The Gardeners' chronicle : a weekly illustrated journal of horticulture and allied subjects . dduced with reference tothe results and conclusions of others which haverecently been put forward. 1. The Evidence Relating to other Sources THAN Free their earlier papers the authors had concludedthat, except the small amount of combined nitrogencoming down in rain, and the minor aqueous depositsfrom the atmosphere, the source of the nitrogen ofour crops was, substantially, the stores within thesoil and subsoil, whether derived from previousaccumulations, or from recent supplies by manure
The Gardeners' chronicle : a weekly illustrated journal of horticulture and allied subjects . dduced with reference tothe results and conclusions of others which haverecently been put forward. 1. The Evidence Relating to other Sources THAN Free their earlier papers the authors had concludedthat, except the small amount of combined nitrogencoming down in rain, and the minor aqueous depositsfrom the atmosphere, the source of the nitrogen ofour crops was, substantially, the stores within thesoil and subsoil, whether derived from previousaccumulations, or from recent supplies by manure. More recently, it has been shown that the amountof nitrogen as nitric acid in the soil, was much lessafter the growth of a crop than under correspondingconditions without a crop. In the case of Gramin-aceous crops, it was concluded that most, if not thewhole, of their nitrogen was taken up as nitric , with Leguminous plants, the evidence indicatedthat, in some cases, the whole of the nitrogen hadbeen taken up as nitric acid, but that in others thatsource seemed to be Fia. 48.—OERMINATXON OF GINKGO ADIAXIIFOLII.(SEE P. 264.) examined, when it was found that the sap was verystrongly acid. But the manipulation in the laboratory not beingcomparable with those of the action of living rootson the soil, the results obtained did not justify anyvery definite conclusions as to whether the action ofthe roots on the soil, by virtue of their acid sap, isquantitatively an important source of the nitrogenof plants having an extended development of roots,of which the sap is strongly acid. Supposing, how-ever, this to be the case, the question still remains,whether the amide substance thus rendered solubleis taken up as such, or whether it undergoes furtherchanges before serving as food lor the plant ? Upon the whole it seems probable, that green-leaved plants can take up soluble nitrogenous organicbodies when these are presented to them under suchconditions as in water
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