Learning in agriculture : building social capital in island communities

Social capital helps communities respond positively to change. Research in agricultural businesses and into managing change through learning in communities has highlighted the importance of relationships between people and the formal and informal infrastructure of communities to the quality of outcomes experienced by communities, businesses and individuals. Communities can be geographic communities - the data drawn on in this paper are from an island community, for example or communities-of-common-purpose, such as agricultural organisations. This paper reviews research into managing change through learning and social capital, presents a model of the simultaneous building and use of social capital and explores the ways in which learning as part of an agricultural community can be used to bring benefits to geographic communities such as islands. The model presented in this paper stems from studies of the informal learning process that builds resilient communities. It conceptualises the way in which social capital is used and built in interactions between individuals. There are two stages to the model. The first stage depicts social capital at the micro level of one-on-one interactions where it is built and used. The second stage of the model is about the interrelationship of micro-level social capital processes with the community and societal-level social capital resources.

Application of novel technologies in water reclamation, reuse and recycle

Water reuse has become an integral element of the "total water resources planning and management" along with the other elements such as water conservation, water use efficiency and management of the allocation of existing water sources. Researchers are working actively on the following aspects of water reuse: identification and characterization of different wastewaters that could be reclaimed, development of treatment technologies and effluent standards, quantification of potential gains due to recycling and risk management. The wastewaters that can be reclaimed are domestic and industrial wastewaters, grey water, black water, stormwater and rain water and their potential reuse lies in agriculture, aquaculture, industries, non-potable use in residential and community fronts and indirect and direct potable use. The treatment of wastewater ranges from secondary treatment to advanced treatment, which produces different "Classes" of reclaimed water. This paper evaluates the current status of the research on the above-mentioned important aspects of water reuse with relevant case studies and the future demand for reuse water. The direction in which the future-reuse schemes should be formulated so that they are safe, environmentally sustainable and cost effective are also discussed.

Towards using ICT to enhance flow of information to aid farmer sustainability in Sri Lanka

Farmers need information at all stages of the farming life cycle to make optimal decisions. The required information includes not only prior knowledge but also real time (dynamic) information such as market prices and current production levels. Some valuable information needed by the farmers is produced by government organizations and is available in different locations in different formats. Although farmer is the most important stakeholder in agriculture, there has not been much effort to provide the essential information to farmers on a real time basis. This lack of information is creating many difficulties for farmers as they are not being able to make the correct decisions relating to their farming activities. Through field studies we have identified information required by farmers at various stages of the farming cycle and official sources where this information is available. Next we developed an information flow model that connects various information sources to farmers’ information needs. Based on these findings we are now developing a mobile phone based information system to deliver the required information to farmers in real time.

Potassium phosphonate alters the defence response of Xanthorrhoea australis following infection by Phytophthora cinnamomi

Potassium phosphonate (phosphite) is widely used in the management of Phytophthora diseases in agriculture, horticulture and natural environments. The Austral grass tree, Xanthorrhoea australis, a keystone species in the dry sclerophyll forests of southern Australia, is susceptible to Phytophthora cinnamomi, but is protected by applications of phosphite. We examined the effect of phosphite application on the infection of X. australis seedlings and cell suspension cultures by zoospores of P. cinnamomi. Phosphite induced more intense cellular responses to pathogen challenge and suppressed pathogen ingress in both seedlings and cell cultures. In untreated X. australis seedlings, hyphal growth was initially intercellular, became intracellular 24 h after inoculation, and by 48 h had progressed into the vascular tissue. In phosphite-treated seedlings, growth of P. cinnamomi remained intercellular and was limited to the cortex, even at 72 h after inoculation. The cell membrane retracted from the cell wall and phenolic compounds and electron dense substances were deposited around the wall of infected and neighbouring cells. Suspension cells were infected within 6 h of inoculation. Within 24 h of inoculation, untreated cells were fully colonised, had collapsed cytoplasm and died. The protoplast of phosphite-treated suspension cells collapsed within 12 h of inoculation, and phenolic material accumulated in adjacent, uninfected cells. No anatomical response to phosphite treatment was observed before infection of plant tissues, suggesting that the phosphite-associated host defence response is induced following pathogen challenge. Anatomical changes provide evidence that phosphite stimulates the host defence system to respond more effectively to pathogen invasion.

