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Subjects United States Remove constraint United States: United States Subjects tillage Remove constraint tillage: tillage Subjects crops Remove constraint crops: crops

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1. Conservation tillage--a hot, new idea from the distant past.

Author:: Magleby, R.S. , Schertz, D.L.
Subject:: natural resource management , tillage , crops , soil erosion , cost benefit analysis , United States
Physical description:: p. 165-169.
Collection:: Rural Development Publications Collection
Series:: Yearbook of agriculture
Part Of:: Yearbook of agriculture. 1987

2. Nitrogen management strategies to reduce nitrate leaching in tile-drained midwestern soils

Description:: Includes references
Author:: Dinnes, D.L. , Karlen, D.L. , Jaynes, D.B. , Kaspar, T.C. , Hatfield, J.L. , Colvin, T.S. , Cambardella, C.A.
Subject:: soil fertility , nitrogen , soil management , leaching , tile drainage , groundwater , groundwater contamination , water pollution , surface water , water quality , tillage , crops , soil organic matter , hydrology , air temperature , precipitation , monitoring , crop rotation , cover crops , conservation tillage , nitrification inhibitors , wetlands , biofiltration , application rate , literature reviews , United States
Collection:: Journal Articles, USDA Authors, Peer-Reviewed
Year:: 2002

3. Some of the world's best farmland is here.

Author:: Birdwell, B.T.
Subject:: tillage , soil , agricultural land , crops , soil erosion , land , soil classification , United States
Physical description:: p. 91-93.
Collection:: Rural Development Publications Collection
Series:: Yearbook of agriculture
Part Of:: Yearbook of agriculture. 1987

4. The land is shaped by weather and climate.

Author:: Strommen, N.D. , McArdle, R.C.
Subject:: climatic zones , weather , land , wind , water , solar energy , crops , tillage , irrigation , United States
Physical description:: p. 238-242.
Collection:: Rural Development Publications Collection
Series:: Yearbook of agriculture
Part Of:: Yearbook of agriculture. 1987