The effect of calcium and soil pH on nodulation of T. subterraneum L. clover on a yellow podsol

Abstract

The mechanism of the action of lime in stimulating nodulation of subterranean clover on some soils of the Southern Tablelands of New South Wales was studied in pot experiments. Increased soil pH or increased calcium supply alone did not markedly improve nodulation. With a combination of both these factors, excellent nodulation resulted. Nodulation was shown to be increased by increasing the amount of the inoculum of Rhizobium added with the seed. It was also increased if the moisture content of the soil was maintained continually at field capacity.