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对不同麻龄、麻季、生育期的苎麻茎、叶 （全株叶、新定型叶） 等部位取样测定 Ｎ、 Ｐ、 Ｋ含量及其在各时期变化， 结果表明， 叶片中 Ｎ、 Ｐ含量多数时期都显著或极显著高于茎， 其 Ｋ含量与茎的差异较小； 茎与叶片之间的 Ｐ、 Ｋ含量， 全株叶与新定型叶之间的 Ｎ、 Ｐ、 Ｋ 含量都呈极显著正相关； 植株前期 Ｎ、 Ｐ含量较高，中后期 Ｋ 含量较高。封行期至黑脚期是营养吸收高峰期， 对产量影响很大。在封行期至黑脚期 （快速生长期）， 采集新定型叶对 Ｎ、 Ｐ、 Ｋ等营养元素含量进行一次性营养诊断和调节施肥较为适宜。
The contents of N, P and K in different ramets, ramie and ramie stems and leaves (whole plant leaves and newly planted leaves) of different age, seasons and growing period were sampled to determine the contents of N, P and K and their changes in different periods. The contents of P and K in stems and leaves, N, P, K contents of whole plant leaves and newly planted leaves all showed extremely significant or extremely significant difference Significantly positive correlation; early plant N, P content is higher, the higher K content in the late. The period from the closure to the black-legged period is the peak period of nutrient absorption, which has a great impact on output. In the period between the sealing stage and the black-legging stage (rapid growth stage), it is more appropriate to collect new setting leaves for one-time nutritional diagnosis of N, P, K and other nutrients.