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Combining ability for yield & yield contributing characters in rice (Oryza sativa L.)
P. Satheesh kumar, K. Saravanan and T. Sabesan
Electronic Journal of Plant Breeding , 2010,
Abstract: A line X tester analysis was made in rice with seven ovule parents and four pollinator parents so as to identify suitable generaland specific combiner for breeding program. Dominant type of gene action for all the six traits namely, days to 50 percentflowering, plant height, number of productive tillers per plant, number of grains per panicle, hundred grain weight and grainyield per plant was observed. Parents JAYA and CRAC 2221-67 were good general combiners for grain yield per plant andmost of the yield traits. The cross combinations CRAC2221-67 x JAYA and IR6331-1-B-3R-B-24-3 X JAYA were the bestspecific combiners for grain yield per plant. Hence, these two cross combinations may be used for exploitation of heterosis foryield and yield contributing traits in rice.
Influences of nitrogen and potassium top dressing on yield and yield components as well as their accumulation in rice (Oryza sativa)
MA Bahmanyar, SS Mashaee
African Journal of Biotechnology , 2010,
Abstract: This research was conducted to investigate the effects of different rates of nitrogen (N) and potassium (K) top dressing on grain yield and yield components of rice (Oryza sativa cv. Tarrom) and to investigate N and K content of upper leaves analyzed at ten different times. A pot experiment was carried out on a completely randomized design with seven replications under greenhouse conditions at the Experiment Station of Sari Agricultural Sciences and Natural Resources University, Iran, during the growing season in 2008. Nitrogen was applied in the form of urea (46% N) at the rates of 0, 23 and 46 kg N ha-1 and potassium in the form of potassium chloride (60% K2O) at the rates of 0, 30 and 60 kg K2O ha- 1. Results indicated that panicle length, plant height, number of tiller, number of grain per panicle, hollow grain percentage, grain and biological yield were significantly affected by N and K fertilization. Maximum grain yield (75.46 g pot-1) occurred at 23 kg N ha-1 and 30 kg K2O ha-1. At flowering stage, K content of stems were higher than leaves, and N content in flag leaves was higher than other plant parts.
Quantitative Genetic Analysis for Yield and Yield Components in Boro Rice (Oryza sativa L.)  [cached]
Supriyo CHAKRABORTY,Pradip K. DAS,Biswajit GUHA,Kalyan K. SARMAH
Notulae Scientia Biologicae , 2010,
Abstract: Twenty-nine genotypes of boro rice (Oryza sativa L.) were grown in a randomized block design with three replications in plots of 4m x 1m with a crop geometry of 20 cm x 20 cm between November-April, in Regional Agricultural Research Station, Nagaon, India. Quantitative data were collected on five randomly selected plants of each genotype per replication for yield/plant, and six other yield components, namely plant height, panicles/plant, panicle length, effective grains/panicle, 100 grain weight and harvest index. Mean values of the characters for each genotype were used for analysis of variance and covariance to obtain information on genotypic and phenotypic correlation along with coheritability between two characters. Path analyses were carried out to estimate the direct and indirect effects of boro rice’s yield components. The objective of the study was to identify the characters that mostly influence the yield for increasing boro rice productivity through breeding program. Correlation analysis revealed significant positive genotypic correlation of yield/plant with plant height (0.21), panicles/plant (0.53), panicle length (0.53), effective grains/panicle (0.57) and harvest index (0.86). Path analysis based on genotypic correlation coefficients elucidated high positive direct effect of harvest index (0.8631), panicle length (0.2560) and 100 grain weight (0.1632) on yield/plant with a residual effect of 0.33. Plant height and panicles/plant recorded high positive indirect effect on yield/plant via harvest index whereas effective grains/panicle on yield/plant via harvest index and panicle length. Results of the present study suggested that five component characters, namely harvest index, effective grains/plant, panicle length, panicles/plant and plant height influenced the yield of boro rice. A genotype with higher magnitude of these component characters could be either selected from the existing genotypes or evolved by breeding program for genetic improvement of yield in boro rice.
Genetic Architecture, Inter-relationship and Selection Criteria for Yield Improvement in Rice (Oryza sativa L.)
