Abstract: The characteristics of dry matter production of rice grown on the natural waters with that of rice grown in the paddy field were investigated. The results showed that: (1) the yield of rice grown on waters increasedby 12 percent compared with that in paddy fields; (2) the total dry matter production was similar with that of paddy rice at the early stage, while higher at the middle and later stage, the percentage of dry matter accumulated after tillering increased by 3.4 percent points; (3) the dry matter of green leaves was similar with that of paddy rice at the early stage, and increased by 30 percent at the middle and late stage; (4) the dry matter of stem and sheath was higher than that of paddy rice at the early and middle stage, but lower at the later stage. The contribution of stem and sheath to the yield was less than that of paddy rice.

Key words: dry matter, floating bed, natural waters, soilless culture

摘要： 利用浮床无土栽培技术在自然水域种植杂交水稻，水上稻的产量比同期种植的水田稻增产12%左右。其本田生育前期总干物质积累量与水田稻基本接近，中、后期则明显高于水田稻，抽穗以后的总干物质积累量占总干物质积累量百分比较水田稻提高了3.4个百分点。水上稻绿叶干物质积累量在前期与水田稻基本接近，中、后期则一直保持比水田高30%左右的优势。茎鞘的干物质积累则呈现前、中期比水田稻低，但后期却反而高于水田稻的变化趋势，茎鞘的干物质输出率比水田稻低，对产量的贡献不如水田稻。

关键词: 浮床, 无土栽培, 自然水域