2. Impact of agricultural practices on soil pollution.
Outlook on agriculture, 20, 3, 1991, pp. 153-160
There is a growing appreciation of the need to preserve soils and their chemical status.
There is an urgent requirement to understand and quantify the various inputs and outputs in order to devise protection policies for this key resource.
This paper focuses on the problems that result from high inputs of plant nutrients, from fertilizers or animal excreta, and from the pesticides that are associated with intensive production. Concern is not only about the direct effects on soils but also on leakages to both water and the atmosphere.
Soils are the base resource for food production.
Their physical and chemical properties are wide-ranging, allowing them to act as sinks or sources in complicated cycles and buffer changes in the flows of materials to other compartments of the ecosystem.
Man's activities can disturb the equilibria involved through
- manufacturing and energy-related activities, resulting in atmosheric inputs of sulphate, acidity, nitrogen (N) and trace metals, for example, or indeed accidental inputs of radio- nucleides,
The effects of agriculture can be physical, induced by mechanically working the soil in an inappropriate way to result in, for example, soil compaction or erosion, or they may be chemical.
This article is concerned with some of the problems associated with chemical changes.
In detail, the effects of fertilizers, slurries and manures from housed livestock and pesticides are discussed.
1239 92 - 12/65
USA, field study, greenhouse study, organic biostimulants, low-input agriculture, forestry, horticulture, plant growth, stress resistance, fertilizer application, organic agriculture
RUSSO, R.O. and G.P. BERLYN
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