NDLI: Fate and recovery of 15N derived from grass/clover residues when incorporated into a soil and cropped with spring or winter wheat for two succeeding seasons

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Biology and Fertility of Soils : Volume 25, Issue 1, May 1997

Biology and Fertility of Soils : Volume 24

Fate and recovery of 15N derived from grass/clover residues when incorporated into a soil and cropped with spring or winter wheat for two succeeding seasons

Content Provider	Springer Nature Link
Author	Haynes, R. J.
Copyright Year	1997
Abstract	The fate of N when 15N-labelled perennial ryegrass/white clover residues were incorporated into field lysimeters (rate equivalent to 150kgNha–1) and two successive crops of winter or spring wheat were grown was investigated. Loss of 15N over the first winter amounted to 23% and 22% respectively for winter and spring wheat and corresponding losses in the 2nd year were 10% and 14%. Both winter- and spring-sown crops recovered about 10% of residue 15N in the first season and about 1.5% in the second. The percentage of total crop N uptake originating from residue 15N was only 14% and 12% respectively for winter and spring wheat in the first season and 2.5% and 1.9% respectively for the second season. The bulk of the 15N recovered was incorporated into the soil organic matter fraction and at harvest of the 2nd year 55% of added 15N was present as soil organic N. In order to investigate the nature of this soil organic 15N, soil was fractionated into different particle size separates. Both 14N and 15N were concentrated in the medium and fine silt and coarse, and to a lesser extent, medium and fine clay fractions. However, in spring of the first season, 15N was preferentially present in the floating organic matter and to a lesser extent sand-sized fractions (i.e. as particles of decomposing residue). Between then and harvest of the second season there was a redistribution of 15N from these fractions and the medium- and fine-sized clay particles toward the coarse and medium silt-sized fractions. This suggested a movement of 15N toward more aromatic humified material in silt-sized fractions and away from decomposing organic material in sand separates and away from labile organic material in the clay-sized fractions. A laboratory incubation experiment showed that the availability (percentage mineralization) of recently immobilized 15N was greater than that of native soil 14N.
Starting Page	130
Ending Page	135
Page Count	6
File Format	PDF
ISSN	01782762
Journal	Biology and Fertility of Soils
Volume Number	25
Issue Number	2
e-ISSN	14320789
Language	English
Publisher	Springer-Verlag
Publisher Date	1997-08-05
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Content Type	Text
Resource Type	Article
Subject	Agronomy and Crop Science Soil Science Microbiology

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Fate and recovery of 15N derived from grass/clover residues when incorporated into a soil and cropped with spring or winter wheat for two succeeding seasons

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