Upland crop technologies in Cambodia: economic evaluations and some adoption issues

Agricultural research and development (R&D) has being conducted in the upland districts of Cambodia to develop new farming systems and crop management technologies. Levels of farm income in these areas are relatively low due to small farm sizes and low crop productivity. Work is also planned to encourage the process of adoption of these technologies, and here we investigate how this process can be facilitated. A literature review identifies two important technology characteristics, ‘relative advantage’ and ‘trialability’, for successful adoption. Minimum or target rates of return on investment in new technologies are discussed as a means of investigating how much improvement in relative advantage might be enough to encourage successful adoption of the technology. A number of economic assessments of new crop methodologies in Cambodian upland districts and farming systems are presented. Some technologies show an encouraging return on investment from the viewpoint of the Cambodian farmer – rhizobium inoculation of soybean seed had an indicated return of up to 600% on the investment depending on the cost to the grower. Other issues are also likely to be important in discussing change to farming systems, for instance social issues in the village/community context. We present a proposal for a participatory learning process in which economic and social issues are highlighted, to encourage adoption of new crop technologies in local Cambodian contexts.New technology, adoption, upland crops, Cambodia, economic assessment, social, Crop Production/Industries, Institutional and Behavioral Economics, Research and Development/Tech Change/Emerging Technologies,

Changes in Management Can Improve Returns from Cambodian Upland Crops

Farming systems research for wet-season non-rice upland crops in Cambodia is being conducted with the overall aim of poverty reduction and food security for farmers in the Provinces of Battambang and Kampong Cham. Some of these cash crops exhibit low and variable incomes, especially when grown in the early wet season. Cambodian farmers may borrow money to buy crop inputs and often sell their produce to companies and traders from neighbouring countries, hence they are price takers. Some new crop technologies are evaluated which relate to soil and crop fertility management interacting with climatic factors. The DSSAT crop simulation model is used to predict outcomes from alternative management strategies. Bio-economic analyses are conducted to assess the likely appeal of these technologies to Cambodian farmers in a return-on-investment context. The results show that management to adjust the nitrogen fertility available to corn, the use of rhizobium in soybean, and a delay in planting early-wet-season corn may all show substantial financial benefits. Further research and an associated farmer demonstration program involving local extension officers are recommended.Upland crops, Cambodia, technology, economics, simulation, risk, Crop Production/Industries,

The WISH pond: potential for development of aquaculture in northeast Cambodia

In Cambodia, fish provide a major source of animal protein for rural households. Capture fisheries have declined and aquaculture has been identified as playing an important role in food and nutritional security and rural income generation. In 2011, WorldFish, in partnership with the Stung Treng Fishery Administration Cantonment and the Culture and Environment Preservation Association, aimed at improving the uptake of small-scale aquaculture by communities with limited experience in fish culture in Stung Treng Province in northeast Cambodia. The system was given the name “WISH ponds,” derived from the combination of the words "water" and "fish" to reflect the integration of fish cultivation with water for storage and vegetable growing. It was targeted towards households with limited space to construct large aquaculture ponds, such as peri-urban households. The study indicated that WISH ponds can create an important learning platform for communities to address challenges associated with small-scale aquaculture development by using scientific data generated and owned by the participants. Results from this 2011 study provided important insights into the challenges and constraints for introducing small-scale aquaculture into rural households in Cambodia. In mid-2013, WorldFish won a Feed the Future Partnering for Innovation grant, funded by the United States Agency for International Development, to build upon its successful engagement with communities in northeast Cambodia where WISH ponds had already been introduced and investigate scaling this technology to establish more WISH ponds in these communities

Allele-Specific Isothermal Amplification Method Using Unmodified Self-Stabilizing Competitive Primers.

