Phosphate response curves for mycorrhizal and non-mycorrhizal plants of 10 white clovers (Trifolium repensL.) were determined in glasshouse experiments. In contrast to the result of raising soil available phosphorus, the effects of mycorrhizas on plant growth were small and confined to the lowest soil phosphate treatments used. Mycorrhiza #xD7; clover type interactions were rare for any of the response parameters recorded and clover root morphology had little inftuence on mycotrophy, The results suggest that mycorrhizal relationships may not be important in a clover selection programme aimed at identifying plants that utilise soil phosphate efficiently.
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