Pamphlets on Conservation of Natural Resources, Band 16U.S. Government Printing Office, 1952 |
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... leaves decompose , and along with the remains of animals large and small , contribute organic matter to the soil . Biological processes as well as weathering therefore build soil . Soils pass through a development period the same as ...
... leaves decompose , and along with the remains of animals large and small , contribute organic matter to the soil . Biological processes as well as weathering therefore build soil . Soils pass through a development period the same as ...
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... leaves , fruits , and stems ; dead insects , worms , and other animals ; live and dead bacteria , fungi , and protozoa ; various products of the decomposition process , and active micro- organisms . Excluding litter , the amount of ...
... leaves , fruits , and stems ; dead insects , worms , and other animals ; live and dead bacteria , fungi , and protozoa ; various products of the decomposition process , and active micro- organisms . Excluding litter , the amount of ...
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... leaves as in the forest , since the volume above ground in the case of grasses obviously is small . Instead , it is chiefly due to the large volume of roots , which die , decompose , and remain in place . Humus decomposes rapidly in the ...
... leaves as in the forest , since the volume above ground in the case of grasses obviously is small . Instead , it is chiefly due to the large volume of roots , which die , decompose , and remain in place . Humus decomposes rapidly in the ...
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... 3 Percolation : the movement of water through soil . 4 Transpiration : the loss of water vapor from a plant , chiefly through the leaves . 16 1 Precipitation Ground Surface Infiltration THE WATER CYCLE Surface Temporary storage.
... 3 Percolation : the movement of water through soil . 4 Transpiration : the loss of water vapor from a plant , chiefly through the leaves . 16 1 Precipitation Ground Surface Infiltration THE WATER CYCLE Surface Temporary storage.
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... woodland . No land in the Midwest is known to be managed. The protective cover of the woodland is evident here in the overhead canopy and in the undergrowth below . Leaves of sugar maple exposed to sunlight . Note horizontal. 22.
... woodland . No land in the Midwest is known to be managed. The protective cover of the woodland is evident here in the overhead canopy and in the undergrowth below . Leaves of sugar maple exposed to sunlight . Note horizontal. 22.
Häufige Begriffe und Wortgruppen
agencies Agriculture animals areas birds booklet boys brush burned CALIFORNIA LIBRARY camp cent Chuck Coast Redwood CONCERN FOR TOMORROW conservation education CONSERVATION-CONCERN FOR TOMORROW County Division erosion farmers feet field fish forest fires forest land Forest Service forestry grass grazing ground grow growth habitat Halliday hardwoods harvest Illinois important inches increased industry insects International Paper Company irrigation JACKIE JACKIE DAVIS Jerry lakes logs looked materials mineral natural resources nursery Ohio organizations outdoor parks pasture pine plant plow practices present problems production protection pulp PULPWOOD pupils rain recreation redwood River school forest seedlings seeds shortleaf pine slope South Southern species stand streams supply teachers terrace timber tion topsoil Tree Crop tree farm U.S. Forest Service Uncle Charles United UNIVERSITY OF CALIFORNIA Valley watershed wild wildlife wood wood pulp woodland woodlot
Beliebte Passagen
Seite 18 - Helen Heffernan, Chief, Bureau of Elementary Education, California State Department of Education; Herbert Gwinn, Consultant in Secondary Education, California State Department of Education; Sven G.
Seite 30 - ... of soil conservation was needed. Out of the knowledge of every scientific discipline which could contribute, from the technique of every agricultural profession which could be made to play a part, a coordinated plan of soil conservation is being built. Since 1933, when the Soil Erosion Service (now the Soil Conservation Service of the US Department of Agriculture) was established, there has been a tremendous expansion of work in soil conservation. New techniques have been developed and old ones...
Seite 32 - When the common law was adopted in 1850, it was made the rule of decision in all the courts of this state, so far as it was not repugnant to or inconsistent with the constitution of the United States, or the constitution or laws of this state. At that time the principal industries of the state were mining and cattle raising. To encourage and promote these industries, acts were passed by the legislature, before the adoption of the common-law, which have been held...
Seite 23 - Section 52200, within or without the boundaries of the school district and for that purpose employ instructors, supervisors, and other personnel and provide necessary equipment and supplies. (b) Transport or arrange...
Seite 30 - ... their variety and classification (exhaustible, such as, petroleum and minerals, and renewable, such as soils, forests, and wildlife) ; their geographic distribution and availability; their value and importance to man; their national, state, and local importance. 2. To present vividly the fact that all human activities and institutions have their bases in, and are dependent on, natural resources. The standard of living of a locality or a state reflects the condition of the resources of the locality...
Seite 10 - ... materials ; feeding trays, bird houses ; work on the improvement of home and school grounds ; adoption of some local feature, park, or landmark to protect ; responsibility for the custodianship of school equipment, surveying local flood control, irrigation, purification, softening, or other water problems. b. Having presented the facts on our natural resources and provided pertinent related activities, we can, with assurance, let intelligence take its course in the matter of developing a philosophy...
Seite 22 - I will never disgrace these sacred arms, nor desert my companion in the ranks. I will fight for temples and public property, both alone and with many. I will transmit my fatherland, not only not less, but greater and better, than it was transmitted to me.