Growth and water use of Lolium perenne. II Plant growth.
In Lolium perenne plants leaf and root extension growth decreased by 50% when plant water potential decreased from -3 bar to -6 bar and growth stopped at -16 bar. Dry matter accumulation and leaf area also decreased because of slower expansion growth. A small decrease in soil-water potential had a large effect on growth because of the more rapid decrease in plant water potential due to a large resistance. The causes of increased plant resistance and decreased growth are briefly discussed.