations across the country for a period of four years. SRI was found to record 7- 20% higher grain yield over the traditional irrigated transplanted rice in different agro-climatic situations of the country. SRI also recorded higher nutrient use efficiency without depleting soil available nutrients as compared to conventional transplanting"after two seasons of the study. The varieties having better tillering ability as well as hybrids (KRH 2, HRI 126, PHB 71 and DRRH 2) were found promising and recorded higher grain yield over the high-yielding varieties and scented cultivars with moderate tillering. Root volume, dry mass and dehydrogenase activity in soil enhanced by 7-25% (measure of microbial activity) were found to be higher in SRI, compared with conventional method. There was reduction in seed rate by 80%, nursery area also obviously, water requirement by 29% and growth duration by 8-12 days, thereby enhancing water productivity and per day productivity of rice cultivars in SRI, which also proved to be helpful in producing more seed for faster seed multiplication and also quality seed for higher productivity. Water saving alone should be a strong justification for the adoption of SRI wherever water is not abundant. Ther~ is a need for further enhancing the rice productivity in SRI by identifying suitable cultivars, modifying practices to suit local agro-climatic conditions and understanding long term synergic effects among different practices.Not Availabl

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Not AvailableRice is generally shows variable level of sensitivity to salinity during its developmental stages and remarkably sensitive during young seedling stage and early reproductive phase. Quantifying the level of salt tolerance based on salt stress indices is an effective method in identification of tolerant genotypes. In this study, the salt stress indices were used to identify best performing genotypes based on salt susceptibility indices (SSI) and salt response indices (SRI) as relevant parameters. Among the 39 genotypes studied, 29 showed better endurance to salt susceptibility indices, among them Pokkali, IR72132-AC-6-1 and IR70869-B-P-13-2 performed well with least SSI, which refers more tolerance with lesser yield reduction, whereas IR29 was vice-versa to the above. Genotypes IR72593-B-19-2-3-1, IR73104-B-1-1-3-2-1 and IR74802-3R-7-1-2 had a better performance with early flowering and highly responsive to salt stress with lower percent yield reduction. The phenotypic variation is higher than genotypic variation for all traits except for flowering duration and it indicates presence of variability for different traits. High heritability with variability, genetic advance and better salt stress indices indicates involvement of additive gene action and can be manipulated and utilized in further breeding program.Not Availabl

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Not AvailableRice is generally shows variable level of sensitivity to salinity during its developmental stages and remarkably sensitive during young seedling stage and early reproductive phase. Quantifying the level of salt tolerance based on salt stress indices is an effective method in identification of tolerant genotypes. In this study, the salt stress indices were used to identify best performing genotypes based on salt susceptibility indices (SSI) and salt response indices (SRI) as relevant parameters. Among the 39 genotypes studied, 29 showed better endurance to salt susceptibility indices, among them Pokkali, IR72132-AC-6-1 and IR70869-B-P-13-2 performed well with least SSI, which refers more tolerance with lesser yield reduction, whereas IR29 was vice-versa to the above. Genotypes IR72593-B-19-2-3-1, IR73104-B-1-1-3-2-1 and IR74802-3R-7-1-2 had a better performance with early flowering and highly responsive to salt stress with lower percent yield reduction. The phenotypic variation is higher than genotypic variation for all traits except for flowering duration and it indicates presence of variability for different traits. High heritability with variability, genetic advance and better salt stress indices indicates involvement of additive gene action and can be manipulated and utilized in further breeding program.Not Availabl

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Not AvailableThe experiment was conducted out at the Indian Institute of Rice Research, Rajendranagar, Hyderabad during dry season (Rabi) 2013-2014 and Wet season (Kharif) 2014 crop seasons. The objective was to establish the nature of relation between grain yield and yield components by partitioning the correlation co-efficients between grain yield and its components into direct and indirect effects by using simple correlation and path analysis. A correlation co-efficient and path analysis study was conducted with eleven parents and their 24 F1 crosses for eleven component characters including grain yield. The correlation studies of these crosses showed that, grain yield per plant exhibited highly significant positive association with plant height, number of productive tillers per plant, panicle length, grains per panicle, and harvest index while days to 50 per cent flowering registered non-significant negative association with grain yield.ICAR-Indian Institute of Rice Researc

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Not AvailableThe experiment was conducted out at the Indian Institute of Rice Research, Rajendranagar, Hyderabad during dry season (Rabi) 2013-2014 andWet season (Kharif) 2014 crop seasons. The objective was to establish the nature of relation between grain yield and yield components by partitioning the correlation co-efficients between grain yield and its components into direct and indirect effects by using simple correlation and path analysis. A correlation co-efficient and path analysis study was conducted with eleven parents and their 24 F1 crosses for eleven component characters including grain yield. The correlation studies of these crosses showed that, grain yield per plant exhibited highly significant positive association with plant height, number of productive tillers per plant, panicle length, grains per panicle, and harvest index while days to 50 per cent flowering registered non-significant negative association with grain yield.Not Availabl

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Not AvailableDRR Dhan 55 [IET 26194(RP 5591 - 123 - 16 - 2)], an aerobic rice variety developed from MTU1010/ IR79915 - B - 83 - 4 - 3 cross combination. It was evaluated in AICRIP multi - location aerobic rice trials during wet seasons of 2016 to 2019. DRR Dhan 55 consistently out - performed the check varieties in Eastern Zone (Zone III) and Central Zone (Zone V) with a mean grain yield 4974 kg/ha, which is 15%, 19% and 18 % higher than National check, Zonal and Local checks, respectively. In addition, it exhibited moderate resistance to Leaf blast and Neck blast; and also resistance to gall midge and rice thrips; and moderate resistance to plant hoppers. DRR Dhan 55 has medium duration of 120 - 130 days (seed to seed) and possess desirable grain andcooking quality parameters. It was released for cultivation in aerobic ecosystems of Bihar (Zone III) and Chhattisgarh (Zone V) states through Central Sub - committee on Crop Standards, Notification and Release of Varieties for Agricultural Crops vide S.O. 500(E) dt. 29th Jan 2021[CG - DL - E - 03022021 - 224901].Not Availabl