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Oregon State University - Extension Service

State Library of Oregon: Oregon Documents

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Soil acidity in Oregon: understanding and using concepts for crop production

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TitleSoil acidity in Oregon: understanding and using concepts for crop productionPersonal NameHart, John M. (John Mervyn) 1947-Corporate NameOregon State University Extension ServiceSubjectAcid soils -- OregonLiming of soils -- OregonNitrogen fertilizers -- Environmental aspects -- OregonDate2013CollectionOregon State University - Extension Service Last edited by: Angie Jannelli

LanguageengSeries TitleEM (Oregon State University. Extension Service) Series Numbering9061Formonline resourceExtent1 online resource (22 pages)Type of ResourcetextIssuancemonographicSummary"Quick facts: Nitrogen (N) fertilizer application is the predominant management practice that causes soil acidification (declining soil pH). Nitrogen fertilizers that supply N only in the ammonium (NH4) form are the most acidifying (page 6). Crops and varieties differ in tolerance to soil acidity. Recommended minimum pH values for a wide range of crops are listed in Table 9 (pages 18-19). Lime is recommended to maintain soil pH above recommended values. Increased soil acidity can injure plants by a number of mechanisms, including: [1] Increasing the amount of soluble aluminum (Al) and manganese (Mn) in soil to toxic levels (pages 9-11) [2] Reducing the amount of plant-available phosphorus (P), calcium (Ca), and molybdenum (Mo) (pages 11-13)Some legumes are very sensitive to soil acidity because soil acidity inhibits N fixation by bacteria of the genus Rhizobium. These bacteria require high soil levels of Ca and Mo, which are limited at low pH. Under acidic soil conditions, legume roots may have few nodules or their nodules may be ineffective at N fixation (page 13). Information on pH and weed management (pages 20-21) and on soil pH monitoring (pages 7 and 15) is also contained in this publication. Neutralizing soil acidity with lime is discussed in companion publications (page 2)."NoteJ.M. Hart [and others]"July, 2013."Includes bibliographical references (pages 16-17)

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Library ClassificationHEO/Ex8OCLC Number854667404Restrictions on Accesshttp://rightsstatements.org/vocab/CNE/1.0/