| Abstract: | Influence of varying Mg supply to barley on thousand grain weight and the P fractions of grains By variation of the Mg concentration in the nutrient solution (0.2; 0.6 and 1.8 me Mg/l respectively) during tillering, shooting and grain filling it could be shown, that increasing Mg supply to barley especially favours number of ears/plant (tillering) and grain size (thousand grain weight, TGW). A positive correlation was found between Mg content of grain and TGW. In small grains, which had a Mg content of 0.06% Mg in DM, about 64% of grain-P was present as Phytin-P and 20% as inorganic P. In bigger grains being also higher in Mg content, however, 70% was Phytin-P and only 10% Pi. This change in the pattern of P-fractions due to the Mg nutrition might be of a certain relevance to the regulation of starch synthesis within the grain and accordingly of grain growth. |
