Plant Leaves Left On Soil
Many plants produce organic acids. Where plant litter accumulates on or is incorporated to the soil, these acids (including acetic acid, humic acid (see http://www.suprahumic.unina.it/), oxalic acid, and tannic acid) are liberated. This is especially acute in soils under coniferous trees such as pine, spruce and fir, which return fewer base cations to the soil than do most deciduous trees.
Read more about this topic: Soil Acidification
Famous quotes containing the words plant, leaves, left and/or soil:
“Here come the line-gang pioneering by.
They throw a forest down less cut than broken.
They plant dead trees for living, and the dead
They string together with a living thread.”
—Robert Frost (1874–1963)
“The camera has an interest in turning history into spectacle, but none in reversing the process. At best, the picture leaves a vague blur in the observer’s mind; strong enough to send him into battle perhaps, but not to have him understand why he is going.”
—Denis Donoghue (b. 1928)
“I tell you there isn’t a thing under the sun that needs to be done at all, but what a man can do better than a woman, unless it’s bearing children, and they do that in a poor make-shift way; it had better ha’ been left to the men.”
—George Eliot [Mary Ann (or Marian)
“Let him
Who was love’s teacher teach you too love’s cure;
Let the same hand that wounded bring the balm.
Healing and poisonous herbs the same soil bears,
And rose and nettle oft grow side by side.”
—Ovid (Publius Ovidius Naso)