INFLUENCE OF BICARBONATE LEVEL ON IRON-CHLOROSIS DEVELOPMENT AND NUTRIENT-UPTAKE OF THE PEACH ROOTSTOCK MONTCLAR
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The peach rootstock Montclar [Prunus persica (Batsch) L.] was grown in sand culture supplied with half-strength nutrient Hoagland No. 1 solution with 10 M FeEDDHA at seven bicarbonate (HCO3) levels: 0, 2, 5, 10, 15, 20, and 25 mM. Montclar developed chlorosis only at HCO3- levels > 10 mM. Above this level, chlorosis increased as HCO3 level was increased. When HCO3- level increased, the contents of N, P, K, Ca, Mg, Fe, and Mn decreased; the concentrations of N, P, Ca, and Fe in the new branch growth decreased, but that of Mg and Mn did not change. The partitioning of N, P, Ca, Mg, and Fe to the new branch growth decreased, while the partitioning of K and Mn did not change. The partioning of Fe to the new branch growth decreased more than the partitioning of the other nutrients when the HCO3- levels were higher than 10 mM. At low HCO3- levels (< 10 mM), active-Fe content decreased with increasing HCO3- level, even though no chlorosis was observed. The correlation between chlorosis and Fe concentration of the new branch growth was higher than the correlation between chlorosis and active Fe concentration. 1993, Taylor & Francis Group, LLC. All Rights Reserved.
