Effect of <I>Sesbania rostata </I> as Green Manure on 4 Rice Varieties

Abstract

The study on Sesbania rostrata as green manure in rice-soybean system was carried out at Multiple Cropping Center Experiment Station, Faculty of Agriculture, Chiang Mai University from 1993 to 1996 on San Sai soil series with organic matter 1-1.27%, 70-120 ppm of P and 17-22 ppm of K. The result showed that all of the four varieties, namely RD6, RD7, Neaw Sanpatong and KDML 105 responsed to sesbania green manure of 50 days old incorporated 7 days before transplanting rice. The four-years average grain yields of the four varieties with sesbania green manure were 712,783, 750 and 677 kg/rai compared with control 633, 622,632 and 574 kg/rai, respectively. However, the soil organic matter content did not show any significant changes.