The book Principles of Profitable Farming was written by author German Kali Works Here you can read free online of Principles of Profitable Farming book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is Principles of Profitable Farming a good or bad book?
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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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