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1. Interactions in the Root Environment — An Integrated Approach : Proceedings of the Millenium Conference on Rhizosphere Interactions, IACR-Rothamsted, United Kingdom 10– April, 2001

Author

David S. Powlson, Geoff L. Bateman, Keith G. Davies, John L. Gaunt, Penny R. Hirsch, Peter W. Barlow, David S. Powlson, Geoff L. Bateman, Keith G. Davies, John L. Gaunt, Penny R. Hirsch, and Peter W. Barlow

Subjects
Botany, Soil science, Microbiology, Plant physiology
Abstract

This volume contains a selection of papers presented at the Rothamsted Millennium Conference'Interactions in the Root Environment - an Integrated Approach'. The meeting brought together scientists from a range of disciplines interested in the relationship between soil biology and plant growth, reflected by the contents of the volume. Topics range from root development and nutrient flow, plant-microbe and plant-plant signaling, methods for studying bacterial and fungal diversity, to the exploitation of rhizosphere interactions for biological control of diseases and soil remediation. Authors include many internationally-recognized experts in their field and the contributions range from reviews to research papers. The volume presents a timely and wide-ranging overview of the interactions between plants, microbes and soil. It should prove an indispensable resource for students and others seeking an introduction to the topic, in addition to scientists already conversant with the area of research.

Published
2012

2. Distribution of nitrogen pools in the soil profile of undisturbed and reseeded grasslands

Author

Keith Goulding, John L. Gaunt, Daniel Murphy, Mark Shepherd, Anne Bhogal, S. C. Jarvis, D. J. Hatch, and S. Fortune

Subjects
Soluble organic nitrogen, Topsoil, Chemistry, Cultivation, Soil Science, Soil classification, potentially mineralisable nitrogen, Soil type, Microbiology, Grassland, mineral nitrogen, Agronomy, Loam, Soil water, Soil horizon, Gleysol, Agronomy and Crop Science, Nitrogen cycle
Abstract

This study evaluated the effect of cultivation and reseeding on the distribution and fate of soil mineral N (SMN), soluble organic N (SON) and potentially mineralisable N (PMN) in the soil profile of two long-term grasslands in the UK. Cultivation and reseeding significantly increased the total soluble N concentration (SMN plus SON) of the soil profile (0–90 cm), with over 50 mg SON kg–1 observed. By contrast, the PMN pool was unaffected by cultivation and declined with increasing soil depth. The flush in SON and SMN observed in both soils disappeared within 1 year following cultivation. The fate of SON appeared to be dependent on soil type, with considerably more movement to deeper layers apparent in the profile of a silty clay loam (30% clay) than in a clay loam (49% clay). Mineralisation and/or immobilisation of SON in the topsoil probably accounted for the changes observed in the SON content of the clay loam. SON is an important N pool in grassland soils and cultivation has a significant impact on its release. Measurements of SON should therefore be included in studies of N cycling in agricultural cropping systems, so that full account may be taken of its potential as a source or sink of mobile N.

Published
2000

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