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Estimating Crop Residue Decomposition from Air Temperature, Initial Nitrogen Content, and Residue Placement
Author(s) -
Douglas C. L.,
Rickman R. W.
Publication year - 1992
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1992.03615995005600010042x
Subject(s) - residue (chemistry) , triticale , hordeum vulgare , crop residue , agronomy , winter wheat , poaceae , nitrogen , environmental science , mathematics , chemistry , water content , biology , ecology , agriculture , biochemistry , geotechnical engineering , organic chemistry , engineering
Managing cereal residues to control soil erosion by wind and water requires knowledge of residue decomposition. Four equations were developed to estimate decomposition of cereal residues based on cumulative degree days (CDD) calculated from daily maximum and minimum air temperature. Each is based on the general equation Rr = Ir exp( f N f W k CDD), where Rr = residue remaining, Ir = initial residue, f N is an N coefficient based on initial residue N content, f W is a water coefficient based on a combination of residue and field management, and k is a general decomposition coefficient. Projected decomposition was tested against data for different varieties of soft white and hard red spring and winter wheat ( Triticum aestivum L.), durum wheat ( T. durum Desf.), spring and winter barley ( Hordeum vulgare L.), triticale (× triticosecale Wittm.) corn ( Zea mays L.), and soybean [ Glycine max (L.) Merr.] from Alaska, Idaho, Indiana, Missouri, Oregon, Texas, and Washington. The mean slope of the line relating observed to projected decomposition for all locations was 1.10 ± 0.543 with r 2 values ranging from 0.76 to 0.99, with most > 0.95.