WHEN freshly collected cow-dung (containing 0.368 per cent nitrogen and 7.5 per cent carbon) is mixed with soil and exposed to sunlight daily for six hours in dishes, nitrogen fixation is observed.
MEYER and Anderson 1 recently found that moderately high temperatures inhibit symbiotic nitrogen fixation in subterranean clover grown in nutrient agar and they imply that their results may be ...
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