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Phosphorus Requirements of Mungbean (Vigna radiata L.) Wilczek in Selected Soils of South Eastern Nigeria using Sorption Isotherms

Author(s) agree that this article remain permanently open access under the terms of the Creative Commons Attribution License 4.0 International License

Abstract. The phosphorus requirements of Mungbean (Vigna radiata) in soils derived from Ikom, basalt (BS), Akamkpa, basement complex (BC) and Umudike, Coastal Plain sands (CPS) in South-Eastern Nigeria were estimated using the P-Sorption Isotherms. Soil samples were collected at 0-15 cm depth and the processed method used involved equilibrating 3 g of soil in 30 ml of 0.01m CaCl2 containing 0,5,10,20 and 25 μgg-1 P at room temperature for 5 days. From the P sorption curves, the standard P requirement for the three soils was calibrated and phosphorus requirement of the soils for optimum growth and yield of Mungbean were found to be very low. Different phosphorus levels were calibrated from the sorption isotherm curves and used in fertilizing mungbean in a split-plot potted experiment in completely randomized design (CRD) with three replications. The soil types occupied the main plots while the P levels were assigned to the subplots. A significant response of the mungbean to the applied phosphorus in terms of modulation and grain yield at 5% probability level was observed. Solution concentration of 0.4 μgg-1 in Ikom gave the best nodulation, while Umudike gave the optimum grain yield. The mungbean performed best in Ikom with yield of 9.16 g per plant and least in Akamkpa with a yield of 0.53 g per plant. The use of P–isotherm technique for P fertilizer determination is therefore recommended for efficient P fertilization practice in soils of Southern Eastern Nigeria.

Keywords: fertilizer, grain yield, mungbean, phosphorus, soil types, sorption

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DOI: http://dx.doi.org/10.12983/ijsras-2015-p0022-0033

 

Biochemical Characterization of Defatted Meal of Different Accessions of Simmondsia chinensis (Link) C. K. Schneid. (Jojoba)

Author(s) agree that this article remain permanently open access under the terms of the Creative Commons Attribution License 4.0 International License

Abstract. Jojoba (Simmondsia chinensis, family Simmondsiaceae) seeds of six different accessions were used for extraction of oil and defatted meal. Seed samples were analyzed for oil, protein, carbohydrate, total free amino acids and polyphenolic contents. Significant differences among the accessions were found for oil, protein and carbohydrate contents. The highest oil content (51.53%) was obtained in Accession 82-18 and the lowest oil content (49.24%) in accession CMSCRI. Protein content of defatted seed meal ranged from 27.25% (MS) to 30.56% (47-21) and carbohydrate content varied from 49.8% (40) to 56.53% (MS). Chemoprofiling studies showed 47-21 accession will be used for commercial applications.

Keywords: Jojoba, polyphenolic contents, Simmondsia chinensis and soxhlet apparatus

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DOI: http://dx.doi.org/10.12983/ijsras-2015-p0034-0038

 

Growth Traits and Estimated Heritability by Variance Component for Dhofari Calf Breed

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Abstract. Dhofari calf breed weight variations at similar age indicate their potentiality for genetic improvement by careful selection. The present study was carried out to find the average growth traits of birth weight (BW), weaning weight(WW), yearling weight(YW), pre-weaning daily gain(PRE), post-weaning daily gain(POS) and the effect of dam age, season, sex, and year of birth on the variance of these traits. In addition, the estimated heritability of these traits by estimating the (co)variance components was the second objective of this study. Data of 556 Dhofari breed calves from Salalah Livestock Research Station were used and statistically analyzed by SPSS, GLM, Duncan test and Linear Mixed model with restricted maximum likelihood(REML). Average of growth traits for birth weight (BW), weaning weight (WW), yearling weight (YW), pre-weaning daily gain (PRE), and post-weaning daily gain (POS) were 17.83 ±0.10, 85.11 ±0.60, 160.27 ±1.30 kg, 639.30 ±5.20, and 235.69±5.86 g/d respectively. Phenotypic Pearson correlation analysis of growth traits showed high significance (P<0.01) between BW, WW, and YW. There was a significant (P< 0.05) effect of dam age, season, sex, and year of birth on all studied traits. Analysis (Duncan test) showed highest (P<0.05) effect of dam age (> 9 years old), season (spring), and sex (males) for all growth traits. Analysis of estimated variance components revealed heritability estimates for BW, WW, YW, PRE, and POS of 0.23 ±0.80, 0.41 ±0.86, 0.58 ±0.93, 0.40 ±0.85, and 0.59 ±0.92 respectively.

Keywords: Dhofari calf, Growth traits, Heritability, Pearson correlation, Variance components

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DOI: http://dx.doi.org/10.12983/ijsras-2015-p0039-0044

 

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