Comparative Effects of the Application of Prilled Urea and Urea Supergranules on Flooded Rice in Madagascar

Guido D Onofrio, Jacques Dupuy and Remi Gaudin

Journal of Agricultural Studies, 2018, vol. 6, issue 1, 218-233

Abstract: Applying urea supergranules to flooded rice (10 cm deep, 3 weeks after transplantation) is associated with yield increases of 17%, 23%, 22% and 16% (for doses of 27, 54, 81 and 108 units of nitrogen per hectare) compared with prilled urea. Nitrogen-15 can be used to establish the real nitrogen utilization coefficients for the aerial parts of the plant. While the figures are very low for prilled urea (between 4% and 9%), they exceed 25% and 38% for supergranules on the sites studied. The effect of fertilizer form is greater than the dosage factor. The results are discussed in terms of apparent utilization coefficients and mechanism used.

Keywords: Urea; Oryza sativa L.; deep placement (search for similar items in EconPapers)
Date: 2018
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