Abstract
The pH of the nutrient solution bathing the roots of four-month-oldPinus contorta var.latifolia Englm. seedlings was monitored continuously between additions of nutrients. Nitrogen was supplied in the form of NH4NO3, and was added three times per week in amounts relative to seedling fresh weight. No pH change was associated with the nutrient addition cycle; however, extinguishing of the lights at night resulted in a decrease in pH of almost half a pH unit in the first hour. The pH reverted to normal within a few hours. Re-illumination resulted in a pH increase of a smaller magnitude, but over a similar time span. Estimation of the proton extrusion rate gave values of about 17 µmol (g FW root)−1 h−1.
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Stewart, J.D., Lieffers, V.J. Diurnal cycles of rhizosphere acidification byPinus contorta seedlings. Plant Soil 162, 299–302 (1994). https://doi.org/10.1007/BF01347717
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DOI: https://doi.org/10.1007/BF01347717