Heterotrimeric G proteins-mediated resistance to necrotrophic pathogens includes mechanisms independent of salicylic acid-, jasmonic acid/ethylene- and abscisic acid-mediated defense signaling

Heterotrimeric G proteins are involved in the defense response against necrotrophic fungi in Arabidopsis. In order to elucidate the resistance mechanisms involving heterotrimeric G proteins, we analyzed the effects of the Gβ (subunit deficiency in the mutant agb1-2 on pathogenesis-related gene expression, as well as the genetic interaction between agb1-2 and a number of mutants of established defense pathways. Gβ-mediated signaling suppresses the induction of salicylic acid (SA)-, jasmonic acid (JA)-, ethylene (ET)- and abscisic acid (ABA)-dependent genes during the initial phase of the infection with Fusarium oxysporum (up to 48 h after inoculation). However, at a later phase it enhances JA/ET-dependent genes such as PDF1.2 and PR4. Quantification of the Fusarium wilt symptoms revealed that Gβ- and SA-deficient mutants were more susceptible than wild-type plants, whereas JA- and ET-insensitive and ABA-deficient mutants demonstrated various levels of resistance. Analysis of the double mutants showed that the Gβ-mediated resistance to F. oxysporum and Alternaria brassicicola was mostly independent of all of the previously mentioned pathways. However, the progressive decay of agb1-2 mutants was compensated by coi1-21 and jin1-9 mutations, suggesting that at this stage of F. oxysporum infection Gβ acts upstream of COI1 and ATMYC2 in JA signaling.

Electrochemical and spectroscopic investigation of redox processes for labile metal dithiocarbamate complexes

Although metal dithiocarbamate complexes have been studied extensively, there is in sate cases a distinct lack of data concerning redox properties and the products thereof. This is particularly true for complexes of the late transition and main group metals which are important in agriculture, industry, and chemical analysis. Hence, using electrochemical techniques, the redox behaviour of dithiocarbamate complexes of zinc, cadmium, mercury, lead, and tellurium has been examined. The products of oxidation and reduction have also been characterized by spectroscopic techniques (NMR, EPR, UV, and IR), mass spectrometry, conductivity, and Where possible, crystallographic study of an isolated compound. The species studied were without exception labile with the result that electrochemistry at mercury electrodes was influenced by the great stability of the mercury dithiocarbamate (Hg(RR’dtc) 2) complexes. Investigation of the latter showed that oxidative processes in the presence of mercury led to a new class of expounds: polymeric mercury dithiocarbamato cations. Oily one of these could be isolated as a solid, with the formula [Hg5(RR’dtc) 8](C104)2 For R=R’=ethyl the crystal structure was determined. For other metal dithiocarbamates the electrochemical behaviour at mercury electrodes in many ways paralleled that of the mercury analogues. Thus oxidative processes involved oxidation of electrode mercury to form mixed metal cationic species. Polarographic reduction led to the metal amalgam, usually via formation of mercury dithiocarbamate. Electrochemical studies at inert electrode materials such as platinum yielded distinctly different responses, with both oxidation and reduction being more difficult. Oxidation products at platinum electrodes gave identical polarographic responses to those firm mercury electrodes due to rapid interaction of the former with electrode mercury. The results are in sharp contrast to much of the previous work on transition metal dithiocarbamates for which electrochemical redox processes are often metal based arid not explicated by interaction with the electrode material.

Measuring dairy farm performance

To fully consider production impacts, this thesis adopts a systems perspective and uses a biophysical model, DairyMod, to measure the interactions between system components and gauge the environmental impact of dairy farming arising from nitrogen use. Performance from the perspective of both the individual farmer and society is examined.

