Interaction Between Calcium Level and Nitrogen Source on Growth and 45ca Distribution In Subterranean Clover

Abstract

Using either ammonium or nitrate as the nitrogen sources, dry matter yields were highest from plants grown on a normal calcium nutrition, whereas plants supplied with urea grew best at low calcium level. When ammonium and nitrate were added together, yields were independent of the calcium concentration in the substrate. Plants fed solely ammonium nitrogen made extremely poor growth.