种植密度和施氮水平对华南8号木薯产量形成的影响

在不同种植密度和施氮水平条件下探讨华南8号木薯干物质积累、分配的规律及其对产量形成的影响。结果表明，低密度低施氮水平处理的产量显著高于高密度高施氮水平处理；低密度低施氮水平处理的单条薯重显著高于高密度高施氮水平处理，并且交互作用显著；低密度和低施氮水平处理虽然前期干物质生产速率较低，但后期干物质生产速率及其向块根的分配比例明显高于高密度和高施氮水平。

Effects of Planting Density and Nitrogen Application on Yield Formation of Cassava SC8(Manihot utilissima pohl)

Cassava SC8 (Manihot utilissima Pohl) was planted under different planting densities and different nitrogen fertilizer application levels to observe its dry matter accumulation and distribution as well as its yield. The cassava produced significantly higher yield and single tuber weight under the low-density and low-N treatment than under the high-density and high N treatment, and had an obvious interaction in single tuber weight under these two treatments. The cassava was lower in dry matter production at the early stage under the low-density and low-N treatment but obviously higher at the late stage with an evidently higher proportion of dry matter allocated into the root tuber than under the high-density and high N treatment.