| Two methods of nitrogen management of broadcast wet-seeded rice in SPR1 with Leaf Color Chart (LCC) had been demonstrated compared with farmer fertilizer's practice in 6 farmer fields in Suphan Buri province during dry and wet season, 2003. The results showed that LCC produced yield of 605 and 616 kg/rai whereas farmers’ practice produced only 594 kg/rai and also consumed 28-48% less N fertilizer and gained more yield per nitrogen unit than those of farmers’ practice. Moreover, LCC took only 3.80 baht/kg of total fertilizer input cost and gained 602-614 baht of net benefit whereas the farmers’ practice needed 4.20 baht/kg and gave only 363.50 baht net benefit. Thus, nitrogen management with LCC reduces a lot of input cost and imported urea fertilizer. |
