Responses to phosphorus among barley genotypes

摘要: Genetic improvement in phosphorus (P) use efficiency (i.e. the ratio of biomass or yield at nil P to that a given rate application) is an important goal improve recovery and farming systems. Experiments were conducted three sites South Australia between 2009 2011 characterise genetic variation with no applied response fertiliser among diverse range barley (Hordeum vulgare L.) genotypes. In each experiment, 39–54 genotypes grown 0 30 kg P/ha. Responses measured near beginning stem elongation by using normalised difference vegetation index (NDVI) harvesting grain. Rhizosheath size was also on seedlings. Consistent differences growth 0 kg P/ha By contrast, there large environmental effects responses P, but some showed consistent responses. Measurements growth, uptake subset most could be attributed P-uptake (net total per unit available P) rather than P-utilisation (biomass uptake). The rhizosheath made small contribution NDVI not grain yield, suggesting may benefit early this does persist through yield. correlations often weak generally positive 0 kg P/ha. Correlations low negative. study identified several P; however, selection for based solely vegetative appropriate. Variation appeared more barley.