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Influence des propriétés du sol et de l'historique de la culture du soja sur la population de Bradyrhizobium japonicum dans des sols français
Author(s) -
REVELLIN C.,
PINOCHET X.,
BEAUCLAIR P.,
CATROUX G.
Publication year - 1996
Publication title -
european journal of soil science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.244
H-Index - 111
eISSN - 1365-2389
pISSN - 1351-0754
DOI - 10.1111/j.1365-2389.1996.tb01850.x
Subject(s) - bradyrhizobium japonicum , calcareous , soil water , agronomy , bradyrhizobium , population , inoculation , crop , biology , silt , horticulture , symbiosis , botany , bacteria , ecology , rhizobiaceae , rhizobium , genetics , demography , sociology , paleontology
Summary As French soils are naturally free of Bradyrhizobium japonicum , soya beans planted into new areas must be inoculated with this bacterium. Although, the B. japonicum inoculum can survive in soils for long periods of time even in the absence of a soya bean crop, re–inoculation may increase nodulation and grain yield. Thus, populations of B. japonicum can fall below optimum for plant growth. To identify the soil properties controlling survival of the inoculated bacteria samples of soil were collected from 52 sites from France that had previously grown soya beans. The samples were analysed for some physical and chemical characteristics and the B. japonicum population counted. The soil's CaCO 3 content was the main factor affecting survival. The average B. japonicum numbers (per g soil) were 80 for calcareous soils and 15000 for non–calcareous soils. In the latter, silt and sand contents were correlated with the numbers of B. japonicum. The cropping frequency of soya bean and the time since the crop was last grown were other factors affecting Bradyrhizobium populations. Thus, there is a probability of enhancing economic benefit for farmers with re–inoculation of soya bean in calcareous and sandy soils.