Abstract
Abstract Fertilization of tomato (Lycopersicon esculentum Mill.) in solution culture with NH4-N resulted in reduced shoot and root concentration of Ca, Mg, K, P, and NO3, increased leaf and root resistances to water flux, and decreased water use efficiency as compared to plants cultured with NO3-N. Solution adjustment to pH 6.5 decreased shoot/root fresh weight ratio with both N forms; decreased leaf diffusive resistance and water stress but increased root resistance to water flux and shoot NH4 concentration under NH4-N nutrition. Solution pH had little effect on tissue ion concentration.
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