File:Agricultural investigations at Rothamsted, England, during a period of fifty years. Six lectures delivered under the provisions of the Lawes Agricultural Trust (1895) (14595205397).jpg

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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ntents.Another series was therefore commenced in 1890, and is still in progress,in which the same four annuals, peas, beans, vetches, and yellow lupines,and the same four plants of longer life, white clover, red clover, sain-foin, and lucern. were growu in specially made pits, so arranged thatsome of the plants of each description could be taken up and theirroots and nodules studied at successive periods of growth: The annualsat three periods, namely, first, when active vegetation was well estab-lished; secondly, when it was supposed that the point of maximumaccumulation had been approximately reached: and thirdly, whennearly ripe: and the plants of longer life at four periods, namely, atthe end of the first year, and in the second year, when active vegeta-tion was reestablished, when the point of maximum accumulation hadbeen reached, and lastly, when the seed was nearly ripe. Each of theeight descriptions of plant was grown in sand (with the plant ash), FIXATION OF FREE NITROGEN. 137
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In sand. Sopt. 24. In soil, Sept. 26. In sand. Nov. 20. In soil, Dec. 2. Fh;. 4.—Peas grown in experiments on the fixation of free nitrogen. 1890. watered with the extract from a rich soil; also in a mixture of twoparts rich garden soil and one part of sand. The pits, with theirplants, were exposed to the open air, bnt protected from heavy rain. 138 AGRICULTURAL INVESTIGATIONS AT ROTHAMSTED. In the sand the infection was comparatively local and limited, butsome of the nodules developed to a great size on the roots of the weakplants so grown. In the rich soil the infection was much more generalover the whole area of the roots, the nodules were much more num-erous, but generally very much smaller. Eventually the nodules were

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