The development of endomycorrhizal root systems ii. effect of agronomic factors and soil conditions on the development of vesicular‐arbuscular mycorrhizal infection in barley and on the endophyte spore density
1979
Black, R. | Tinker, P. B.
The percentage of roots with vesicular‐arbuscular mycorrhizal fungi and numbers of spores were measured over 2 years in a field experiment with different crop rotations of barley, kale and fallow. Spore numbers, and subsequent infections of barley crops, were largest following barley; both kale and fallow breaks reduced spore population and infection similarly. With all crop rotations there was a long delay before appreciable percentage infection of roots developed, followed by a rapid increase, and then a constant value. Such late infections appear unlikely to improve crop nutrition, and final yield was negatively related to per cent infection. A survey of barley crops in 2 years on commercial fields following at least 3 years barley showed that infection was rather similar in most fields. There was a very slight correlation between infection percentage, clay content and pH, but no other soil factor had any influence. Early‐sown crops tended to have low infection.
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