BIOMASS, SHOOT UNIFORMITY AND YIELD OF WINTER BARLEY

The results of field experiments in 1983/84 and 1984/85 were used to t est the hypotheses (i) that cultivars and management systems which res ult in high biomass of winter barley will also produce high grain yiel d and (ii) that greater uniformity of tiller and ear size is associate d with greater yield. In a set of cultivars, grain yield per plant was significantly correlated with biomass per plant despite no correlatio n with any individual yield component. Biomass per shoot was significa ntly correlated with grain yield per shoot. Treatments to increase sho ot uniformity (the mass of individual tillers relative to that of the main stem) generally increased biomass per shoot and grain yield per s hoot. The re-examination of data in the literature where yield and bio mass were available confirmed the association of biomass and grain yie ld both on a per plant and per shoot basis. It is argued that harvest index is not a character which can be easily targeted for manipulation by growers, whereas crop management systems to increase biomass shoul d be easier to specify.