NDLI: 15N tracing study to understand the N supply associated with organic amendments in a vineyard soil

Content Provider	Springer Nature Link
Author	Cheng, Yi Zhang, Jin Bo Müller, Christoph Wang, Shen Qiang
Copyright Year	2015
Abstract	Organic materials with low C/N ratio, such as animal manure and compost, have been largely applied to orchard soil to maintain soil organic matter and improve soil fertility. However, little is known about the decomposition characteristics and nitrogen (N) mineralization of added organic materials. Thus, a laboratory incubation study using 15N tracing technique was carried out to investigate the effects of organic materials with low C/N ratio (rapeseed meal and chicken manure) on gross N transformations in a vineyard soil. Our result showed that carbon (C) mineralization of organic material depended on C/N ratio and lignin/N ratio of organic material, while N mineralization was associated with substrate N concentration. The application of organic material with low C/N ratio increased gross N mineralization, NH4 + immobilization, autotrophic nitrification rates, and CO2, N2O, and NO emissions. Heterotrophic nitrification and NO3 − immobilization did not occur, irrespective of organic material amendments. Organic material amendments increased more total inorganic N production (mineralization + heterotrophic nitrification) than total inorganic N consumption (immobilization of NH4 + and NO3 −), leading to increasing net N mineralization rates. In addition, NO3 − consumption (NO3 − immobilization + dissimilatory NO3 − reduction to NH4 +) increased to a lesser extent than NO3 − production (heterotrophic + autotrophic nitrification) following organic material amendments, leading to more rapid accumulation of NO3 − in soils. Our results suggest that organic material with a low C/N ratio can provide readily available N as N fertilizers but accompanied by enhanced risk of N losses through gaseous N emissions and possibly NO3 − leaching and runoff.
Starting Page	983
Ending Page	993
Page Count	11
File Format	PDF
ISSN	01782762
Journal	Biology and Fertility of Soils
Volume Number	51
Issue Number	8
e-ISSN	14320789
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2015-08-09
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Gross N mineralization Organic material 15N Vineyard soil CO2 and N2O emissions Agriculture Soil Science & Conservation
Content Type	Text
Resource Type	Article
Subject	Agronomy and Crop Science Soil Science Microbiology

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