Entity

Time filter

Source Type


Jha V.B.,Irrigation Research Station | Sharma A.K.,Tilka Manjhi Bhagalpur University | Singh B.,Tilka Manjhi Bhagalpur University
Annals of Biology | Year: 2014

Forty-four early rice genotypes representing wide genetic base were grown at Rice Research Station, Bihar Agricultural College, Sabour, Bhagalpur (Bihar) with the objective to study the genetic diversity among the genotypes using Mahalanobis D2 statistics. Analysis of variance revealed significant differences among the genotypes for all eight quantitative traits under study viz., plant height, flag leaf area, total grains per panicle, fertile grains per panicle, panicle length, spikelets per panicle, 1000-grain weight and grain yield per plant. Clustering pattern revealed that they were not formed according to geographical distribution of the genotypes and the genotypes which originated even from one place occupied their positions in different clusters. Genetic divergence showed a wide range of inter-cluster D2 values ranging between 121.83 (clusters VI and Vm) and 9600.00 (clusters V and DC). The cross combinations of RR 347-166 with IR-36, Gautam and RAU-3105 and Boro 5-115 with IR-36 and Gautam may result in highly heterotic hybrids as well as superior transgressive segregants. Spikelets per panicle (38.58%) followed by fertile grains per panicle (23.58%) showed the highest contributions towards the total genetic divergence. Plant height, 1000-grain weight and flag leaf area had more or less equal contributions of 10.15 to 12.05%. However, grain yield per plant, panicle length and total grains per panicle showed least contributions to the total divergence as their total contributions were about 5% only. Source


Jha V.B.,Tilka Manjhi Bhagalpur University | Jha V.B.,Irrigation Research Station | Sharma A.K.,Tilka Manjhi Bhagalpur University | Singh B.,Tilka Manjhi Bhagalpur University
Annals of Agri Bio Research | Year: 2014

Forty-four early rice genotypes were grown at Rice Research Section, Bihar Agriculture College, Sabour, Bhagalpur (Bihar) to assess different genetic parameters for 12 quantitative traits. The mean sum of squares due to genotypes for all the characters were highly significant and indicated that the genotypes possessed inherent genetic differences. Five genotypes, namely, RAU-3115, RAU-3105, RAU 1344-3, RAU 1344-5 and RAU-3101 were statistically at par and showed superior most in terms of grain yield per plant and most of the yield attributing traits. A high degree of phenotypic and genotypic coefficients of variations were observed for grain yield per plant, flag leaf area, spikelets per panicle, grain L/B ratio and days to 50% flowering. Flag leaf area, 1000-grain weight, grain yield per plant, grain L/B ratio, days to 50% flowering, total grains per panicle, fertile grains per panicle, panicle length and spikelets per panicle exhibited high heritability estimates. High estimates of heritability coupled with high genetic advance were observed for days to 50% flowering, total grains per panicle and fertile grains per panicle indicating the preponderance of additive gene action. On the other hand, grain yield per plant, 1000-grain weight, grain L/B ratio, flag leaf area and spikelets per panicle resulted in high heritability with low genetic advance showing the existence of non-additive gene action in governing these traits. Source


Jha V.B.,Tilka Manjhi Bhagalpur University | Jha V.B.,Irrigation Research Station | Singh B.,Tilka Manjhi Bhagalpur University
Annals of Agri Bio Research | Year: 2014

Line × tester analysis for combining ability amongst 22 female lines, three male testers and 66 crosses was carried out in yam bean for days to first flowering, vine length, number of primary branches per plant, number of leaves per plant, vine weight per plant, root length, root girth and root yield per plant. Female lines ML-4, ML-13, ML-17 and ML-32 showed positive and significant gca effects consistently for root yield, root length and root girth. Generally, the lines and the testers which showed high gca effects for root yield also exhibited high gca effects for other yield contributing traits. Among testers, broad base single cross with diverse origin DC No.l × Deshi was observed to be good general combiner for all the traits except vine length. The best specific combiners for a trait were directly associated with per se performance of the crosses. Both additive × additive and additive × dominance type of gene interactions were encountered in the crosses showing the possibility of exploiting heterosis. Based on high mean performance, high × high gca of parents and high sea of crosses, two hybrids ML-13 × T-3 and ML-32 × T-3 were found to be superior over all hybrids for root yield per plant. Source


Jha V.B.,Irrigation Research Station | Rai M.P.,Tilka Manjhi Bhagalpur University | Roy S.,Tilka Manjhi Bhagalpur University | Singh B.,Tilka Manjhi Bhagalpur University
Annals of Agri Bio Research | Year: 2014

An on-farm trial was conducted at farmer's fields during kharif 2008 and 2009 with 11 early rice cultivars and one locally adopted variety as control in order to identify the most superior high yielding cultivar for adoption in up and mid land ecosystem of Gopalganj district of Bihar. Ten yield and yield attributing traits, namely, days to 50% flowering, number of productive tillers per hill, plant height, number of total grains per panicle, number of fertile grains per panicle, panicle length, harvest index, number of spikelets per panicle and 1000-grain weight and grain yield were studied. The mean sum of squares due to genotypes was found to be highly significant in individual as well as in pooled analysis indicating that the cultivars were possessing inherent genetic differences with respect to all the characters. Three varieties, namely, Rajendra Bhagwati (51.10 q), Prabhat (49.90 q) and Gautam (47.70 q) showed significant and highest grain yield/ha as compared to local variety IR-36 (37.50 q) in pooled analysis. These cultivars matured 10-20 days earlier than the control. It was observed that the cultivars performed high yield also exhibited high mean values for most of the yield attributing traits. Based on the results, Rajendra Bhagwati, Prabhat and Gautam varieties are recommended to popularize for adoption in the district for higher yield, better profitability and early harvest of the crop. Source


Prasad S.,Birsa Agricultural University | Prasad S.,Irrigation Research Station | Kumar V.,Birsa Agricultural University | Jha V.B.,Birsa Agricultural University | Prasad R.K.,Birsa Agricultural University
Annals of Agri Bio Research | Year: 2014

DTPA extractable, available and exchangeable iron contents of the soil decreased with depth, whereas active and total iron increased down the profile but decreased in the last layer. All the forms of iron were higher in the cultivated soils than that in the forest soils. DTPA extractable, available and exchangeable irons were positively and significantly correlated with exchange acidity and organic carbon content of the soil. The total and active iron contents had a positive and significant relationship with CEC and exchangeable Ca++ in the soil. Water soluble, DTPA extractable and exchangeable manganese decreased with depth in both the soil profiles, whereas reducible, active and total manganese contents increased down the profile. Water soluble, DTPA extractable and exchangeable manganese had a negative and significant relationship with soil pH and positive and significant relationship with exchange acidity and organic carbon. Source

Discover hidden collaborations