Agronomy Journal Journal of Natural Resources and Life Sciences Education
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Published online 1 September 1969
Published in Agron J 61:681-683 (1969)
© 1969 American Society of Agronomy
677 S. Segoe Rd., Madison, WI 53711 USA
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Effect of the Preceding Crop and Agronomic Practice on Sorghum (Sorghum bicolor L. Moench) and Groundnuts (Arachis hypogaea L.) in the Central Sudan1

P. A. Gerakis and C. Z. Tsangarakis2

The influence of sorghum (Sorghum bicolor L. Moench), sesame (Sesamum indicum L.) and groundnuts (Arachis hypogaea L.) unfertilized and fertilized with N and P and of bare and weed fallow on the subsequent season's performance of sorghum and groundnuts was studied in 2-year trials. The fertilizer rates of 50 kg/ha of N and 22 kg/ha of P applied to the first season's crops affected the yield of the second season's sorghum but not of groundnuts. Two consecutive years of sorghum or groundnuts was deleterious to the second season's yield. Symbiotic fixation in groundnuts was apparently low due to soil acidity and the absence of recent groundnut cultivation. Bare fallow increased moisture by 7.4 mm in the top 1.0 m of soil as compared to weed fallow, but the increase was not reflected in the yield of either crop.

Key Words: Acacia senegal zone • Bare fallow • Rotation • Symbiotic fixation

1 Paper based on investigations carried out as part of the U.N.S.F. "Land Use and Rural Water Development Research Project for Kordofan> in 1962–1965, supervised by F.A.O. and the Sudan Government and contracted by Doxiadis Associates Int. Ltd. of Athens, Greece.

2 Agronomist, 20 Vasilissis Sophias St., Thessaloniki, Greece, and Agronomist, Agricultural Research Service, Ministry of Agriculture, Athens, Greece.

Received for publication January 30, 1969.




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Copyright © 1969 by the American Society of Agronomy.