Chapter 24

Nature of experiments on crops and manures 561 Soil of Rothamsted 561 Table I. List of Rothamsted field experiments 562 Wheat experiments-- Unmanured plots 562 Wheat grown continuously on same land (unmanured) 562 Table II. Results of first eight years 562 Table III. Results of subsequent forty years 562 Table IV. Wheat grown continuously with farmyard manure (14 tons per annum) 564

Table V. Wheat grown continuously with artificial manures 565 Table VI. Experiments on the growth of barley, forty years, 1852-91 566 Table VII. Experiments on the growth of oats, 1869-78 567 Table VIII. Experiments on root crops--Swedish turnips 568, 569 Table IX. Experiments on mangel-wurzel 568, 569 Table X. Experiments with different manures on permanent meadow-land, thirty-six years, 1856-91 570 Table XI. Experiments on the growth of potatoes--average for five seasons, 1876-80 571 Table XII. Experiments on growth of potatoes (continued)-- average for twelve seasons, 1881-92 572

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INDEX 573