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Nitrogen‐15 Recovery and Release by Rye and Crimson Clover Cover Crops
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Nitrogen‐15 Recovery and Release by Rye and Crimson Clover Cover Crops
Nitrogen‐15 Recovery and Release by Rye and Crimson Clover Cover Crops
Noah N. Ranells
Noah N. Ranells
MW
Michael G. Wagger
Michael G. Wagger
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1 May 1997
journal article
Published by
Wiley
in
Soil Science Society of America Journal
Vol. 61
(3)
,
943-948
https://doi.org/10.2136/sssaj1997.03615995006100030033x
Abstract
A grass-legume biculture may be preferred over a legume monoculture cover crop due to the scavenging ability of a grass species, especially when high residual soil N levels are present following summer droughts in the Atlantic Coastal Plain. Rye (
Secale cereale
L.) and crimson clover (
Trifolium incarnatum
L.) were grown in monoculture and as a biculture in a 2-yr field experiment on a Typic Kandiudult to assess cover crop recovery of fertilizer
15
N and the subsequent corn (
Zea mays
L.) uptake of cover crop residue
15
N. Potassium nitrate labeled with 10 atom %
15
N was applied to microplots at 50 kg N ha
-1
1 wk after seeding the cover crops, which were monitored for recovery of fertilizer
15
N. Labeled residue was placed in a new microplot to monitor release of residue
15
N and its recovery by corn. Averaged across both years, rye monoculture recovered 39% of the labeled
15
N fertilizer compared with 19% in the rye-crimson clover biculture and 4% in the crimson clover monoculture. Following corn harvest and averaged across both years, total recovery of
15
N fertilizer from the original microplots (cover crop, corn biomass, and soil N) was 29% for crimson clover, 75% for rye, 55% for rye-crimson clover biculture, and 20% for the native winter weeds. In 1993, corn recovery of residue
15
N was lowest in the rye monoculture (4%) compared with other treatments (20–35%). Results indicated that a rye-crimson clover biculture was capable of recovering greater residual
15
N than a crimson clover monoculture, but less than rye monoculture. Copyright © . Soil Science Society of America .
Keywords
RYE
CRIMSON CLOVER
RECOVERY
COVER CROP
BICULTURE
CLOVER MONOCULTURE
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Cited by 46 articles