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Management Restrictions in Soil Application of Manure^{1 ,2,}

University of California, Riverside 92521

Abstract

The nature of manures and the factors that present management restrictions on applications of manure to lands, are discussed. Because manures are low-grade fertilizers and/or soil amendments that have various quantities of water and nutrients, depending on the species of animal, the ration and on management of the manure after it is produced, general management recommendations have little meaning. Pathogens do not present restrictions on amounts of manures used when manure is incorporated into the soil on cropped lands but can limit the amounts used on pastures when surface applied. Crop yield reductions present serious limits for crops because of salt effects. Excess NO₃ in pasture and forage crops can limit the rates of application. Water quality degradation not only restricts the amounts of manures added but also the time of application and the condition of the land at time of applications. Accumulations of mineral elements that decrease the general physical and chemical quality of the soil as a medium for plant growth can also limit the total amount of manures added to a land area. Because of the many factors involved, meaningful recommendations can only be developed for the manures, the crops, the soils, and climate and other pertinent factors, such as water quality objectives and problems, in a local area or region.

¹ Paper presented as part of the Symposium on Alternatives in Animal Waste Utilization at Annual Meeting of the American Society of Animal Science, University of Wisconsin, Madison, July 23 to 27, 1977.

² Contribution from the Department of Soil and Environmental Sciences, University of California, Riverside, 92521.

³ Professor of Soil Science.