Journal And Proceedings of the Royal Society of New South Wales 41
Journal And Proceedings of the Royal Society of New South Wales 41
Royal Society of New South Wales
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Olay... ... 6-36 8^07 8^94 Loam ... o yy . 2-02 2^89 Sand... ... 1^69 •19 •26 64 F. B. OUTHBIB AND L. OOHEN. There are one or two points to be noted in these tables. In the first place the amount of mineral plant-food (phos- phoric acid and potash) soluble in water has suffered a very considerable decrease during the period of the experiment, notably the water-soluble phosphoric acid in all soils, and the potash in the clay soil. The action of liming has been in all cases to produce an increase... in the quantities of water-soluble plant-food over the unlimed, but it is only in the sandy soil where liming has had the effeqt of increasing the proportions of water- soluble phosphoric acid and potash above those originally present in the soil. There was no vegetation in the pots, and no drainage except through the walls of the pots, and the samples for analysis were taken by mixing the whole of the contents of the pots and not from the surface layer only. It would therefore appear that there is a steady loss of water-soluble plant-food during the period, either by percolation through the sides of the pot or by conversion into insoluble plant- food.
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