Browsing by Author "Bull, JK"

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Economic analysis of RSD control strategies : final report SRDC project BS101S
(BSES, 1995) Croft, BJ; Page, JR; Bull, JK; Beattie, RN
The aim of this study was to compare the economics of the existing RSD control strategy in Australia of disease-free seed and disinfecting harvesters with breeding cultivars resistant to RSD. Analysis presented in this paper show that an effective disease-free seed scheme is economically the best RSD control strategy. Cultivar resistance would only be attractive if disease-free seed ceased to be a viable option.
Genotype selection and management strategies for exploitation of responses to high planting densities : SRDC final report BS137S
(1999) Bull, JK; Bull, TA
The objectives of this project were to: evaluate the potential for high density planting (close row spacings) to increase yields over a range of conditions; assess the genetic potential available to exploit higher planting density in the current breeding population; examine alternate row spacing strategies suited to grower farming systems and constraints (including irrigated and dry land); assess the potential ratoon yields from close row crops (by hand harvesting); encourage grower interest and participation in longer term activities to develop procedures and equipment to support close row management systems; analyse the economic cost/benefit from adopting higher planting density.
Genotype X environment interaction for clones and crosses planted in Southern Queensland and Northern New South Wales : SRDC final report BS15S
(1997) Bull, JK
The main aims of this project were to assess whether original seedling families produced for south Queensland would be suitable for the New South Wales sugar industry and to determine whether clones selected at the Bundaberg Sugar Experiment Station would perform similarly under northern New South Wales cropping conditions.
Selection of superior crosses of sugarcane : SRDC final report BS6S
(1991) Bull, JK; Hogarth, DM
The impact of GxE interaction on the response to three methods of selection was assessed over three locations and three crop-years. The three selection methods considered were two previously used procedures, mass (individual) selection using a visual appraisal of clonal performance and family selection using selection rate, and a new procedure, family selection using a grade based on weighed family plots. Within the two forms of family selection, light mass selection based on a visual appraisal of clonal performance was used to reject the poorest clones. The gains from selection, calculated as the deviation in performance of the select groups from the performance of a group of randomly chosen clones, were assessed for each of these three methods.
The environmental basis for clone by environment interaction : SRDC final report BSS76
(2004) Bull, JK; Bull, TA; Cooper, M
This project attempted to identify environmental factors responsible for genotype-by-environment (GXE) interaction by monitoring environmental parameters and relating these to growth responses of test clones. It also sought to identify a set of probe genotypes to use in clonal assessment trials to assist in the assessment of the performance of test clones when presented with specific environmental challenges.