Conservation of the Land, and the Use of Waste Materials for Man's Benefits: Prepared for ....

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Page 21 - Class I soils have few limitations that restrict their use. Class II soils have some limitations that reduce the choice of plants or require moderate conservation practices. Class III soils have severe limitations that reduce the choice of plants or require special conservation practices, or both. Class IV soils have very severe limitations that restrict the choice...
Page 27 - Society American Society for Horticultural Science American Society of Agricultural Engineers American Society of Agronomy American Society of Animal Science...
Page 27 - Report of the Ad Hoc Panel on the Present Interglacial," Federal Council for Science and Technology, Science and Technology Policy Office, National Science Foundation, August, 1974, p.
Page 37 - Difficult on- farm management problems are created by the physical properties of these materials. Application techniques are Inefficient and time consuming. When liquid sludges are applied to the surface of the soil, a drying interval is required, and this loss of time can result in costly delays In seeding. The production of animal manures and sewage sludges Is continuous, whereas the needs for fertilizers are seasonal. Thus, storage la required by either a distributor or the farmer.
Page 38 - So little is known about this hazard at present that it cannot be properly evaluated. Of primary concern as potential toxicants are zinc, copper, nickel and especially cadmium. 7. Sewage sludges contain pathogenic bacteria, viruses and parasites that represent a public-health risk to farm workers and the public via the food chain. The degree of risk depends on the processing of the sludge and on its management on the farm, but experiences with application of sludge to land in a number of locations...
Page 27 - Society of Nematologists. Soil Science Society of America. Weed Science Society of America.
Page 15 - Estimates of these societal costs include $83 million for dredging channels and harbors, $50 million for reservoir sedimentation and flood plain overwash and $25 million for added maintenance and turbidity removal by industry and cities.
Page 37 - The limitations or obstacles to the present use of increased efficiency of use of these materials include the following: 1 . Animal manures and sewage sludges, as sources of plant nutrients, are bulky, low-grade fertilizers of variable composition. The total plant nutrient content is only 1 0 to 20 percent of that of most commercial chemical fertilizers.
Page 37 - Concentrations of nutrients, soluble salts, trace elements and water vary tremendously and are seldom known. Optimum rates of application are thus difficult to predict. 2. As low-grade fertilizers, these materials cannot be transported more than a few tens of miles before the costs of transportation exceed their fertilizer value. Many animal confinement facilities and many large cities lack agricultural land within economic transportation distances of the point of production. 3. Difficult on- farm...
Page 38 - One obstacle to the use of processed animal manure as a feed ingredient has been the concern for possible transmission of pathogens and undesirable organic residues into food products. Because of this concern, Federal and state government agencies have been slow to approve the practice. 12. The lack of meaningful guidelines that can be interpreted •on a regional basis or in terms of local...

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