S.K. Yadav,P. Pandey,B. Kumar,B.G. Suresh
Pakistan Journal of Biological Sciences , 2011,
Abstract: This study has been conducted to determine the extent of genetic association between yield of Rice (Oryza sativa L.) and its components. The present experiment was carried out with 40 Rice (Oryza sativa L.) genotypes which were evaluated in a randomized block design with 3 replications during wet season of 2007 and 2008. Results showed that sufficient amount of variability was found in the entire gene pool for all traits studied. Higher magnitude of genotypic and phenotypic coefficients of variation was recorded for seed yield, harvest index, biological yield, number of spikelets per panicle, flag leaf length, plant height and number of tillers indicates that these characters are least influence by environment. High heritability coupled with high genetic advance as percent of mean was registered for seed yield, harvest index, number of spikelets per panicle, biological yield and flag leaf length, suggesting preponderance of additive gene action in the expression of these characters. Grain yield was significantly and positively associated with harvest index, number of tillers per hill, number of panicle per plant, panicle length, number of spikelet's per panicle and test weight at both genotypic and phenotypic levels. Path coefficient analysis revealed that harvest index, biological yield, number of tillers per hill, panicle length, number of spikelets per panicle, plant height and test weight had direct positive effect on seed yield, indicating these are the main contributors to yield. From this study it may be concluded that harvest index, number of tillers per hill, panicle length and number of spikelet per panicle and test weight are the most important characters that contributed directly to yield. Thus, these characters may serve selection criteria for improving genetic potential of rice.
Correlation and Path Co-efficient Analysis for Yield and its Components in Rice (Oryza sativa L.)  [PDF]
Muhammad Saif-ur-Rasheed,Hafeez Ahmad Sadaqat,Muhammad Babar
Asian Journal of Plant Sciences , 2002,
Abstract: Investigation of path coefficient analysis for yield and yield components in rice (Oryza sativa L.) was conducted involving 15 genotypes. Analysis of variance indicated highly significant differences among the genotypes for all the traits studied. Covariance studies reflected significant to highly significant as well as negative differences among majority of character combinations. Broad sense heritability estimates for productive tillers per plant, grain yield per plant and plant height ranged from 0.55 to 0.705. All the traits viz. total number of tillers, number of productive tillers, flag leaf area, straw yield, harvest index and fertility index except plant height revealed significant genotypic correlation to grain yield. Among the characters studied, harvest index depicted the highest direct contribution of 0.665 and fertility index show highest indirect contribution of 0.873 towards grain yield. Path coefficient analysis demonstrated that harvest index, straw yield and fertility index should be improved for the improvement of grain yield.
Assessment of genetic variability for yield and its component characters in rice (Oryza sativa L.)
Sangam Kumar Singh,Chandra Mohan Singh,G. M. Lal
Research in Plant Biology , 2011,
Abstract: Eighty one rice (Oryza sativa L.) genotypes were evaluated during kharif 2010 forthirteen quantitative traits to examine the nature and magnitude of variability,heritability (broad sense) and genetic advance. Analysis of variance revealed that thedifferences among eighty one genotypes were significant for all the characters except flagleaf width. Among the all traits number of spikelets per panicle exhibited high estimatesof genotypic coefficient of variation (GCV) and phenotypic coefficient of variation (PCV)followed by harvest index, grain yield per hill and number of panicles per hill. Broadsense heritability was highest for biological yield per hill, which suggested that this traitwould respond to selection owing their high genetic variability and transmissibility.Maximum genetic advance as per cent of mean was recorded for number of spikelets perpanicle with high value of heritability.