Identification and possible disease mechanisms of an under-recognized fungus, Aureobasidium pullulans

Background: Investigations into the occurrence and health effects of yeast-like fungi in the outdoor air in the US have been limited. We sought to identify a respirable-sized fungus common in the Pasadena air, locate a major source for the emissions and investigate its relevance to allergic disease. Methods: Yeast-like fungi sampled from the environment were isolated, microscopically examined and sequenced. Pasadena allergy patients were skin tested with commercially available fungal extracts. Patient serum was immunoanalyzed for specific IgE reactivity. Nearby vegetation was analyzed in a controlled emission chamber to find a major source for the aerosols. Results: Hyaline unicellular conidia comprised up to 90% (41,250 m^-3 of air) of total fungal counts and generally peaked at night and during periods of rainfall and ensuing winds throughout the fall and winter. Flowers were determined to be a major source of the emissions. The cellular and colonial morphology of isolates were consistent with Aureobasidium species. The sequence of the D1/D2 region of the 26S ribosomal subunit of isolates from flowers showed identity to two strains of Aureohasidium pullulans (black yeast). Seventeen percent (16/94) of atopic individuals had positive skin testing with A. pullulans extract. Patient sera gE identified several high molecular weight allergens in Aureobasidium extracts. Conclusions: Respirable-sized conidia of A. pullulans are emitted from flowers and form high concentrations in the air. They are associated with immediate reactivity on skin tests, bind to patient sera IgE, and might be relevant in allergic upper and lower airway diseases.

Healthy ageing: farming into the twilight

Policy directives in agriculture have long been concerned with encouraging low producing farmers to retire - with limited success. From a healthy ageing perspective, the choice to remain on the farm into advancing years could appear a desirable policy outcome. Yet as farmers age, many with little prospect of inter-generational succession, there is growing concern that some farm families are beginning to experience extraordinary isolation, reduced health and quality of life, and increasing vulnerability with seemingly no choice but to stay on the farm and soldier on. The John Richards Initiative in Aged Care in Rural Australia hosted a forum on ‘ageing farmers', where the issues of healthy ageing and the barriers to retirement were discussed from three different perspectives - the demographic and economic drivers of structural ageing in the farm sector, the cultural and identity issues underlying retirement choices of farmers and the health and well-being implications of ageing on-farm. This article brings these diverse and interdisciplinary viewpoints together to explore the challenges and options for ageing farmers, where the question may be shifting from concerns about ‘who will run the farm' to ‘who will be there to take care of me'?

Interview with Sergie Bang

Dr Sergie Bang is a Papua New Guinean who studied in Australia at the University of Western Australia in 1988-1993. He studied on an AIDAB Scholarship and completed a PhD in Agriculture. The interview is conducted in English by Dr Jonathan Ritchie of Deakin University, and Dr Musawe Sinebare of the Pacific Adventist University. This set comprises: an interview recording, a timed summary, and a photograph.

Interview with Dr. Janet Pandi

Dr. Janet Pandi is a Papua New Guinean who studied at Adelaide University in 2002-2004, and in 2014-current. She studied on an ACIAR Jon Allwright Fellowship and completed a Masters in Agriculture during her first period of study in Australia, and is working on a PhD in her second. The interview was conducted in English on 9 September 2014 by Dr. Jonathan Ritchie of Deakin University and Dr. Musawe Sinebare of Pacific Adventist University. This set comprises: an interview recording, a timed summary and a photograph.

Interview with Sugeng Prasetyo

Sugeng Prasetyo is an Indonesian who studied at the University of Melbourne in the 1980s. He studied on a Colombo Plan Scholarship and completed a Masters in Agriculture. The interview was conducted in English on 4 August 2014 by Dr. Jemma Purdey of Deakin University and Dr. Ahmad Suaedy of the Abdurrahman Wahid Centre for Inter-faith Dialogue and Peace at Universitas Indonesia. This set comprises: an interview recording, and a timed summary.

Interview with M. H. Sarjan

M. H. Sarjan is an Indonesian who studied at Adelaide University on two occasions; in 1992-1994 and in 1999-2003. On both occasions he studied on Australian Agency for International Development (AusAID) Scholarships, and he completed his Masters, then his PhD in Agriculture. He has since been involved in a number of projects, and become a professor. The interview was conducted in English on 6 August 2014 by Dr. Jemma Purdey of Deakin University. This set comprises: an interview recording, a timed summary and a photograph.