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Identifying the causes of soil aggregate breakdown under intensive packet salad production

Citation

Almajmaie, AHT and Hardie, M and Acuna, T and Birch, C, Identifying the causes of soil aggregate breakdown under intensive packet salad production, Proceedings of the Soil Science Australia National Soil Science Conference 2014, 23-27 November, Melbourne, Australia, pp. 1-4. (2014) [Refereed Conference Paper]

Copyright Statement

Copyright 2014 Australian Society of Soil Science Incorporated

Official URL: http://www.soilscience2014.com/proceedings/Almajma...

Abstract

Frequent cultivation, irrigation and bed forming associated with packet salad production have led to a loss in soil carbon and aggregate stability at six farms operated by Houstonís farms, Richmond, Tasmania. Soil disaggregation has resulted in poor seedling establishment, soil crusting, reduced infiltration, poor irrigation performance, and increased runoff and erosion. This paper reports initial findings from detailed assessment of aggregate stability, and soil properties across the six farms. Aggregate stability was determined by rainfall simulation, wet sieving and ultrasonic disruption of 2.0-4.75 mm aggregates pre-treated to be at either air dry moisture content (40 Co for 24 h) or field capacity (-10 kPa). Aggregate were also analysed by CSBP laboratories for a range of chemical properties and indices of structural stability. Initial results demonstrated that aggregate stability at air dried moisture content was most susceptible to disaggregation by rainfall simulation, whilst aggregates at field capacity had similar levels of aggregate stability for all three disaggregation techniques. The stability of air dried aggregates was most highly correlated with CEC-cation exchangeable capacity (positive), EPP-exchangeable potassium percentage (negative), then reactive aluminium (positive), and organic carbon (positive). Aggregate stability was however poorly correlated with cation ratio of soil structural stability (CROSS) and exchangeable sodium percentage (ESP).

Item Details

Item Type:Refereed Conference Paper
Keywords:soil crusting, erosion, aggregate stability
Research Division:Environmental Sciences
Research Group:Soil Sciences
Research Field:Land Capability and Soil Degradation
Objective Division:Environment
Objective Group:Rehabilitation of Degraded Environments
Objective Field:Rehabilitation of Degraded Farmland, Arable Cropland and Permanent Cropland Environments
Author:Almajmaie, AHT (Mr Abbas Almajmaie)
Author:Hardie, M (Mr Marcus Hardie)
Author:Acuna, T (Dr Tina Acuna)
Author:Birch, C (Associate Professor Colin Birch)
ID Code:100683
Year Published:2014
Deposited By:Tasmanian Institute of Agriculture
Deposited On:2015-05-26
Last Modified:2015-11-12
Downloads:0

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