na INLIS000000000003644 0010-0121002010 Improvecement of Efficiency and Environmental Impact of Nitrogen Fertilizers in Irrigated Rice Cropping in South EAST Asia : final Technical Report FAO Jakarta FAO 1999 132p, ill, 30 cm 633.18.184 633.18.184 IRRIGATED RICE NITROGEN FERTILIZERS ENVIRONMENTAL IMPACT SOUTHEAST ASIA. 4896 4896