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Published in Soil Sci Soc Am J 42:753-756 (1978)
© 1978 Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Absorption Rates of Ammonium and Nitrate by Red Kidney Beans under Salt and Water Stress1

J. N. E. Frota and T. C. Tucker2

ABSTRACT

The purpose of this study was to gain additional knowledge regarding the influence of salinity and water deficit on plant uptake of NH4+ and NO3-. The absorption patterns of NH4+ and NO3- 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 15N. Salt and water stress inhibited the absorption of both NH4+ and NO3-. There was no difference between these two stress treatments in NH4+ uptake, but carbowax restricted NO3- uptake more than did NaCl. Under NaCl salinity the plants absorbed the same amount of N independent of N source; under water stress more NH4+ than NO3- 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.

NOTES

1 Contribution from the Dep. of Soils, Water & Engineering, Arizona Agric. Exp. Stn., Tucson, AZ 85721. Published with approval of the Director as Journal Article no. 2812.

2 Former Graduate Student and Professor, respectively, Dep. of Soils, Water & Engineering, Univ. of Arizona. The senior author is now located at Fortaleza, Ceara, Brazil.

Received for publication January 13, 1978. Accepted for publication May 16, 1978.






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