Premium
Oat and Rye Root Decomposition Effects on Nitrogen Mineralization
Author(s) -
Malpassi R. N.,
Kaspar T. C.,
Parkin T. B.,
Cambardella C. A.,
Nubel N. A.
Publication year - 2000
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/sssaj2000.641208x
Subject(s) - mineralization (soil science) , secale , chemistry , agronomy , avena , cover crop , calcareous , soil respiration , organic matter , nitrogen cycle , nitrogen , decomposition , respiration , botany , biology , organic chemistry
Decomposition and mineralization of cover crop roots needs to be understood to determine if N taken up by cover crops is mineralized during main crop growth. Two experiments were conducted in a controlled environment to measure decomposition of oat ( Avena sativa L. ‘Ogle’) and rye ( Secale cereale L. ‘Rymin’) root residues and to examine its effect on soil N mineralization. In the first, oat and rye roots were mixed with soil and in the second, roots were grown in situ. At 7, 14, 28, 56, 84, and 112 d after the start of decomposition, denitrification, soil NO − 3 , and soil NH + 4 were measured to determine net mineralized N. Soil respiration and C and N contained in roots and coarse soil organic matter were measured to determine decomposition. All treatments in both experiments showed an increase in net mineralized N during the first 56 d. After 56 d, net mineralized N in the control remained relatively constant, whereas mineral N continued to accumulate in the treatments with root residues. Net N mineralization of the rye and oat root treatments did not differ. Roots mixed with soil had high respiration rates during the first 3 d and there were no differences between oat and rye root treatments. In the roots in situ experiment, however, respiration peaked for oat roots at Day 12 and for rye roots at Day 33. The oat treatment also had less C and N remaining in roots and coarse organic matter throughout the experiment. Even though oat roots decomposed faster than the rye roots, we predict that <55% of the N contained in the roots of a spring‐killed oat or rye cover crop will become available to the following crop.