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Published in Crop Sci 20:110-112 (1980)
© 1980 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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A Low-Cost System for Circulating Nutrient Solutions in Pot Studies1

A. B. Guevarra, Y. Kitamura, A. S. Whitney and K. G. Cassman2

A simple, inexpensive nutrient solution circulation system was developed which could be duplicated in developing countries. The airlift perfusion principle was employed to continuously recirculate nutrient solution within individual pots containing porous medium. The system has proven to be very satisfactory for N studies including an 15N experiment and an evaluation of the transfer of legume-fixed N to a grass growing in a separate pot.

Key Words: Perfusion system • N transfer

1 Journal series no. 2269 of the Hawaii Agric. Exp. Stn. This work was supported in part by the U.S. Agency for International Development (Contract ta-C-1207), NifTAL Project, P.O. Box ‘O’, Paia, HI 96779.

2 Former assistant agronomist, former East-West Food Institute graduate intern, agronomist, and former graduate research assistant, respectively. Present address of senior author: Standard Fruit Company, P.O. Box 362, Commercial Post Office, Makati, Rizal D-708, Philippines.

Received for publication June 26, 1978.




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