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One-year-old (Old Home) OH87 and OH97 pear rootstocks were grown in 2-gallon containers under natural conditions at Corvallis, Ore., in in 1999. Uniform plants were harvested during August and September, and total leaf area, new shoot number and length, and root growth were measured. The kinetics of NH 4  +  and NO 3  -  uptake by new roots of both rootstocks were determined with the ion-depletion technique. OH87 had larger total leaf area, and more and longer shoots than OH97. Total root biomass was similiar between the two rootstocks, but OH87 had a larger proportion of new roots and more extension roots than OH97. Both rootstocks had lower Km values for NH 4  +  absorption than for NO 3  -  and therefore both had greater absorptive power for NH 4  +  than for NO 3  -  at the low nutrient concentrations. The maximum uptake rates (V max ) of OH97 were similiar for both NH 4  +  and NO 3  -  absorption, but OH87 had a much higher maximum uptake rate for NO 3  -  than for NH 4  + .

167 Nutrient Uptake and Growth Performance of OH87 and OH97 Pear Rootstocks