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CIGR Handbook of Agricultural Engineering, Volume V Energy and Biomass Engineering, Chapter 3 Biomass Engineering, Part 3.4 Green Manures and Forage Legumes

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.org

Citation:  CIGR Handbook of Agricultural Engineering, Volume V Energy and Biomass Engineering, Chapter 3 Biomass Engineering, Part 3.4 Green Manures and Forage Legumes, pp 288-297.  .(doi:10.13031/2013.36422)
Authors:   F. R. Magdoff
Keywords:   Section Headings: 3.4.1 Background, 3.4.2 Effects on Soil and Crops, 3.4.3 Types of Green Manure and Forage Legume Crops, 3.4.4 Using Green Manure Crops in Different Cropping Systems, 3.4.5 Energy Implications of Use of Green Manures and Forage Legumes

First paragraph: Green manure crops, now also commonly referred to as cover crops, are those crops grown specifically to improve the soil and are generally not harvested for sale. Although the terms green manures and cover crops are now used interchangeably, they originally referred respectively to crops grown to add organic matter (and/or N) to a soil and those that were grown primarily to maintain soil cover for erosion control. In addition, the term catch crops was commonly used to refer to crops grown for the purpose of taking up available nutrients following the growth of the main economic crop. Because soilimproving crops have many different effects on soils and subsequent crops and they are usually grown with multiple purposes in mind, the original distinctions between the various terms have become less significant. Sod crops grown as part of a rotation may also have many of the same effects as those of green manure crops. Forage legumes are therefore included in the discussion below.

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