Strategy of nitrogen fertilizer application to increase growth and yield of rice in ratoon system at tidal swampland

This study aims to determine the effect of regulating the provision of nitrogen fertilizer on several rice varieties on the growth and yield of rice in ratoon system at the Tidal swampland. A split plot design was employed in this experiment. The main plot was nitrogen fertilizer application (N) consisting of N1, N2, N3, and N4. The subplot is rice varieties (V) consisting of Inpari 30 (V1), Inpara 3 (V2), Inpari 33 (V3), Inpari 43 (V4) and Hipa 5 Ceva (V5). The results showed that ½ dose nitrogen fertilization given at planting + ½ dose at primordia had a good effect on the growth and yield of the main crop, whereas 1/3 dose nitrogen fertilization given at planting + 1⁄3 dose at primordia + 1⁄3 dose at harvest tends to have a good effect on ratoon yield. Variety Hipa 5 Cevaproduced highest yield of unhusked rice (i.e. 4.9 tons ha -1 for the main crop and 2.71 tons ha-1 for ratoon) at (N3): 135 kg N ha -1 fertilizer, when ½ dose was given at planting + ½ dose at primordia. The variety Hipa 5 Ceva with various nitrogen fertilization strategies provided the highest total grain yield in the ratoon system at tidal swampland.