. Australian Garden and Field. 310 THE GARDEN AND FIELD. December, The Causes of Infertility. The following extract is from the Presidential Address delivered by F. B. Guthrie before the Agricultural Section of the Australasian Associa- tion for the Advancement of Science, Melbourne, 1 <11 3 :— In all these cases we have toxic conditions which are quite distinct from the infertile condition brought about by soil-exhaustion, conditions which are not dependent upon the richness or poverty of the soil, and which no amount of manuring in the ordinary sense will remedy. Indeed, when we consider
. Australian Garden and Field. 310 THE GARDEN AND FIELD. December, The Causes of Infertility. The following extract is from the Presidential Address delivered by F. B. Guthrie before the Agricultural Section of the Australasian Associa- tion for the Advancement of Science, Melbourne, 1 <11 3 :— In all these cases we have toxic conditions which are quite distinct from the infertile condition brought about by soil-exhaustion, conditions which are not dependent upon the richness or poverty of the soil, and which no amount of manuring in the ordinary sense will remedy. Indeed, when we consider the large stores of plant food in average and even in poor soils, the comparatively small proportion removed by even the most exhausting crop, and the fact that this store of plant food is being con- stantly rendered available, it becomes difficult to realize that a few years' cropping can effect such a complete removal of plant food as we must assume to take place if the soil is ex- hausted in the manner usually recog- nised. As a matter of fact analyses of European soils go to show that under continuous cultivation there is little or no differences in the mineral con- tent of the soil. In short, the in- ferior crop-producing power of a soil after repeated cropping is due to The Hoover Potato Digger READY FOR THE Whv continue digging with forks when you can secure the Hoover ^lathine which will not only .save labor and aching backs but Dig vour Potatoes without damage ? Call earlv and inspect, or write us for further particulars. Norman & Co., ]'..\.\K STklCI'/r, ADKLAIDF,, SOLE IMPORTERS. other and more obscure causes than the simple depletion of the soil in plant food. It is open to doubt whether such a thing exists as an infertile soil, that is one which will not give satis- factory results under proper treat- ment. Plants, we know, can be grown in ignited sand or distilled water if the proper nourishment is supplied. The barren regions of the earth are all ca
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