Ureum as stikstofbron by die bemesting van vrugtebome

Van Niekerk, P. E. le R.(Pieter Eduard le Roux),1938- (1964)

Proefskrif (M. Sc.) -- Universiteit van Stellenbosch, 1964.

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Please refer to this item in SUNScholar by using the following persistent URL: http://hdl.handle.net/10019.1/54172
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