The Nitrogen-Nutrition of Hippophae rhamnoides L.

It is shown that Hippophaë plants, inoculated at the six-leafstage with a suspension of crushed nodules, begin to developnodules in about two weeks and soon afterwards become able togrow satisfactorily in culture solution free of combined nitrogen,up to 79 mg. nitrogen per plant having been accumulated during7 months' active growth. It is concluded that the nodules fixatmospheric nitrogen, and that in its nitrogen nutrition theHippophaë plant shows a close similarity to the nodulatedlegume. It is pointed out that Hippophaë and the otherAngiospermous genera with nitrogen-fixing root nodules are allwoody plants or belong to a family which includes woody types.The possible significance of this is briefly discussed.