Identifier: agriculturalinve22gilb (find matches)
Title: Agricultural investigations at Rothamsted, England, during a period of fifty years. Six lectures delivered under the provisions of the Lawes Agricultural Trust
Year: 1895 (1890s)
Authors: Gilbert, Joseph Henry, 1817-1901 Lawes Agricultural Trust Association of American Agricultural Colleges and Experiment Stations
Subjects: Agriculture, Experimentation.
Publisher: Washington, Govt. Print. Off.
Contributing Library: U.S. Department of Agriculture, National Agricultural Library
Digitizing Sponsor: U.S. Department of Agriculture, National Agricultural Library

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courses, tenth and eleventh, for which potash, soda, andmagnesia were used as well as superphosphate. But, for the legumi-nous crops, the averages are, for reasons that will be explained, takendifferently. ROTATION OF CROPS. 177 Mixed mineral und nitrogenous manure. Hoots fed. II 1 22- 5? $ 2-2 cY©= 1 2£MQ0 2£3 2 S 1 1 22-- r 1 8? o S? _:!•--• 1 2 = 2 -2 2.23 2 3 1 1 11 ■s2 8 _ _. _ * s £^ 8? §2 22^=° 2SS 2 3 i 8 x X L-ri 1? 9 2? 1 33 CO 00 3 1 11 a 5a 1 I !3 ** 8 2222 — 2 2 co co - I35 8 §f £ £22 22 1 11 IS 8 gag » 5 S*3f 2- 1 00 CS OS 0C o i-l o o o OHO HH i ft -s2 8 3* S a 2 22 r 1 P Eoots fed. i 8 200 j? s S? J oof 1 1 8 0*00 „ Sf g- i-l r-t O O i«HH rH *H i-l © © © o © © © o o 11 ii 8 ass S? * 1 * j ^28^ » f 2 I r HNOO ■ CM i-i ;H o o i-i o © jj o o o o © © © o o i i 1 I i Is j j j j i i 5 III • I■ 1 : :: : Ft 11 ; j j : : ii : : i : ii i liiiii II vm < < i iiiiiiii ii 7539—No. 22 12 178 AGRICULTURAL INVESTIGATIONS AT ROTHAMSTED. *•
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ROTATION OF CROPS. 179 The first point to notice in the results is that, under each conditionas to manuring, there is very great variation in the amount of producefrom year to year, according to the seasons. Thus, in 1868, the cropentirely failed on all the plats, although seed was sown twice. Again,whilst the complex manure containing nitrogen yielded more than 22tons of roots in 18S0, the same manure gave little more than 4 tons in18G0; the average yield over the eight courses being about 13J tons.Against this, the average by superphosphate alone ranged from about(U to about 7t) tons, whilst without manure there was an average ofonly about 1 ton. Referring to this last result, it is particularly to be observed thatthis assumed restorative crop yields practically no produce at all whengrown without manure. The plat with superphosphate alone gives very much more than thatwithout manure, but still very much less than an average agriculturalcrop. The increase, such as it was, was largel

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