Grisana Linwattana และ Vriendra Pal Singh; Joveno S. Lales. (2002) Suitable Splitting Proportions and Timing of N Fertilizer Application in Direct-seeded Rice. <i>Thai Agricultural Research Journal</i>, <i>20</i>(1), 32-44.Grisana Linwattana และ Vriendra Pal Singh; Joveno S. Lales. "Suitable Splitting Proportions and Timing of N Fertilizer Application in Direct-seeded Rice". Thai Agricultural Research Journal 20 (2002):32-44.Grisana Linwattana และ Vriendra Pal Singh; Joveno S. Lales. Suitable Splitting Proportions and Timing of N Fertilizer Application in Direct-seeded Rice. Department of Agriculture:ม.ป.ท. 2002.