Abstract
Abstract Dry matter production and dinitrogen fixation characteristics in kudzu (Pueraria lobata Ohwi) and some tropical pasture legumes, centro (Centrosema pubescens) and siratro (Macroptilium atropurpureurn cv siratro) were studied under full sunlight and shaded conditions. Nodulating (T202) and nonnodulating (T201) soybean (Glycine max L. Merr.) isolines, were used as reference crops. The results obtained showed that: 1. Under full sunlight conditions, the whole plant weight at final harvest was in the following order: siratro > T202 ≧ kudzu > centro ≫ T201. However the root to shoot ratio was significantly higher in kudzu than in the other species, particularly at the later growth stages (105 d after planting). 2. Total plant N content and carbohydrate accumulation in the legumes followed the same order as that of the whole plant weight. Higher nitrogen (N) and starch accumulation were observed in kudzu roots at the later growth stages, with a simultaneous reduction in the shoot N amount, suggesting t...
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