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Factors Influencing the Recovery of Glucosamine Nitrogen from Soils Commonly Cropped to Rice
Author(s) -
Roberts T. L.,
Ross W. J.,
Stiegler J. C.,
Norman R. J.,
Slaton N. A.,
Wilson C. E.
Publication year - 2012
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/sssaj2011.0005
Subject(s) - loam , soil water , zoology , amino sugar , chemistry , glucosamine , nitrogen , silt , environmental science , soil science , geology , biology , biochemistry , organic chemistry , paleontology
The Illinois soil N test (ISNT) is intended to predict the amount of mineralizable N in a soil by estimating the amount of amino sugar N present. The objective of this study was to compare the ISNT with a direct steam distillation (DSD) method for recovering 15 N‐labeled glucosamine added to soil collected from the 0‐ to 15‐, 15‐ to 30‐, 30‐ to 45‐, and 45‐ to 60‐cm depth increments. Four clay and four silt loam soils where chosen from rice ( Oryza sativa L.) production regions in the mid‐South United States. When the ISNT and DSD were compared across all soils and for all depths, the N liberated with the DSD was, on average, 19.2 mg N kg −1 soil greater than the N liberated with the ISNT. The ISNT recovered 89.2 to 97.9% and the DSD method 88.5 to 99.1% of the 15 N‐glucosamine added to the four soil depth increments for all eight soils. There was a significant interaction between soil depth and method; the ISNT recovered a greater amount of added glucosamine‐N from the 0‐ to 15‐cm depth than the DSD. Overall, the ISNT and the DSD methods recovered similar amounts of added glucosamine N from each soil depth below 15 cm but alkaline hydrolyzable N (AH‐N) and total N (TN) appear to influence the recovery of glucosamine when using the DSD. The results of this study indicate that the ISNT and DSD methods can recover similar amounts of glucosamine N in soils with different textures; however, the glucosamine N recovery by DSD is highly influenced by the presence of AH‐N, as indicated by a significant negative relationship.