Effect of Endogone Mycorrhiza on Plant Growth

S ummary Varying amounts of soluble phosphate were applied over different periods during the growth of mycorrhizal maize. The amount of the endophyte produced within the root system and the growth of the host were related inversely. Repeated small doses of soluble phosphate over long periods depressed the production of the fungus more than when given over shorter periods. Large single applications of soluble phosphate applied early in the growth of the host also reduced the amount of the endophyte more than when given later. The role of mycorrhiza in relation to phosphate nutrition is discussed.