Prolonged Leaching of Orthic Black Ah Material with Water and Aqueous Extracts of Populus Tremuloides and P. Balsamifera Leaves
Journal of Soil Science
Cylinders filled with Orthic Black Ah material were leached over a 2-year period with distilled water or with aqueous extracts of aspen or black poplar leaves that were collected late in the growing season.
Actual losses from the soil and chemical analyses of the leached soil indicated that the aqueous extract of aspen poplar leaves imposed greater changes on the chemical properties of the soil than did the extract of black poplar leaves. These changes were particularly noticeable for pH, total and exchangeable Ca, and 0.1N NaOH-extractable C. The aqueous extract of aspen poplar leaves acidified the soil more strongly than the extract of black poplar leaves, even though there was little difference between the two extracts in polyphenol and polysaccharide content and the total acidity of the black poplar extract was about twice that of the aspen poplar extract.
Aqueous extract of weathered aspen poplar leaves was no more effective than distilled water.
Dormaar, J.F. 1971. Prolonged leaching of orthic black ah material with water and aqueous extracts of populus tremuloides and p. balsamifera leaves. Journal of Soil Science. 22(3): 350-358.