Optimum Plant Density for High Yield in Rice (Oryza sativa L.)  [PDF]
A. W. Baloch,A. M. Soomro,M. A. Javed,M. Ahmad
Asian Journal of Plant Sciences , 2002,
Abstract: Three mutant strains basmati 370-32, Jajai 77-30 and Sonahri sugdasi-6 along with their respective mother varieties Basmati 370, Jajai 77, sonahari sugdasi and check variety Basmati 385 were evaluated under different plant population (spacings: 20 x 20 cm2, 22.5 x 22.5 cm2 and 25 x 25 cm2 between plants and rows) for grain yield and yield contributing parameters. An increase in spacing induced vigorous plant growth as well as increased the number of panicles per hill, grain yield per hill, filled grains per panicle and 1000 grain weight. The spacing 22.5 x 22.5 cm2 proved more appropriate because it produced better plant stand, gave more panicle density and higher grain yield than other two spacings. The mutant strain Jajai, 77-30 produced significantly (P<0.01) higher grain yield at all spacings as compared with all other entries.
Optimum Plant Density for High Yield in Rice (Oryza sativa L.)  [PDF]
A. W. Baloch,A. M. Soomro,M. A. Javed,M. Ahmed
Asian Journal of Plant Sciences , 2002,
Abstract: Three mutant strains Basmati 370-32, Jajai 77-30 and Sonahri Sugdasi-6 along with their respective mother varieties Basmati 370, Jajai 77, Sonahri Sugdasi and check variety Basmati 385 were evaluated under different plant population (spacings, 20 x 20 cm2, 22.5 x 22.5 cm2 and 25 x 25cm2 between plant and rows) for grain yield and yield contributing parameters. An increase in spacing induced vigorous plant growth as well as increased the number of panicles per hill, grain yield per hill, filled grains per panicle and 1000 grain weight. The spacing 22.5 x 22.5 cm2 proved more appropriate because it produced better plant stand, gave more panicle density and higher grain yield than other two spacings. The mutant strains Jajai77-30 produced significantly higher grain yield at all spacings as compared with all other entries.
EFFECT OF NITROGEN FERTILIZERS ON GROWTH, YIELD AND QUALITY OF HYBRID RICE (ORYZA SATIVA)  [PDF]
INDIRA CHATURVEDI
Journal of Central European Agriculture , 2006,
Abstract: A fi eld trial to determine the effect of different nitrogenous (N) fertilizers on growth, yield and quality of hybrid rice variety ‘Proagro 6207’, comprising of 10 different treatments using randomized complete block design with three replications was conducted at Agricultural Research Station, Bilaspur Chhattisgarh, India. The two years data during 2002 and 2003 revealed that all the growth characters, yield parameters and grain nitrogen (N) increased signifi cantly with an application of sulphur-containing nitrogen fertilizer- Super Net. These results were statistically at par with that of treatment T4, where ammonium sulphate nitrate was applied. In this series of experiment, non-sulphur-containing nitrogen fertilizer, urea gave lowest yield and grain nitrogen (N) content and these reductions were signifi cant in all of the experiments.
Effect of Organic Fertilizer on Growth and Yield Components in Rice (Oryza sativa L.)  [cached]
Morteza Siavoshi,shankar laxman laware,Shankar. L. Laware
Journal of Agricultural Science , 2011, DOI: 10.5539/jas.v3n3p217
Abstract: In order to study the effect of organic fertilizer on growth and yield components in rice, an experiment was carried out in 2008 and 2009, in randomized block design based on 4 replications. The chicken manure, cow manure and paddy rice were mixed together in 1:1:0.5 ratio to from organic fertilizer. The treatments of organic fertilizer were given in 5 levels (0.5, 1.0, 1.5, 2.0 and 2.5 ton/ha). At one level organic fertilizer 1.5 ton/ha was mixed with inorganic fertilizers (N-50, P-25, K-25 kg / ha) and recommended dose of inorganic fertilizer-NPK (N=100, P=50, K=50 kg/ha) was used as check. The plants without treatments were served as control. Grain yield and its components were significantly increased in all the treatments over control. The maximum grain yield in 2008 (4335.88 kg/ha) was noted in plants treated with 2 ton/ha organic fertilizer and it was (4662.71 kg/ha) for 2009 for plant treated with combination of chemical fertilizer + 1.5 ton/ha organic fertilizer. An increase in the grain yield at the abovementioned treatments was may be due to the increase of 1000-seed weight, panicle number, number of fertile tiller, flag leaf length, number of spikelet, panicle length and decrease number of hollow spikelet per panicle.
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