Nodulation, nitrogen fixation and the need for inoculation of Vigna spp. in subtropical Australia

Nodulation, nitrogen fixation and the need for inoculation of Vigna spp. in subtropical Australia

Shanhua, Tainan AVRDC Taiwan

1988

p.418-426

SB205.M8A5 1987

Although legumes belonging to the genus Vigna, including black gram (Vigna mungo) and mungbean, (V. radiata) are considered to be promiscuous and will freely nodulate with bradyrhizobia from a wide range of legumes, responses to inouclation may be obtained even when sown into land previously cropped to these legumes. The causes of poor nodulation may be low numbers of indigenous strains of Bradyrhizobium, or poor multiplication and survival of inoculem strains in the rhizosphere of particular genotypes in particular soils. Large host x strain interactions for nitrogen fixaiton were obtained when black gram, mungbean or adzuki bean (V. angularis) were grown in Leonard jars, with some of the least effective strains originating from legumes of the same genus and even the same species. It is, therefore, recommended that inoculation be practiced when black gram or mungbean are sown into newly-cultivated land. In general, however, it should not be necessary to inouclate where Vigna sp. crops have been grown previously for a number of years, although to avoid nodulation failures, it is advisable that some trials to determine the need to inoculate be conducted on a regional or soil-type basis. [AS]

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