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https://hdl.handle.net/1959.11/16222
Title: | Soil Physical Effects of Stubble Retention on Early Crop Growth | Contributor(s): | Regar, Arthur Frans Cesar (author); Lockwood, Peter (supervisor); MacLeod, D (supervisor) | Conferred Date: | 1996 | Copyright Date: | 1994 | Open Access: | Yes | Handle Link: | https://hdl.handle.net/1959.11/16222 | Abstract: | The early growth of crops is often affected by stubble retention and no-tillage. This study was conducted to determine if soil physical properties, in particular soil temperature differences under no-tillage stubble retained and burned, could explain differences in early growth of two contrasting crops such as wheat and soybean, which were grown in different locations and seasons. No-tillage fallow with no soil disturbance except at sowing and complete chemical fallow for weed control (NT); no-tillage fallow with no soil disturbance except at sowing, complete chemical fallow, and with stubble burned (NB); same as NB, but with artificial stubble at a low intensity (S1); and same as NB, but with artificial stubble at a high intensity (S2) were tested to determine the influence of soil temperature on early growth of wheat at the Douglas McMaster Research Farm, Warialda (black cracking clay) and on early growth of soybean at the University of New England Research Station, Laureldale (chocolate soil).The treatments allow shading and insulating effects to be separated from other effects such as soil N deficiency, phytotoxicity, or plant diseases which were usually found in the conservation tillage systems. The relationship between dry matter and average soil temperature at 65 DAS (12 to 65 days after sowing) in the Warialda experiment was the only result where dry matter was increased (by 220 kg ha⁻¹ °C⁻¹). The difference between soil temperatures in the NT and NB treatments was 0.36 °C, which would give a predicted dry matter difference of 75 kg ha⁻¹, which is close to the measured difference of 53 kg ha⁻¹. There is no such effect for other treatments derived from the relationship between dry matter and any measurement of soil temperature for both experiments. | Publication Type: | Thesis Masters Research | Rights Statement: | Copyright 1994 - Arthur Frans Cesar Regar | HERDC Category Description: | T1 Thesis - Masters Degree by Research |
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Appears in Collections: | Thesis Masters Research |
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File | Description | Size | Format | |
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open/SOURCE03.pdf | Abstract | 443.67 kB | Adobe PDF Download Adobe | View/Open |
open/SOURCE04.pdf | Thesis | 4.09 MB | Adobe PDF Download Adobe | View/Open |
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