E. G. Hallsworth

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Cobalt has been shown to have a beneficial effect on the growth ofT. subterraneum, whether the plants are nodulated or not, and which is largely independent of the effectiveness of the rhizobial symbiont used. With effectively nodulated plants, an increase in the supply of combined nitrogen reduced both the nodulation (in grams per gram of root) and the(More)
The maximum radius of the rosette, defined as the distance from the centre shoot to the base of the leaf furthest from it, is highly correlated with yield of dry matter (r=0.98 to 0.93) over the earlier vegetative period, but becomes progressively less sensitive on approaching inflorescence. The maximum radius was tested for fidelity as a rapid index of(More)
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(More)
A study has been made of the effect of varying levels of copper supply on the soluble amino acids, carboxylic acids and sugars of subterranean clover (var. Mt. Barker). The effect in all cases varies with the supply of combined nitrogen. Although plants receiving nitrate nitrogen showed the usual accumulation of amino acids where copper was deficient, those(More)
Effects of copper deficiency on the development of subterranean clover root nodules were studied. These included a depression of the bacteroid content, an accumulation of starch in the invaded cells and a reduction in the rate of development of the nodule apex. A similar pattern of increasing severity of metabolic effects in the youngest tissues was also(More)
The effect has been studied of varying levels of copper supply on the copper, iron and manganese contents of plants ofT. subterraneum in which the growth rate had been altered by variation in nitrate supply and light intensity. It has been found that the copper content of the plants is related logarithmically to the level of copper in the nutrient and is(More)
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