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通过对木薯华南２０５ 的营养诊断分析，结果表明，在限定区间内，鲜薯产量随植后４ 个月的最年青展开叶的全氮全磷全钾含量的提高而增产，并达极显著。在一定的氮磷钾肥施用量内，叶片的全氮全磷全钾含量随施肥量增加而相应提高，并达显著或极显著。根据施肥对叶全氮磷钾含量进而对鲜薯产量的影响，得出华南２０５ 的营养临界指标为：最年青展开叶的全氮４ ．１ ％ 、全磷０．８４ ％ 和全钾１ ．０％ 。
The results of nutritional diagnosis of camptothecin in South China 205 showed that within a limited interval, the yield of fresh potato increased with the increase of the total phosphorus content in the youngest leaf of 4 months after planting, and the yield was very significant. Within a certain application rate of N, P and K, the content of total N-P and K in leaves increased with the increase of fertilizer application, and reached significant or extremely significant. According to fertilization on the total nitrogen, phosphorus and potassium content of leaves and the impact on the yield of fresh potatoes, we conclude that the critical nutrition index of South China 205 is: the nitrogen content of the youngest developing leaf.4. 1%, total phosphorus 0.84% and total potassium 1. 0%.