NGHIÊN CỨU ẢNH HƯỞNG MỨC BÓN PHÂN ĐẠM VÀ SỐ DẢNH CẤY ĐẾN NĂNG SUẤT MỘT SỐ GIỐNG LÚA JAPONICA

The experiment was conducted in the National Center for Plant and fertilizer Testing (NCPAFT) to research on influence of nitrogen fertilizer levels and plant density on grain yield of three ricejaponica varieties TB-j1, TB-j2 and TB-j3. Three plant densities (D1, D2 and D3 seedling/hill) and three fertilizer levels N:P:K (85-90-80, 100-90-80 and 115-90-80 kg/ha) were selected for this study. Plant density and levels of N significantly influenced on yield of varieties studied. Grain yield was highest in TB-j3 (7.3 t/ha) followed by TB-j2 (6.65 t/ha) and TB-j1 (6.64 t/ha) with plant density D3 (three seedling/hill) and level of fertilizer (100-90-80 kg/ha) N:P:K.