Tropical lowland rice response to preceding crops, organic manures and nitrogen fertilizer

The effects of preceding crops, maize fodder (Zea mays), mungbean (Vigna radiata), green manure (Sesbania cannabina), farmyard manure (FYM) and fallow, on the response of wet season rice (Oryza sativa L.) to fertilizer N (0 to 150 kg N ha −1 ) and their residual effects on the succeding maize crop were investigated on an Andaqueptic Haplaquoll in the Philippines in 1984 and 1985. Mean rice grain yield without fertilizer N was maximum (4.5 t ha −1 ) after Sesbania and minimum (2.7 t ha −1 ) after maize fodder. Mean yields of unfertilized rice after FYM, fallow, and mungbean were intermediate, decreasing in that order (...)