Abstract
The response of plant dry matter to addition of a low grade Brazillian (Patos) phosphate rock was increased by mycorrhizal inoculation (strain E3) ofStylosanthes guianensis andDesmodium intortum, but less so by inoculation ofCenchrus ciliaris andPaspalum plicatulum. The effect was related partly to the extent of root development. In the presence of a nitrification inhibitor the utilisation of Potos rock phosphate by Paspalum was higher with NH4+-N than with NO3-N. This effect was attributed to acidification which in turn was related to the organic anion content of the plants. The results indicate the potential for improving the utilization of the low grade phosphate rock on an acid oxisol by mycorrhizal inoculation of herbage legumes and by soil acidification when growing grasses.
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