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Parthipan T.,Tamil Nadu Rice Research Institute TNAU | Ravi V.,Tamil Nadu Rice Research Institute TNAU
Research on Crops | Year: 2013

Rice is the most important cereal crop which plays major role in Indian food economy as well as dietary needs of the world. A major hindrance in the successful cultivation of rice in the tropics is heavy infestation of weeds. Hence, the field investigations were carried out at Tamil Nadu Rice Research Institute, Aduthurai during wet seasons of 2011-12 and 2012-13 to study the effect of integrated weed management on growth and yield of transplanted rice and its residual effect on succeeding blackgram. Ten weed control treatments were tested in randomised block design replicated thrice. Treatments consisted of application of pre-emergence herbicides viz., clomazone 500 g/ha, clomazone+2, 4-DEE 500 g/ha alone and their integration with one hand weeding (HW) on 45 DAT; butachlor 1250 g/ha+HW on 45 DAT; pretilachlor 500 g/ha+HW on 45 DAT; post-emergence herbicide bispyribac sodium 25 g/ha on 15 DAT + HW on 45 DAT and pre-plant incorporation of glyphosate 2.5 1/haat 15 days before transplanting followed by (fb) pre-emergence application of bensulfuron methyl plus pretilachlor 660 g/ha on 3 DAT tested with two hand weedings on 25 and 45 DAT and unweeded control. The results revealed that the lowest weed dry weight and higher grain yield were recorded under two hand weedings and this was at par with application of bispyribac sodium 25 g/ha on 15 DAT fb HW on 45 DAT. Reduction in grain yield to the tune of 47.02 and 53.79% was recorded by unweeded control during both the years, respectively. The results indicated that the herbicides applied in rice did not show their residual effects on succeeding blackgram.

Radhamani T.,Tamil Nadu Rice Research Institute TNAU | Sassikumar D.,Tamil Nadu Rice Research Institute TNAU | Packiaraj D.,Tamil Nadu Rice Research Institute TNAU | Packiaraj D.,Center for Plant Breeding and Genetics | And 2 more authors.
Vegetos | Year: 2015

Dry bold unhusked seeds of paddy variety ADT (R ) 47 were exposed to gamma rays (150 gy, 200 gy, 250 gy, 300 gy, and 350 gy) and with EMS (80 mM, 100 mM, 120 mM, 140 mM and 160 mM). The M4 generation comprising 652 mutants derived through pedigree selection was raised during rabi 2014. The analysis of variance for seven quantitative traits revealed that the mean sum of squares due to mutant genotypes were highly significant for all the characters studied indicating genetic variability among the mutants. Genotypic coefficient of variability (GCV) and phenotypic coefficient of variability (PCV) were moderate for number of productive tillers and single plant yield. High heritability coupled with high genetic advance were observed in no of productive tillers per plant and single plant yield and high heritability coupled with moderate genetic advance were recorded in the traits viz., panicle weight and 100 grain weight indicated that genetic improvement could be done by simple phenotypic selection. High heritability coupled with low genetic advance were recorded in the traits viz., days to fifty percent flowering, plant height, panicle length indicated that the traits could be exploited by heterosis breeding. © 2015, Society for Plant Research. All rights reserved.

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