Please use this identifier to cite or link to this item:
Title: The Physical Properties of Mixtures of A and B Horizons and Evaluation of Profile Mixing for Management of Trangie Red-Brown Earth
Contributor(s): Hollingsworth, Ian Douglas (author); Cass, Alf (supervisor); McLeod, Don (supervisor)
Conferred Date: 1989
Copyright Date: 1989
Open Access: Yes
Handle Link:
Abstract: Conventional methods of seedbed preparation have caused crop yields to decline on red–brown earths. This yield decline is attributed to reduced physical fertility brought about by the collapse of soil structure. Regeneration of favourable structure may be achieved by several means, one of which is mixing of subsoil with topsoil. Deep mouldboard tillage, which mixes A and B horizon soil, has increased cotton yield on some irrigated red–brown earths in the Lower Macquarie Valley of New South Wales. The beneficial effect of deep mouldboard ploughing may be enhanced by gypsum application. Deep mouldboard tillage loosens the topsoil to approximately 400 mm and changes the texture of the plough layer by mixing clay subsoil with loam topsoil. However, the physical basis for the yield response to deep mouldboard tillage has not been thoroughly investigated. The morphology, particle size distribution and clay mineralogy of a red–brown earth on the Agricultural Research Centre, Trangie, N.S.W., indicates that it is prone to structural degradation when used for irrigated cultivation. The aim of this study is to quantify the compaction constraints to soil physical fertility of the Trangie red–brown earth and to determine the likely beneficial effects of deep mouldboard tillage. The results of an investigation of the penetration resistance, soil water and oxygen transmission properties affecting the physical fertility of Trangie red–brown earth soil as a function of compaction and soil horizon mixing is reported in this thesis. The effect of gypsum application on soil penetration resistance is also reported.
Publication Type: Thesis Masters Research
Rights Statement: Copyright 1989 - Ian Douglas Hollingsworth
HERDC Category Description: T1 Thesis - Masters Degree by Research
Statistics to Oct 2018: Visitors: 291
Views: 220
Downloads: 76
Appears in Collections:Thesis Masters Research

Files in This Item:
9 files
File Description SizeFormat 
open/SOURCE05.pdfThesis, part 24.41 MBAdobe PDF
Download Adobe
open/SOURCE06.pdfThesis, part 3774.43 kBAdobe PDF
Download Adobe
open/SOURCE03.pdfAbstract767.56 kBAdobe PDF
Download Adobe
open/SOURCE04.pdfThesis, part 13.78 MBAdobe PDF
Download Adobe
1 2 Next
Show full item record

Page view(s)

checked on Dec 29, 2018


checked on Dec 29, 2018
Google Media

Google ScholarTM


Items in Research UNE are protected by copyright, with all rights reserved, unless otherwise indicated.