“In both the kinds of land we have been considering [i. e., classes of very fertile soil, rich in humus], we have supposed the humus to be mild, or exempt from acidity. J Sour or acid humus totally destroys the fertility of a soil; sometimes, however, the soil contains so very small a portion of acidity that its fertility is very slightly diminished, and only with regard to some few plants. Barley crops become more and more scanty in proportion as the acidity is increased; but oats do not appear to be at all affected by it. Rye grown on such land is peculiarly liable to rust, and is easily laid or lodged. The grains of all the oereals become larger, but contain less farina. Grass which grows on these spots is, both in species and taste, less agreeable, and less suitable for cattle, than any other, although it yields a very considerable produce in hay. In fact, in exact proportion with the increase of acidity, is the decrease of the value of the soil…”

—  Albrecht Thaer

p. 345 http://books.google.com/books?id=zAhJAAAAMAAJ&pg=PA345, as cited in Ruffin (1852, p. 85).
The Principles of Agriculture, 1844, Section III: Agronomy

Adopted from Wikiquote. Last update June 3, 2021. History

Help us to complete the source, original and additional information

Do you have more details about the quote "In both the kinds of land we have been considering [i. e., classes of very fertile soil, rich in humus], we have suppos…" by Albrecht Thaer?
Albrecht Thaer photo
Albrecht Thaer 34
German agronomist and an avid supporter of the humus theory… 1752–1828

Related quotes

Albrecht Thaer photo

“When humus remains constantly damp, without, however, being covered with water, it forms a very unpleasant smelling acid, which is more particularly, characterized by the property which it possesses of colouring blue litmus paper into red. This circumstance has long been known, and it is the reason that land and meadows which are not properly drained, and which exhibit these phenomena, are called sour. We have carefully examined these facts, and have endeavoured to discover the peculiar constitution of this acid. At first, we were inclined to regard it as being of a distinct nature, and having carbon for its base; but we have since become convinced that it is generally composed of acetic acid, and occasionally contains a portion of the phosphoric. This latter always adheres so firmly to the humus that it cannot be separated from it either by boiling or washing. The liquid in which the humus is boiled certainly acquires a slight acid flavour, but the greater part of the acid remains attached to the humus.
This acid or sour humus it not at all of a fertilizing nature; on the contrary, it is prejudicial to vegetation* Where it is very strong and pervades the whole of the humus, the soil only produces reeds, rushes, sedge, and other useless, unpalatable plants; and whenever these abound, it may be inferred that the soil contains a great deal of sour or acid humus… There are various means of getting rid of this baneful property, and rendering the humus fertile. It is well known that with the aid of alkalies, ashes, lime, and marl, humus may be deprived of its acidity, and rendered easily soluble… Heaths do not thrive where this humus does not exist, and when they have established themselves in one particular spot, they suffer few other plants to appear. This humus may be changed by a dressing composed of marl, lime, or ammonia; and where this has been mixed with the soil, the heaths, &c., speedily perish.”

Albrecht Thaer (1752–1828) German agronomist and an avid supporter of the humus theory for plant nutrition

Source: The Principles of Agriculture, 1844, Section III: Agronomy, p. 343-4, as cited in Ruffin (1852, p. 85).

Albrecht Thaer photo

“In the greater number of cases, peat is very much like acid or sour humus; indeed, it sometimes resembles it so strikingly that it is impossible to distinguish these substances apart.”

Albrecht Thaer (1752–1828) German agronomist and an avid supporter of the humus theory for plant nutrition

Source: The Principles of Agriculture, 1844, Section III: Agronomy, p. 349, as cited in Ruffin (1852, p. 85).

Joshua Reynolds photo

“The mind is but a barren soil; a soil which is soon exhausted, and will produce no crop, or only one, unless it be continually fertilized and enriched with foreign matter.”

Joshua Reynolds (1723–1792) English painter, specialising in portraits

Discourse no. 6; vol. 1, pp. 157-8.
Discourses on Art

“The ashes of your existence will fertilize the soil for the universe to follow.”

Richard Kadrey (1957) San Francisco-based novelist, freelance writer, and photographer

Source: Sandman Slim

“The fate of the soil system depends on society's willingness to intervene in the market place, and to forego some of the short-term benefits that accrue from 'mining' the soil so that soil quality and fertility can be maintained over the longer term.”

Eugene P. Odum (1913–2002) mathematician, ecologist, natural philosopher, and systems ecologist

Eugene Odum (1993) Ecology and our endangered life-support systems. p. 143

“In this busy world, we should never be a stranger to love and compassion. It is the fertile soil in the garden of peace.”

Steve Maraboli (1975)

Source: Life, the Truth, and Being Free (2010), p. 89

David Attenborough photo

“If we and the rest of the backboned animals were to disappear overnight, the rest of the world would get on pretty well. But if they were to disappear, the land's ecosystems would collapse. The soil would lose its fertility. Many of the plants would no longer be pollinated. Lots of animals, amphibians, reptiles, birds, mammals would have nothing to eat. And our fields and pastures would be covered with dung and carrion. These small creatures are within a few inches of our feet, wherever we go on land – but often, they're disregarded. We would do very well to remember them.”

David Attenborough (1926) British broadcaster and naturalist

Closing lines
Life in the Undergrowth (2005)

“A mixture of damp peat moss and loamy soil spread around the roots is far better than fertilizer in any form. Do not saturate the hole in which a tree is to be planted with water.”

Ken Kern American writer

p, 125
The Owner-Built Homestead (1977)

Ernesto Che Guevara photo

“What are needed are the development of an ideological-cultural mechanism which permits both free inquiry and the uprooting of the weeds which multiply so easily in the fertile soil of state subsidies.”

Ernesto Che Guevara (1928–1967) Argentine Marxist revolutionary

Man and Socialism in Cuba (1965)

David Hume photo

“The richest genius, like the most fertile soil, when uncultivated, shoots up into the rankest weeds; and instead of vines and olives for the pleasure and use of man, produces, to its slothful owner, the most abundant crop of poisons.”

David Hume book Essays, Moral, Political, and Literary

Part I, Essay 16: The Stoic
Essays, Moral, Political, and Literary (1741-2; 1748)
Context: If nature has been frugal in her gifts and endowments, there is the more need of art to supply her defects. If she has been generous and liberal, know that she still expects industry and application on our part, and revenges herself in proportion to our negligent ingratitude. The richest genius, like the most fertile soil, when uncultivated, shoots up into the rankest weeds; and instead of vines and olives for the pleasure and use of man, produces, to its slothful owner, the most abundant crop of poisons.

Related topics