Growth and Phosphorus Uptake of Lupins (Lupinus angustifolius L. and Great Brome (Bromus diandrus Roth.) Grown in Different Phosphorus Concentrations in Solution Culture

Abstract

Investigation of the competitive abilities of lupin (Lupinus angustifolius) and great brome (Bromus diandrus) at different P supply under controlled conditions was aimed at understanding the mechanism of nutrient compectition between these two species. Under suboptimal P supply, great brome, with higher root area per unit root weight and relative growth rate, took up limited amounts of P faster than lupins. By so doing, great brome partly overcame its disadvantage of lower initial seed size within 35 days after transplanting, and had higher P productivity than lupins. However, under high P supply, lupins tended to have higher potential to respond to P than great brome.