Abstract
AbstractCentrosema pubescens and Stylosanthes gracilis were grown on two soils of different texture adjusted to pH values ranging from 5–7 to 8–0 by the addition of either dilute sulphuric acid or calcium carbonate. Centrosema grew best on a soil having final pH values of 6–1, while Stylosanthes grew best on a soil having a final pH value of 5–7. Nodulation followed a similar trend with dry matter yields but was increasingly suppressed by increases in pH, with complete suppression in some cases at pH8. Maximum nitrogen fixation in both cases occurred at a pH value of about 6.
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