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Rotation experiments with cotton in the Sudan Gezira

Published online by Cambridge University Press:  27 March 2009

F. Crowther  and
W. G. Cochran
F. Crowther
Affiliation:
Plant Physiology Section, Agricultural Research Institute, Anglo-Egyptian Sudan
W. G. Cochran
Affiliation:
Statistical Laboratory, Iowa State College, Ames, Iowa
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Extract

Rotation of crops is based in most countries upon the accumulated experience of past years; experiments testing the relative merits of various rotations are rarely resorted to unless some serious disturbance arises, such as the inclusion of a new crop. But in the Sudan Gezira (lat. 14–15° N., long. 33–34° E.) the need for rotation experiments was urgent, since growing cotton by artificial irrigation was a recent introduction, and, moreover, the soil was known to be intractable. Any improvement in rotation which would allay seasonal fluctuation in yield and raise the general level would greatly add t o the prosperity of the area.

Thus when the Gezira Research Farm was inaugurated in 1918 some unreplicated plots of various two-course rotations, and of continuous cotton, were laid down. These were supplemented in 1925–6 by a replicated trial comparing various three-course rotations, designed by E. M. Crowther of Rothamsted. Later, in 1931–2, a new ‘Combined Rotation’ experiment, designed by M. A. Bailey and E. M. Crowther, was added, and this comprised comparisons of one-, two-, three- and four-course rotations. These last

Type
Research Article
Information
The Journal of Agricultural Science , Volume 32 , Issue 4 , October 1942 , pp. 390 - 405
Copyright
Copyright © Cambridge University Press 1942

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References

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