Effects of nitrogen fertilizer levels and planting density on growth and yield of long grain rice
Munnujan Khanam; Hamid, A.; Hashem, A.; Hirota, O.
Bulletin of the Institute of Tropical Agriculture, Kyushu University 24: 1-10
ISSN/ISBN: 0915-499X Accession: 003743551
A field experiment was conducted in Gazipur, Bangladesh, in 1993 to determine the effects of nitrogen (N) fertilizer and planting density on growth and yield of long grain rice. The treatments consisted of 4 levels of N fertilizer (0, 40, 80 and 160 kg N ha-1) application at three levels each of planting density (20, 40 and 80 hills m-2). Dry matter (DM) per hill increased almost linearly with the increase in N level; but its effect was more conspicuous before than after the heading stage. The increase in planting density generally made plant size too small. Tillers per plant increased linearly with the increase in N fertilizer levels. Grain yield and most of the yield attributes varied significantly. The highest grain yield (3804 kg/ha) obtained was at 160 kg N ha-1, which was similar to the yield obtained at 80 kg N ha-1 (3610 kg/ha).