The purpose of this study was to gain additional knowledge regarding the influence of salinity and water deficit on plant uptake of NH 4 + and NO 3 ‐ . The absorption patterns of NH 4 + and NO 3 ‐ by red kidney beans ( Phaseolus vulgaris L.) were determined under normal conditions (control), NaCl treatment (salt stress), and carbowax treatment (water stress) using an inverse isotope dilution technique with 15 N. Salt and water stress inhibited the absorption of both NH 4 + and NO 3 ‐ . There was no difference between these two stress treatments in NH 4 + uptake, but carbowax restricted NO 3 ‐ uptake more than did NaCl. Under NaCl salinity the plants absorbed the same amount of N independent of N source; under water stress more NH 4 + than NO 3 ‐ was absorbed. Water absorption was reduced by both stress treatments; N and water uptake were highly correlated. Root permeability decreased in plants subjected to stress. Dry matter production and total N per plant decreased, but the N percentage increased in the stressed plants.
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Frota et al. (1978) studied this question.