Effects of Ammonium Nutrition on Water Stress, Water Uptake, and Root Pressure in <i>Lycopersicon esculentum</i> Mill

Abstract

Ammonium (NH(4) (+)) nutrition inhibits water uptake and root exudation and decreases leaf water potential of tomato plants grown in solution culture. This inhibition is readily reversible by NO(3) (-) for short term exposures to NH(4) (+); however, recovery is delayed following long term exposures.