A modelling experiment was conducted to study the silica supply-ing ability of paddy soil reclaimated from red earth. When arable red earth was flooded to plant rice crop, soil available silica varied with previous cropping systems. In order of decreasing silica they were winter rap crop, Winter green manure and winter flooding. During the early stage of rice plant growth, soil available silica increased greatly and peaked during the late tillering stage.Howe-vet, it decreased significantly from the booting stage to the initial panicle stage and the decrease continued slowly after that stage u...
