Abstract
Field trials were conducted in the Philippines and India during 1989 and 1990 seasons to study comparative yield responses of transplanted rice (Oryza sativa L.) to pillow-shaped urea briquettes (UB) deep placed by an applicator (prototype developed by IFDC) and by hand immediately after transplanting. The applicator-placed UB consistently increased grain yields over the split-applied prilled urea, and the additional yields ranged from 0.23 to 1.48t ha−1 (5 to 83%) for 25 to 63 kg N ha−1. Agronomic responses of transplanted rice to the UB placed by the applicator and by hand were statistically equal. Modified rice hill spacing may be considered as a requirement for efficient use of the applicator. The results demonstrate that with the UB applicator it is possible to deep place UB mechanically and achieve the agronomic efficiency that is achieved by hand deep placement of the UB.
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References
International Fertilizer Development Center (IFDC) (1987) Small-scale briquetter for producing USG demonstrated. IFDC Report 12(4): 1–2
Kumar V, Shrotriya GC, and Kaore SV (eds) (1989) Urea supergranules for increasing nitrogen use efficiency, pp 1–143. IFFCO, New Delhi, India
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Savant NK and Stangel PJ (1990) Deep placement of urea supergranules in transplanted rice: Principles and practices. Fert Res 25: 1–83
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Savant, N.K., Ongkingco, P.S., Garcia, F.D. et al. Agronomic performance of urea briquette applicator in transplanted rice. Fertilizer Research 32, 139–142 (1992). https://doi.org/10.1007/BF01048775
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DOI: https://doi.org/10.1007/BF01048775