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Results of Experiments at Rothamsted, on the Growth of Barley, for More Than Thirty Years in Succession on the Same Land
J H Gilbert
Paperback. Forgotten Books 2016-12-06.
ISBN 9781334543265
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Förlagets beskrivning
Excerpt from Results of Experiments at Rothamsted, on the Growth of Barley, for More Than Thirty Years in Succession on the Same Land: Being a Lecture Delivered June 29, 1886, at the Royal Agricultural College, CirencesterThe four plots of Series 4, with the rape cake, show a much greater uniformity Of result with the different mineral manures. Still the two phosphate plots (2 and 4) give more produce than the two without phosphate. Referring to the produce of grain in illustration, it is seen that plots 1 and 3 without phosphate give considerably more produce than the same plots (1 and in either Series 2 with the ammonium salts, or in Series 3 with the nitrate Of soda. The explanation Of this is that the rape cake itself contains phosphates. On plots 2 and 4, on the other hand, where phosphates are added, there is nearly as much produce in Series 2 with the ammonium salts, and more in Series 3 with the nitrate, than in Series 4 with the rape cake.Thus, then, whilst there is evidence that the phosphate of the rape cake was effective when none was otherwise supplied, when it was so applied in addition there was more effect with the nitrate, with its more rapidly available nitrogen, than with the rape cake, with its greater actual amount Of nitrogen, but in a less rapidly available condition.Comparing the produce Of plot 2 with superphosphate without potash, with that Of plot 4 with superphosphate, and salts of potash, soda and magnesia in addition, it is remarkable that, both in Series 2 with the ammonium salts, and in Series 3 with nitrate Of soda, there is over the whole period of thirty-two years almost identically the same amount of barley grain without as with the potash. There is, however, rather more straw and total produce with than without the potash. Thus we have, with the ammonium salts, an average Of forty-five bushels without potash, and 44% bushels with potash; and with the nitrate of soda 47 bushels without, and 47 ~12 bushels with potash. Of straw, however, there is, with the ammonium salts, an average of lbs. Without, and with the potash 3 and on the nitrate plots lbs. Without, and lbs. With potash.It will afterwards be seen that where nitrogen and phosphoric acid were liberally supplied without potash, the available potash of the soil itself became deficient 3 though this deficiency was to the last scarcely at all manifested in the produce of grain. It is obvious, however, that with gradual reduction in the amount Of plant, the yield of grain must in time diminish.About the PublisherForgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.comThis book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works
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Results of Experiments at Rothamsted, on the Growth of Barley, for More Than Thirty Years in Succession on the Same Land
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