Abstract
The numbers of nodules developing on the roots ofT. subterraneum increased with increase in the supply of nitrate nitrogen in the nutrient up to 1000 µM per litre. When the copper is supplied at 0.01 µM per litre, the weight of nodules that can be excised falls continuously with increase in nitrate nitrogen. By contrast, when the levels of copper ranged from 0.1 to 5 µM per litre the weight of excisable nodules increased continuously both with increase in supply of copper and increase in supply of nitrate nitrogen. Increase in the supply of copper also increases the growth of the plant and the quantity of nitrogen fixed.
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