College of Agriculture & Natural Resources
Environmental Science & Technology

Ray Weil


Department of Environmental Science and Technology
1119 H. J. Patterson Hall
College Park, MD 20742


  • B.S. in Crop Science from Michigan State University, East Lansing, MI, 1970.
  • M.S. in Soil Science from Purdue University, West Lafayette, IN, 1973.
  • Ph.D. in Soil Ecology from Virginia Tech, Blacksburg, VA, 1977.
Courses Taught: 

ENST 105 Soil and Environmental Quality (3 credits) Credit will be granted for only one of the following: ENST 105 or NRSC 105. Formerly NRSC 105. Soil as an irreplaceable natural resource, the importance of soils in the ecosystem, soils as sources of pollution, and soils as the media for the storage, assimilation or inactivation of pollutants. Acid rain, indoor radon, soil erosion and sedimentation, nutrient pollution of waters, homeowners' problems with soils, and the effect of soils on the food chain.

ENST 200 Fundamentals of Soil Science (4 credits). Prerequisite: CHEM 103, or CHEM 131 and CHEM 132; or permission of department. Credit will be granted for only one of the following: ENST 200 or NRSC 200. Formerly NRSC 200. Study and management of soils as natural bodies, media forplant growth, and ecosystem components. Morphology, composition, formation, and conservation of soils. Chemical, biological, andphysical properties are discussed in relation to the production of plants, the functioning of hydrologic and nutrient cycles, the protection of environmental quality, and engineering uses of soils. I download course syllabus I

ENST 411 Principles of Soil Fertility (3 credits) Prerequisite: ENST 200 or equivalent. Credit will be granted for only one of the following: ENST411 or NRSC411. Formerly NRSC 411. Soil factors affecting plant growth and quality with emphasis on the bio-availability of mineral nutrients. The management of soil systems to enhance plant growth bymeans of crop rotations, microbial activities, and use of organic and inorganic amendments. I download course syllabus I

ENST 441 Sustainable Agriculture (3 credits) Credit will be granted for only oneof the following: ENST441 or NRSC441. Formerly NRSC 441. Environmental, social and economic needs for alternatives to the conventional, high-input farming systems which currently predominate in industrial countries. Strategies and practices that minimize the use of non-renewable resources. Sustainable Agriculture (3 credits). I download course syllabus I

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