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Dry Matter Yield and Nitrogen-15 Uptake by Tomatoes Under Sodium Chloride Stress

Department of Soil and Water Science, 429 Shantz Bldg., #38, Univ. of Arizona, Tucson, AZ 85721

*Corresponding author.

ABSTRACT

An absorption study was conducted in nutrient solution with seedlings of tomato (Lycopersicon esculentum Mill.; cv. Columbia) to observe the effects of NaCl on (¹⁵N) uptake and distribution in plant roots and shoots. The 14-d-old seedlings were grown for 16 d (14 d as group of 6 plants per container and 2 d after the final transfer of 2 plants per container) in complete Hoagland solution no. 1, then salinized (except the controls, –0.03 MPa) to –0.3, –0.6, and –0.9 MPa osmotic potentials with NaCl. Nutrient solutions were sampled daily for N loss after addition of ¹⁵NH₄¹⁵NO₃ to the pots. The cumulative ¹⁵N loss was considered to be absorbed by plants. Lowering the osmotic potential of the culture solution decreased total N uptake at all salinity levels, and ¹⁵N uptake of the plants at medium (–0.6) and high (–0.9 MPa) salinity levels. A low level of salinity (–0.3 MPa) did not affect ¹⁵N uptake compared with the control (–0.03 MPa). Water uptake and dry matter yield were affected to a greater extent than ¹⁵N absorption. Nitrogen-15 concentration was slightly higher in roots than in shoots.

Contribution of Dep. of Soil and Water Science.

Received for publication August 18, 1987.