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Articles by Erick Sebetha
Total Records ( 2 ) for Erick Sebetha
  Erick Sebetha and Solofelang Modisapudi
  Background and Objective: The growth performance of sorghum is influenced by soil structure of location and the source of nitrogen fertilizer applied during planting. Greenhouse experiment was conducted during spring and repeated in autumn of 2017 planting season, to investigate the influence of nitrogen fertilizer source, soil type and cultivar on the growth parameters of sorghum. Materials and Methods: The experiment was a 2×2×4 factorial experiment fitted into a complete randomised design. Two soil types used were loamy sandy and sandy soil. Two sorghum cultivars planted were PAN 8826 and PAN 8625 and 4 nitrogen fertilizer sources were ammonium sulphate, urea, LAN and control. The measured growth parameters were plant height, number of leaves per plant, leaf area, leaf chlorophyll content, stem diameter and root mass. Results: Nitrogen fertilizer source had significant effect (p<0.05) on leaf chlorophyll content, leaf area, stem diameter and fresh root mass. Sorghum fertilized with nitrogen fertilizer source, ammonium sulphate had significantly higher leaf chlorophyll content of 14.28 than other sources of nitrogen fertilizer. Sorghum fertilized with nitrogen fertilizer sources, ammonium sulphate, LAN and urea had significantly larger stem diameter of 1.07 cm than control. Planting season also had significant effect (p<0.05) on plant height and number of leaves/plant. Sorghum planted during spring had significantly taller plant height of 72.0 cm and higher number of leaves/plant of 6.5 than sorghum planted in autumn. Conclusion: In this study, nitrogen fertilizer irrespective of source responded positively in terms of stem diameter and leaf chlorophyll content. This study indicated that, sorghum should be planted in spring to obtain higher plant height and number of leaves/plant.
  Erick Sebetha
  Background and Objective: Cowpea production is affected by crop rotation and this indicates the N contribution in cereal-legume rotation. The study was conducted to investigate the effect of cropping system, location, planting season and nitrogen fertilization on cowpea stover yield, seed mass and soil pH. Materials and Methods: The study comprised of three cropping systems (Maize-cowpea rotation, monocropping cowpea and intercropped cowpea), three locations (Potchefstroom, Taung and Rustenburg) and two rates of nitrogen fertilizers applied in kg ha1 at each site (0 and 20 at Potchefstroom, 0 and 17 at Rustenburg, 0 and 23 at Taung). A factorial experiment randomized in complete block design with three replications was conducted during 2011/12 and 2012/13 planting seasons. The measured parameters were plant population at harvest, stover yield, seed mass and soil pH (KCl). Results: Cowpea harvested at Potchefstroom and Taung had significantly higher stover yield of 1319.4 and 1784.9 kg ha1, respectively than cowpea harvested at Rustenburg. Seeds harvested from intercropped system had significantly higher mass of 15.35 g than seeds harvested from mono-cropped and rotational systems. The interactions of location and planting season had significant effect on plant population and stover yield during harvesting. Soil collected at Taung had pH of 6.47 (slightly acidic) compared to soil collected at Potchefstroom and Rustenburg. Conclusion: Application of nitrogen fertilizer has no influence on the production of cowpea. Location with higher percentage of clay experienced reduction in soil pH.
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