Academic literature on the topic 'Broad-acre development'

Canola tolerant to the triazine group of herbicides is grown widely in Australian broad-acre cropping systems. Triazine-tolerant (TT) cultivars are known to have a yield and oil content penalty compared with non-TT cultivars. This study was designed to elucidate the crop physiological basis for the yield differences between the two types. Two commercial cultivars, near-isogenic for the TT trait, were compared in a detailed growth analysis in the field, and 22 crops were compared for phenology and crop attributes at maturity. In the growth analysis study, the TT trait was found to lower radiation use efficiency, which carried through to less biomass at maturity. There were minimal effects on leaf area development and harvest index, and no effect on canopy radiation extinction. Across the 22 crops, where yield varied from 240 to 3400 kg/ha in the non-TT cultivar, yield was on average 26% less in the TT cultivar due to less biomass produced, as there was no significant effect on harvest index. The difference in oil content (2-5%) was greater in low oil content environments. Flowering was delayed by 2-10 days with a greater delay being in later flowering environments. Quantification of the physiological attributes of TT canola allows the assessment of the productivity of different cultivar types across environments.

This paper originates from an address at the 8th International Symposium on Nitrogen Fixation with Non-Legumes, Sydney, NSW, December 2000 Detailed studies in field experiments have shown repeatedly that the transfer of 15N2 fixed by diazotrophic bacteria to wheat tissue is minimal. Here, a simple and convenient laboratory co-culture model was designed to assess important features of the association between Azospirillum brasilense and wheat, such as the rate of nitrogen fixation (acetylene reduction), ammonia excretion from the bacterium and the transfer of newly fixed 15N2 from the associative diazotroph to the shoot tissue of wheat plants. After 70 h, in this model, insignificant amounts of newly fixed N2 were transferred from an ammonia-excreting strain of A. brasilense to the shoot tissue of wheat. However, when malate was added to the co-culture the 15N enrichment of the shoot tissue increased 48-fold, indicating that 20% of shoot N had been derived from N2 fixation. Thus, the inability of the host plant to release carbon in the rhizosphere is a significant constraint in the development of associative N2-fixing systems. These specific results suggest that wheat plants with an increased release of photosynthate to the rhizosphere should be a priority for the future development of broad-acre agricultural systems that are more self-sufficient for nitrogen nutrition. The simplicity of the model for assessing the critical parameters of associative 15N2 fixation may allow large-scale surveys of plant–bacterial interactions to be conducted and a selection of improved associations for further study.

PurposeThe study examined policy improvement and cassava attractiveness. The purpose was to determine the optimum rewards using three strategies: selling of farm produce to harvesters, making wholesale of harvested outputs and retailing harvested outputs.Design/methodology/approachThree hundred and sixty (360) cassava farmers were surveyed in three local government areas in Edo South senatorial district of Nigeria. From their responses, probabilities were assigned to rewards for each strategy from each of the locations. Subsequently, dynamic programming was employed in data analysis. Specifically, Howard policy improvement technique was used to forecast expected rewards to cassava farmers in the three local government areas using the three strategies.FindingsCassava farmers in Edo South senatorial district of Edo state, Nigeria, can maximize their earnings from cassava by retailing at the local markets in Oredo and Egor local government areas and by making wholesales at Ikpoba Okha local government area. Using this policy, they will realize approximately N2360 per basin and approximately N33040 per plot of 100 × 100 ft. This will translate to N143724 per acre (4.35 plots of 100 ft2).Research limitations/implicationsAvailability of storage facilities as well as technical constraints to cassava production.Social implicationsProvision of jobs to the unemployed, thereby reducing the level of unemployment in the country.Originality/valueSuggestion of the sales strategy that will yield optimum returns to cassava farmers, using policy iteration technique, and the projected estimates of the likely turnover when the strategy is adopted. This is a point of departure from previous studies. Thus, the study used operations research methodology to model solutions, through involvement in agriculture, to Nigeria's economic/financial problems, thus making it unique. In broad terms the study demonstrates that investment in agriculture will help to reduce unemployment and enhance the country's national income.

This study aimed to evaluate the beverage quality of Coffea canephora genotypes in different environments of the western Amazon to assist plant selection and new cultivar development. To analyze beverage quality, samples of cherry coffee beans were collected separately for each genotype from clonal competition trials installed in the municipalities of Ouro Preto do Oeste, Alta Floresta do Oeste, Porto Velho, and Ariquemes in Rondônia State and Rio Branco in Acre State (Brazil). The beverage quality was assessed using the Robusta Cupping Protocol, which attribute to each genotype a score in a range from 0 to 100, highlighting nuances. Analysis of variance and principal components using reference points were used to quantify genotype x environment interaction (G x E). The analysis of variance indicated that genotypic and G x E interaction effects were significant (p < 0.01). By using a centroid dispersion method, we could identify four clones of low, eight of specific (to favorable or unfavorable environments), and seven of broad adaptability to the environments. The clones BRS 2314, 11, and 17 had average quality scores above 80 in all environments, with potential for specialty coffee production. The clones BRS 1216, BRS 3220, and BRS 3193 presented unstable behavior, with beans of higher quality in some of the evaluated environments. Such inconsistency in clone behavior is caused by unpredictable changes in plant performance in different environments. Our results indicate that both genotypic (clones) and G x E interaction effects are important for the expression of coffee beverage quality. However, the clones BRS 3213, BRS 3210, and BRS 2299 had less prominent nuances, with lower potential for specialty coffee production.

