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  • Author or Editor: L. B. Fenn x
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Abstract

Water was translocated from pecan [Carya illinoinensis (Wangenh.) K. Koch ‘Burkett’], grape (Vitis vinifera L. ‘Thompson Seedless’) and tomato (Lycopersicon esculentum Mell. ‘Ace’) roots growing in a moist soil medium, across stem or crown tissue into roots growing in a dry soil medium, and was exuded during periods of high transpiration. Those portions of pecan and grape roots in a dry soil medium (wilting point) were maintained in an absorptive condition for 30 days, whereas tomato roots were injured.

Open Access

Abstract

Several different split-root techniques, both horizontal zonation (1, 3, 6) and vertical zonation (2, 4, 7, 8), have been employed to study plant growth and water and nutrient uptake from differentially salinized root zones. High salinity level in one portion of the root zone may not affect overall plant performance if other portions of the root zone are relatively salt free (1, 3, 8). With uniform salinization, sodium chloride concentrations up to −0.8 MPa did not affect the 15N absorption rate in cotton, but osmotic pressures of −1.2 MPa substantially reduced it. However, water uptake and plant growth were affected to a greater extent than was 15N absorption (5).

Open Access