Effects of Insolation and Soil Characteristics on Tissue Fluid Reaction in Wheat

Plant buffer systems in relation to the absorption of bases by plants

“…In a similar experiment with tomato plants which were let stand some time at room temperature before pressing, the following values were obtained: The changes of pH are very small and may not be significant. It must also be concluded, from the work of Loehwing (10) that while changes in pH may be produced by the effect of light, they are not always of the large magnitude reported by Ingalls and Shive. Data thus far published do not permit comparisons of temperature effects during the dark periods.…”

“…The evidence for similar variations in agricultural plants has been recently reviewed by Loehwing. (10) Perhaps the largest changes are those cited by Ingalls and Shive. (6) They report that buckwheat stem sap may vary from pH 4.4 to 4.8 and leaf sap from pH 4.9 to 5.4, according to the time of day.…”

“…Frequently the results of such experiments are lacking in consistency, and the biological errors involved have not always been given due consideration. Loehwing (10) has recently studied wheat plants grown on humus and loam soils. The plants from the lime-treated soils in all cases showed a decrease in acidity.…”