Artificial manures; their chemical selection and scientific application to agriculture . thepotatoes which have received the same treatment. The following figures are instructive :— CROP OF GRAPES. Per acre grapes IMiist Plot with uormal mauure . 4 tous 15 cwts. 848 gallonsPlot without potash . 0 ,, 0 ,, Since I first began my experiments on plant growth I have metwith nothing to be compared with this result, whether we considerthe definiteness of the conclusions to be drawn from or the absoluteexactitude of their indications. Theoretical Expeuiments on the Growth op Plants in Cal-cined Sand,
Artificial manures; their chemical selection and scientific application to agriculture . thepotatoes which have received the same treatment. The following figures are instructive :— CROP OF GRAPES. Per acre grapes IMiist Plot with uormal mauure . 4 tous 15 cwts. 848 gallonsPlot without potash . 0 ,, 0 ,, Since I first began my experiments on plant growth I have metwith nothing to be compared with this result, whether we considerthe definiteness of the conclusions to be drawn from or the absoluteexactitude of their indications. Theoretical Expeuiments on the Growth op Plants in Cal-cined Sand, the teachings op which have been conpirmedBY Practical Results. Soda cannot replace potash as a fertilising agent. For many years past English agriculturists have consumed animmense and constantly increasing quantity of sodic nitrate, im-ported from Peru. This salt, the good effects of which have beenabundantly confirmed by practice, was first brought into noticeby the researches of M. Kuhlmann, i by the more theoretical ^Experiences Chimiques et Aqronomes, * SERIES OF ]. ^ ^ n W] 1 epre sent the g enera la\ ACTION OF FERTILISING AGENTS 339 luxuriantly cjreen, but those in the plot which has received nopotash, and in that which has received no manure at all, a numberof copper-coloured spots begin to make their appearance, and shortlyafterwards begin to spread very rapidly, gradually extendingthemselves over the whole of the foliage, and drying up the plantas if a burning wind had passed over it. As for the potatoesthemselves they are hardly larger than walnuts, have a peculiarlydisagreeable smell, and do not keep well. With the normal manure the crop is from 8 tons to 10 tons16 cwts. per acre, but by suppressing the potash it falls to 2 tons16 cwts. Until lately I always thought that the leguminoste and thepotato were the plants which showed a special preference for potash,but the vine distances them in this respect in a most surprisingmanner. In the case of the potato
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