Publisher's Synopsis
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, Cirencester
Referring first to the results on the four plots without nitrogenous manure, as given in the first column of the Table, it is seen that plot 2, with superphosphate of lime, and plot 4, with superphosphate and salts Of potash, soda and magnesia, give considerably more produce than plot 3, with the potash, soda, and magnesia, without phosphate. There is more of straw, as well as grain, and of course, therefore, of total produce, with than without the phosphate. There is, indeed, very marked effect by phosphatic manure, and very little by the alkalies.
The second column, with the same four conditions as to mineral supply, but with, in each case, 43 lbs. Of nitrogen per acre per annum as ammonium salts, shows a very great increase. Even with the ammonium salts alone there is a great increase; there is somewhat more on plot 3, where the alkalies are also applied, but very much more still on plots 2 and 4, Where phosphates are also used.
The third column Shows that with a larger amount of nitrogen supplied in the first six years, and with nitrate of soda instead of ammonium salts in the later years, there is still greater increase; and again, the increase is by far the greater where the superphosphate is used.
The 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.
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