热研2号柱花草生长动态

以热研2号柱花草Stylosanthes guianensis (Aublet) Swartz cv. Reyan No.2]为材料，研究不同生长阶段干物质产量、养分和营养成分变化。结果表明：地上部干物质呈“单峰”曲线，初花期最高为540.81 g/株；地上部苗期吸收的N、P、K较小，但干物质养分含量高；分枝期后吸收量增加，初花期后N、P出现负积累，整个生育期地上部对磷的吸收量最小；随热研2号柱花草生育期的延续，地上部粗蛋白含量降低，粗纤维含量升高，营养价值降低，初花期粗蛋白产量最大为54.78 g/株。

Growth Dynamics of Stylosanthes guianensis cv. Reyan No.2

The dry matter (DM) yield, mineral nutrients and nutrient components of Stylosanthes guianensis (Aublet) Swartz cv. Reyan No.2 at different growth stages were studied. The results showed that DM yield of the overground part was a single peak curve, and the peak value was 540.81 g/plant at early flower stage. The uptake quantity of N, P and K of the overground part was the lowest at seedling stage, whereas the contents of nutrients in the dry matter were the highest. The uptake quantity of N, P and K of the overground part increased rapidly after branching stage, until early flower stage after which N and K accumulation showed negative growth. As for nutrient components, the crude fiber content increased with growing time, but the crude protein (CP) content decreased , nutritive value deceased as well. The maximum CP yield was 54.78 g/plant at early flower stage.