Mineral nutrition in Scotch pine on rendzina soils. I. Effect of concentrations of calcium, magnesium, and bicarbonate in the medium on the nutrition of the seedlings in sand cultures

Riispere, A.

Izv Akadnauk Est Ssr Ser Biol Nauk 15(4): 530-550

1966


Accession: 025020059

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Abstract
At a sufficient level of supply with all nutrient elements, the varying of ratio between Ca, Mg and K in nutrient medium does not affect seriously the growth of seedlings in spite of considerable deviations in their nutrient content. At the same time, the effect of ratio between cations is dependent on pH and the level of supply with titrate and phosphate in rooting medium. Under given conditions, the growth of seedlings is strongly correlated with the ratio (Ca + Mg)/K in needles. The scotch pine seedlings are tolerant to progressively higher concentrations of Ca and Mg in nutrient medium, despite a two-threefold increase in their content of assimilating organs. At a sufficient supply of all nutrient elements, the increasing concentrations of Ca and Mg in rooting medium did not induce any considerable antagonism in the absorption of other nutrient elements. Ca in exchangeable form is poorly available to pine seedlings. Therefore, the accumulation of Ca within plants does not increase even in the case of an abundance of exchangeable Ca in rooting medium. This cation is more easily absorbed from CaCO3. The scotch pine seedlings are susceptible to increased concentrations of bicarbonate (as compared with equivalent concentrations of Ca and Mg). A high level of bicarbonate in nutrient medium tended to decrease the synthesis of chlorophyll, resulting in developed chlorosis. The cause of toxic effects of high levels of bicarbonate in nutrient solution seems to exist in the inactivation of iron within roots as well as in the inhibited absorption of the basic nutrient elements (N, P, Ca and Mg).