头发主要由蛋白质组成，是诊断营养缺乏非常有用的指标。

Hair, which is made up mostly of protein, serves as a useful diagnostic marker for nutritional deficiencies.

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通过水培试验，研究三七在缺素营养溶液中的生长状况，为三七营养元素缺乏的田间快速诊断提供参考。

The growth and development of Sanqi in the lack of nutritional elements had been done by the water culture.

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矢量法营养诊断结果表明：未施肥的杨树各组织N、P、K均为缺乏状态，N、P、K是杨树生长的限制性因素。

It is showed from vector analysis: N, P and K are deficient in poplar unfertilized and they are limiting factors to poplar.

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