A solution culture (in which an extended soil solution, separated from, but in equilibrium with, the soil) was used for growing pasture plants under controlled conditions of constant P in the range 0.2-5μMol P /litre. Plant responses to P over the whole growth period, as indicated by Michaelis-Menten Km values, were compared with those obtained from integrated progress curves of the time course of P uptake by plants from solutions undergoing P depletion. Browntop (Agrostis tenuis) achieved almost maximum growth at 3 μM P, but white clover (Trifolium repens) appeared to need P concentrations greater than 5 μM. This difference could account for much of the competitive superiority of browntop over white clover when they are grown in association under low P supply.
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机译：溶液培养物（其中与土壤分离但与土壤保持平衡的扩展土壤溶液）用于在0.2-5μMol P /升范围内恒定P的受控条件下生长牧草植物。将植物在整个生育期内对磷的反应（如Michaelis-Menten Km值所示）与从经历磷消耗的溶液中植物吸收磷的过程的综合进展曲线中获得的响应进行比较。褐顶（Agrostis tenuis）在3μM P时几乎实现了最大生长，但白三叶草（Trifolium repens）似乎需要大于5μM的P浓度。这种差异可以解释褐顶在低磷供应下联合生长时相对于白三叶草的竞争优势。
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