1Received for publication July 7, 1979.
The cost of publishing this paper was defrayed in part by the payment of page charges. Under postal regulations, this paper must therefore be hereby marked advertisement solely to indicate this fact.
2Professor of Soil Science, Senior Soil Chemist and Graduate Student, respectively.
3This research was supported in part by the Ministry of Agriculture of Israel and by the Histadruth. The help of the workers in the pecan plantation in Shoval is gratefully acknowledged.
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