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Asian Journal of Plant Sciences
Year: 2019  |  Volume: 18  |  Issue: 4  |  Page No.: 175 - 180

Effect of Nitrogen Fertilizer Source, Soil Type and Season on Growth Performance of Two Sorghum Cultivars

Erick Sebetha and Solofelang Modisapudi    

Abstract: 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.

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