Abstract The forest classification and mapping system currently used in managing the Tongass National Forest (NF) is based largely on an economic forest measure, net board foot volume per acre. Although useful for timber economic modeling, this forest measure poorly differentiates old-growth forest types in a way that is meaningful to ecological and social concerns. In 2005, we published an article presenting a proposed tree size and tree density mapping model for the Tongass NF. We claimed the model would provide better information on the structural patterns in old-growth forests than did the current mapping models based on net board foot volume per acre. We also stated that further testing of our proposed model is required before it can be fully integrated into forest management plans and landscape analysis. In this article, we used independent field data to evaluate our proposed tree size and density model and better define its accuracy. Results showed differences among mapping classes similar to differences observed in the development stages of the model. Results also showed mapping accuracy estimates between 60 and 80%. We used the model in a forest management application by comparing the representation of old-growth forest types within a landscape to the representation within a management-defined subset of that landscape.

Abstract The downside risk of crop production affects the entire supply chain of the agricultural industry nationally and globally. This also has a profound impact on food security, and thus livelihoods, in many parts of the world. The advent of high temporal, spatial and spectral resolution remote sensing platforms, specifically during the last 5 years, and the advancement in software pipelines and cloud computing have resulted in the collating, analysing and application of ‘BIG DATA’ systems, especially in agriculture. Furthermore, the application of traditional and novel computational and machine learning approaches is assisting in resolving complex interactions, to reveal components of ecophysiological systems that were previously deemed either ‘too difficult’ to solve or ‘unseen’. In this review, digital technologies encompass mathematical, computational, proximal and remote sensing technologies. Here, we review the current state of digital technologies and their application in broad-acre cropping systems globally and in Australia. More specifically, we discuss the advances in (i) remote sensing platforms, (ii) machine learning approaches to discriminate between crops and (iii) the prediction of crop phenological stages from both sensing and crop simulation systems for major Australian winter crops. An integrated solution is proposed to allow accurate development, validation and scalability of predictive tools for crop phenology mapping at within-field scales, across extensive cropping areas.

This thesis contends that; in mainstream rural residential development around the Australian Capital Territory, use of community title guidelines for sub-division should consider social processes and environmental considerations along-side economic imperatives and interactions. Community title is a form of land tenure that allows for private freehold ownership of land as well as community owned land within the one sub-division. In New South Wales, community title was introduced in 1990 under the Community Land Development Act 1989 (NSW) and the Community Land Management Act 1989 (NSW). Since the introduction of community title, upwards of one hundred and fifty developments, ranging from just a few blocks to the size of small suburbs, have been approved throughout the state. The original aim of community title was to provide a legal framework that underpinned theme-based broad-acre development. Themebased development could include a Permaculture© village, a rural retreat for likeminded equine enthusiasts, or even a medieval village. Community title is also seen as an expedient form of land tenure for both developers and shire councils. Under community title, a developer only has to submit a single development application for a multi-stage development. This can significantly reduce a developer's exposure to risk. From a shire council's perspective, common land and resources within a development, which would otherwise revert to council responsibility for management, becomes the collective responsibility of all the land owners within the development, effectively obviating council from any responsibility for management of that land. Community title is also being touted in planning and policy as a way of achieving 'sustainable' environmental management in new subdivisions. The apparent expediency of community title has meant that development under these guidelines has very quickly moved beyond theme-based development into mainstream rural residential development. Community title effectively provides a framework for participatory governance of these developments. The rules governing a community title development are set out in the management statement, which is submitted to the local council and the state government with the development application. A community association, which includes all lot owners, manages the development. Unless written into the original development application, the council has no role in the management of the common land and resources. This thesis looks at the peri-urban zone around one of Australia's fastest growing cities - Canberra, whose population growth and relative affluence is impacting on rural residential activity in the shires surrounding the Australian Capital Territory. Yarrowlumla Shire, immediately adjacent to the ACT, has experienced a 362 percent increase in population since 1971. Much of this growth has been in the form of rural residential or hobby farm development. Since 1990, about fifteen percent of the development in Yarrowlumla Shire has been community title. The Yass Shire, to the north of the ACT, has shown a forty five percent population increase since 1971. Community title in that shire has accounted for over fifty percent of development since 1990. The thesis case study is set in Yass Shire. The major research question addressed in the thesis is; does community title, within the context of rural residential development around the Australian Capital Territory, facilitate community-based environmental management and education? Subsidiary questions are; what are the issues in and around rural residential developments within the context of the study, who are the stakeholders and what role do they play and; what skills and support are required to facilitate community-based environmental management and education within the context of the study area? To answer the research questions I undertook an interpretive case study, using ethnographic methods, of rural residential development near the village of Murrumbateman in the Yass Shire, thirty kilometres north of Canberra. At the time of the study, which was undertaken in 1996, the developments involved had been established for about four years. The case study revealed that, as a result of stakeholders and residents not being prepared for the management implications of community title, un-necessary conflict was created between residents and between residents and stakeholders. Community-based environmental management issues were not considered until these issues of conflict were addressed and residents had spent enough time in the estates to familiarise themselves with their environment and with each other. Once residents realised that decisions made by the community association could affect them, there developed a desire to participate in the process of management. Eventually, earlier obstacles were overcome and a sense of community began to develop through involvement in the community association. As residents became more involved, the benefits of having ownership of the community association began to emerge. However, this research found that management of a broad acre rural residential development under community title was far more complicated than any of the stakeholders, or any but the most legally minded residents, were prepared for.