Response of rice to fertilizer and fertilizer treated green manure in saline soil   Somsri Arunin Pirach Pongwichian Pannee Rungsaengchan Arunee Yuvaniyama and Chaiyanam Dissataporn   ABSTRACT         The study on use of Sesbania rostrata as green manure with fertilzer to increase rice yield was carried out both in saline and non saline soil where the soil are low fertility during 1989 to 1993. Four levels of amendment (control, PKS, PKS + dolomite lime and PKS + dolomite lime + FYM) and four levels of fertilizer (control, N, NPKS and NPKS + FYM) were studied under 4 x 4 factorial in RCBD. Five years of experiment showed that S. rostrata required nutrients to produce sufficient biomass in infertile soil. Moreover, N content of S. rostrata in non saline soil was higher than that of in saline site of 2.657 and 1.606 % N, respectively. S. rostrata as green manure and with additional fertilizer on rice increased rice yield 58 % over control treatment in non saline but not in saline soil. After five years, soil electrical conductivity decreased. Soil fertility depended on biomass which incorporated. While the effect of soil amendment on change soil properties was not evident.         Keywords : Sesbania rostrata, fertilizer, rice, saline soil