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Many long-grain rice varieties have been introduced in the tropics, including Rwanda. However, farmers prefer the local varieties to these new ones. The aim of this study was to evaluate how the new rice varieties respond to different nitrogen levels, determine the best nitrogen rate and location for enhancing rice grain yield, and assess the economic viability of nitrogen fertilizer rates and their effective application. Five nitrogen levels (0, 40, 80, 120 and 160 kg N ha−1) and two methods of nitrogen application (broadcast and deep placement) were tested on two rice varieties (WAB 880-1-38-20-28-P1-HB and IR 28). The optimum fertilizer nitrogen rates were 106 and 98 kg N ha−1 for WAB 880-1-38-20-28-P1-HB and IR 28, respectively. There was no significant difference in rice grain yield between the two methods of placement; the maximum rice grain yield was obtained at 120 kg N ha−1 for both varieties. The recommended fertilizer nitrogen rates were 106 and 98 kg ha−1 for WAB and IR28 varieties, respectively.

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Enhancing Soil Nitrogen Management for Lowland Rice Production in Sub-Saharan Africa

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  • 出版模式：

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  • 发表日期：

    2026年

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  • Twaha Ali Basamba,
  • Boshwenda Chuma Andre,
  • Mambani Banda Pierre,
  • Ann Tumushabe,
  • Kassim Ssekabira

摘要

Many long-grain rice varieties have been introduced in the tropics, including Rwanda. However, farmers prefer the local varieties to these new ones. The aim of this study was to evaluate how the new rice varieties respond to different nitrogen levels, determine the best nitrogen rate and location for enhancing rice grain yield, and assess the economic viability of nitrogen fertilizer rates and their effective application. Five nitrogen levels (0, 40, 80, 120 and 160 kg N ha−1) and two methods of nitrogen application (broadcast and deep placement) were tested on two rice varieties (WAB 880-1-38-20-28-P1-HB and IR 28). The optimum fertilizer nitrogen rates were 106 and 98 kg N ha−1 for WAB 880-1-38-20-28-P1-HB and IR 28, respectively. There was no significant difference in rice grain yield between the two methods of placement; the maximum rice grain yield was obtained at 120 kg N ha−1 for both varieties. The recommended fertilizer nitrogen rates were 106 and 98 kg ha−1 for WAB and IR28 varieties, respectively.