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Journal of Agronomy
eISSN: 1812-5417
pISSN: 1812-5379

Editor-in-Chief:  Francisco Fabian Fuentes Carmona
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Research Article
Genotypic Responses of Brachiaria Grass (Brachiaria spp.) Accessions to Drought Stress
Duncan Cheruiyot, Charles Aura Odhiambo Midega, Johnnie Van den Berg, John Anthony Pickett and Zeyaur Rahman Khan
Background and Objective: Brachiaria, a warm season C4 grass, is rapidly gaining popularity as fodder crop in Africa where it is also used as a component of a habitat management strategy for maize stem borers. However, increasing drought limits productivity of this grass species. The aim of this study was to evaluate and select high yielding brachiaria genotypes under simulated drought conditions. Materials and Methods: The morphological and physiological performance of 18 apomictic accessions of brachiaria in simulated drought conditions in a screen house were evaluated. Plants were exposed to different watering regimes. Well-watered (control) plants were watered every 48 h to 100% field capacity while drought was simulated by suspending watering for 14 and 28 days, representing moderate and severe drought conditions, respectively. Shoot length, leaf length and width, number of tillers, leaf relative water content, chlorophyll content and above ground biomass were studied. Result: Water stress had negative effects on the morphological and physiological traits, with the effects being more pronounced under severe drought stress. Based on the drought stress index (DSI) values for the measured parameters and Principal Component of Analysis (PCA) biplots, the following accessions were least affected under severe drought stress: ‘Xaraes’, ‘Piata’, ‘Marandu’, ‘CIAT 679’, ‘Mulato II’ and ‘Mulato I’. Conclusion: Under increasing drought conditions, biomass yield was an accurate predictor of drought tolerance of the genotypes. ‘Piata’ and ‘Xaraes’ combined both drought tolerance and biomass yield. These two accessions were proposed as of value in improvement of the sustainability of cereal-livestock farming systems under conditions of increasing aridification.
Research Article
Effect of Fungicide Application on Some Nutritional and Anti-nutritional Composition of Colocassia esculenta (Cocoyam)
Thecla Nchedo Mbah, Adanma Chiemeziem Obike, Emmanuel Uchenna Ejiofor, Gavin Chibundu Ikechukwu, Gabriel Chinedu Mbah and Yusuf Ndukaku Omeh
Background and Objective: Staple food remain the major source of foods in Nigeria and West Africa. However, due to challenge of diseases, there have been a lot of setbacks in its farming and processing. This study investigated if application of fungicide affects nutritional composition of Colocassia esculenta (cocoyam). Materials and Methods: Fungicide was applied foliarly and farming season lasted for 8 months. All farming conditions for proper growth of the cocoyam were achieved. At the end of farming, amino acid analysis, phytochemicals and nutrient composition were determined using standard protocols. Results: Result obtained showed reduced phytocompounds in the control group when compared to the test group treated with the fungicide. Alkaloid (1.72±0.55, 3.07±0.18), flavonoid (3.96±0.95, 4.31±0.03), Tannins (0.65±0.22, 0.17±0.05), saponin (1.81±0.01, 3.00±0.05), Glycoside (5.26±0.10, 9.23±0.20), oxalate (0.58±0.03, 1.98±0.16) and phytate (0.31±0.03, 1.51±0.10) in control and test group respectively. Result for proximate composition showed reduced crude fibre (3.43±0.24, 1.12±0.07), starch (20.33±0.32, 15.50±0.57), amylose (6.72±0.16, 4.97±0.09) and lipid content (1.85±0.28, 0.96±0.09), reduced vitamin content, reduced amino acid content and increased mineral contents in the group applied fungicide when compared to control. Conclusion: It could be concluded from the results obtained this study that the fungicide used, affected the nutritional and anti-nutrient composition of cocoyam.

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