Variation in the Interactions among soil K+, Ca++, Mg++ and Na+ions as influenced by the variety and rootstock in grape
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Society for Promotion of Horticulture
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A nutritional survey was conducted to study the influence of variety and rootstock on interaction among K+, Ca++, Mg++and Na+ions in grape during 2012-14. Soil cation contents did not correlate with their respective contents in petioles indicating a strong antagonism among them. Quadratic relationship of soil cations with the absorption (ratio of petiole content to soil content) of other ions revealed that the antagonism among cations was observed in case of soil K+ with Ca++ and Na+ absorption on 110R and Dog Ridge rootstocks, soil Ca+ with K+ and Mg++ and Na+ in Sonaka variety and Na+ in own rooted vines, soil Mg++ with Ca++ and Na+ also in own rooted vines; and Na++ with Ca++ and Mg++ respectively in 2A clone and Dog Ridge. Contrarily, increased absorption of K+ by soil Ca++ on 110R, Na+ and K+ by soil Mg++ respectively in Sonaka and 110R, and Ca++ by soil Na+ on Dog Ridge was also observed. All the soil cations together influenced K+ absorption most in Sonaka followed by Mg++ absorption in 2A clone, but Ca++ absorption on Dog Ridge followed by K+ on 110R.
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