Central Agricultural University

About: Central Agricultural University is a education organization based out in Imphal, Manipur, India. It is known for research contribution in the topics: Population & Agriculture. The organization has 1116 authors who have published 1157 publications receiving 9217 citations.

Seedling stage salt stress response specific characterization of genetic polymorphism and validation of SSR markers in rice

Abstract: Salt tolerance status at early seedling stage in 30 rice varieties including two tolerant (Pokkali and CSR-36) and two susceptible (IR-29 and IR-64) checks was assessed under different levels of salinity (0, 4, 8 and 16 dS m−1) created by salt mixture of NaCl, CaCl2, Na2SO4 in 7:2:1 ratio. Overall salinity tolerance indices clearly reflected that 17 varieties including the two tolerant checks were highly tolerant, seven varieties exhibited moderately tolerant, whereas six varieties including the two susceptible checks had highly susceptible response to salt stress. Molecular profiling of 13 tolerant and 5 susceptible rice varieties by using 24 SSR markers revealed 8.5 alleles per primer with altogether 114 shared and 91 unique allelic variants. Considering the allele number, polymorphism information content and polymorphism percent, SSR primers RM 302, RM 8094, RM 10665, RM 10694, RM 10748 and RM 10825 appeared to be highly polymorphic and comparatively more informative. Hierarchical classification and spatial distribution patterns based on amplification profiles dependent similarity indices unambiguously discriminated these 18 varieties in accordance with their salt tolerance response. Sequential exclusion of primers in further analysis led to validation of RM 140, RM 1287, RM 3412, RM 10745, RM 10764 and RM 10772 for their efficiency to distinguish salt tolerant varieties from susceptible ones. A specific combination of either four (RM 1287, RM 3412, RM 10764 and RM 10772) or even two markers (RM 1287 and RM 3412) also seemed to be equally effective in discrimination of entries according to their salt stress responsiveness. Principal coordinate analysis completely corroborated hierarchical classification of the varieties. Salt tolerance donors identified and SSR primers validated in the present study may be further utilized in the development of salt stress tolerant varieties of rice.

Assessment of Planting Method and Deficit Irrigation Impacts on Physio-Morphology, Grain Yield and Water Use Efficiency of Maize (Zea mays L.) on Vertisols of Semi-Arid Tropics.

Abstract: Agriculture in a water-limited environment is critically important for today and for the future. This research evaluates the impact of deficit irrigation in different planting methods on the physio-morphological traits, grain yield and WUE of maize (Zea mays L.). The experiment was carried out in 2015 and 2016, consisting of three planting methods (i.e., BBF, SNF, and DWF) and four irrigation levels (i.e., I10D: irrigation once in ten days, I40: irrigation at 40% DASM, I50: irrigation at 50% DASM, and I60: irrigation at 60% DASM). The results reveal that varying degrees of water stress due to planting methods and irrigation levels greatly influenced the maize physio-morphological traits and yield attributes. The combined effect of DWF + I50 benefited the maize in terms of higher leaf area, RWC, SPAD values, CGR, and LAD, followed by the SNF method at 60 DAS. As a result, DWF + I50 and SNF + I50 had higher 100 grain weight (30.5 to 31.8 g), cob weight (181.4 to 189.6 g cob-1) and grain yield (35.3% to 36.4%) compared to other treatments. However, the reduction in the number of irrigations (24.0%) under SNF + I50 resulted in a 34% water saving. Thus, under a water-limited situation in semi-arid tropics, the practice of the SNF method + I50 could be an alternative way to explore the physio-morphological benefits in maize.

Effect of Dietary Incorporation of Dry-Powdered Water Hyacinth (Eichhornia crassipes) Meal on Growth and Digestibility of Labeo rohita Fingerlings

Abstract: Keeping the importance and search for unconventional feed resources and/or standardizing their level of incorporation in mind, we incorporated dry-powdered water hyacinth (Eichhornia crassipes) meal in feeds and studied its effect on growth and digestibility in Labeo rohita fingerlings Five feeds with 30 % crude protein level were formulated using Eichhornia meal (EM) at 0 (control), 5 (EMF1), 10 (EMF2), 15 (EMF3) or 20 % (EMF4) of the diet replacing rice bran by equal proportions Three hundred fingerlings (740 ± 005 cm; 527 ± 012 g) were distributed into fifteen tanks (200 l capacity) and fed the experimental diets for 60 days In the last 30 days, digestibility studies were conducted using 05 % chromic oxide as an external marker in feed At 10 % inclusion of EM, the experimental fish showed the highest weight gain percent (WG%), specific growth rate (SGR), protein efficiency ratio and apparent net protein utilization with lowest feed conversion ratio Whereas the growth performance at 15 % inclusion level was comparable with the control and further increase to 20 % level of EM showed reduced growth responses but the feed was fairly palatable to the fish Lower digestibility was also observed in EMF4 group It is concluded that EM can be included at 15 % level in the feed of L rohita fingerlings without adversely affecting the growth, dry matter and nutrient digestibility However, economic feasibility of this feedstuff needs to be analyzed to see whether the reduced cost of diets would compensate for the reduced performance of fish at higher inclusion levels

Hydraulics of a multi-section screened well while draining ponded land in a leaky aquifer

Abstract: A transient semi-analytical solution is developed for evaluating hydraulic head distribution in a leaky aquifer while draining the surface ponded water under constant-head conditions through a well having multi-section screen. Integral transform techniques such as Laplace and finite Fourier cosine are used for deriving the semi-analytical solution. Applicability of the derived solution is verified using the field data. The developed hydraulics is used to demonstrate the effect of multi-section screen on head distribution within the aquifer. A new term, radius of partial-screening influence (R ps), is introduced in the present study. The R ps of a single/multi-section screen depends on the position(s) of the screen section(s) within the aquifer. Analyses of the results show that the radial distance beyond which the influence of multi-section (m sections, say) well screen fully penetrating the aquifer (but only partially screening it) vanishes is equal to 1/m times the aquifer thickness for the screen secti...

Genetic Variability Analysis in Bread Wheat (Triticum aestivum L.) Genotypes for Morpho-Physiological Characters and Grain Micronutrient Content

Abstract: An experiment was performed taking 30 bread wheat (Triticum aestivum L.) genotypes in the experimental area of Wheat Breeding section of DRPCAU, Pusa, Samastipur, Bihar during the Rabi season of 2019-20 to assess the genotypic and phenotypic variance, genotypic and phenotypic coefficient of variability, heritability, and genetic advance as per cent of mean. Observations were documented for fifteen characters. The evaluation was accomplished in Randomized Block Design. Significant differences were revealed by the analysis of variance among the evaluated genotypes for each of the taken parameters. Manipulation by the environment was extremely scanty in the expression of all the traits as it was marked by slight differences between the genotypic and phenotypic coefficient of variation. The characters namely, grain Zn content, grain Fe content, no. of Original Research Article Barman et al.; IRJPAC, 21(22): 1-8, 2020; Article no.IRJPAC.62791 2 tillers per plant, number of grains/ ear and flag leaf area demonstrated high heritability in addition to high genetic advance as per cent of mean pointing towards that it would be effective to employ simple selection schemes to fetch genetic enhancement in desired track for mentioned characters.