Principles of Profitable Farming

Cover Principles of Profitable Farming
Principles of Profitable Farming
German Kali Works
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Three series of combinations of the principal plant foods are now under way at this Experiment Farm. One series is devoted to the study of the effect of potash; the second to the effect of nitrogen; the third to the effect of phosphoric acid. In each series the quantities range from a small amount of fertilizer to what may be considered an excess. In the four illustrations on the pages following the effect of fertilizers on sweet potatoes in some of the experimental plots is illustrated. In the... first illustration is shown the actual yield obtained from one plot which received no fertilizer (the plots in this series contain ^ of an acre each). The yield calculated to an acre was 30 EXPERIMENT FARM AT SOUTHERN PINES. N. C. 45 u fc 1 46 EXPERIMENT FARM AT SOUTHERN PINES, N. C. Is EXPERIMENT FARM AT SOUTHERN PINES, N. C. 47 'A U - w in N B S Is 5 48 EXPERIMENT FARM AT SOUTHERN PINES, N. C. 81 a. O 2 H EXPERIMENT FARM AT SOUTHERN PINES, N. C. 49 bushels. The next illustration shows results from a plot to which phosphoric acid and nitrogen were applied.

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