Rapid and specific detection of single nucleotide polymorphisms (SNPs) related to drug resistance in infectious diseases is crucial for accurate prognostics, therapeutics and disease management at point-of-care. Here, we present a novel amplification method and provide universal guidelines for the detection of SNPs at isothermal conditions. This method, called USS-sbLAMP, consists of SNP-based loop-mediated isothermal amplification (sbLAMP) primers and unmodified self-stabilizing (USS) competitive primers that robustly delay or prevent unspecific amplification. Both sets of primers are incorporated into the same reaction mixture, but always targeting different alleles; one set specific to the wild type allele and the other to the mutant allele. The mechanism of action relies on thermodynamically favored hybridization of totally complementary primers, enabling allele-specific amplification. We successfully validate our method by detecting SNPs, C580Y and Y493H, in the Plasmodium falciparum kelch 13 gene that are responsible for resistance to artemisinin-based combination therapies currently used globally in the treatment of malaria. USS-sbLAMP primers can efficiently discriminate between SNPs with high sensitivity (limit of detection of 5 × 101 copies per reaction), efficiency, specificity and rapidness (<35 min) with the capability of quantitative measurements for point-of-care diagnosis, treatment guidance, and epidemiological reporting of drug-resistance

What is a Green Economy? Review of National-Level Green Economy Policies in Cambodia and Lao PDR

A green economy that simultaneously promotes environmental sustainability, social inclusiveness, and economic growth is expected to benefit the heavily resource-dependent least developed countries. Yet, internationally, there is very little empirically based research on how the “green development” agenda translates into natural resource management policies in the least developed countries. This paper examines the implementation of green economy policies at the national level in the energy and forestry sectors in the Lao PDR and Cambodia. Both countries have adopted green growth targets; however, in terms of natural resources management, two contradictory processes have taken place during the past decade. While there have been some initiatives to decentralize natural resource management by enhancing the role of local communities role, such as community-based forest or fishery management, the far greater trend has been the opening up of the economies of the Lao PDR and Cambodia to large-scale investments by multinational enterprises. Large-scale hydropower projects and increasing deforestation pose challenges to more sustainable natural resource management efforts. This article is based on an analysis of the national green economy strategies and expert interviews with the government, academia, private sector and international and national development organizations. Focusing on the energy and forestry sectors, but also analysing the national green economy strategies as a whole, our analysis sheds light on the choices made in the national development versus green economy strategies. While green economy thinking rests on strong state regulation, the policies are often formulated within a complex dynamic of donor and investor interests. The achievement of a green economy depends on the state; thus, it should steer investments to ecologically less harmful industries and ensure social inclusiveness in land-use decisions. Our results show, however, that implementing a green economy is far more complex. Despite the quest for synergies, at the sectoral level there are still many unaddressed trade-offs between, for example, energy sources and forms of land use

What is a Green Economy? Review of National-Level Green Economy Policies in Cambodia and Lao PDR

A green economy that simultaneously promotes environmental sustainability, social inclusiveness, and economic growth is expected to benefit the heavily resource-dependent least developed countries. Yet, internationally, there is very little empirically based research on how the “green development” agenda translates into natural resource management policies in the least developed countries. This paper examines the implementation of green economy policies at the national level in the energy and forestry sectors in the Lao PDR and Cambodia. Both countries have adopted green growth targets; however, in terms of natural resources management, two contradictory processes have taken place during the past decade. While there have been some initiatives to decentralize natural resource management by enhancing the role of local communities role, such as community-based forest or fishery management, the far greater trend has been the opening up of the economies of the Lao PDR and Cambodia to large-scale investments by multinational enterprises. Large-scale hydropower projects and increasing deforestation pose challenges to more sustainable natural resource management efforts. This article is based on an analysis of the national green economy strategies and expert interviews with the government, academia, private sector and international and national development organizations. Focusing on the energy and forestry sectors, but also analysing the national green economy strategies as a whole, our analysis sheds light on the choices made in the national development versus green economy strategies. While green economy thinking rests on strong state regulation, the policies are often formulated within a complex dynamic of donor and investor interests. The achievement of a green economy depends on the state; thus, it should steer investments to ecologically less harmful industries and ensure social inclusiveness in land-use decisions. Our results show, however, that implementing a green economy is far more complex. Despite the quest for synergies, at the sectoral level there are still many unaddressed trade-offs between, for example, energy sources and forms of land use

Modélisation sous Abaqus de la fermeture de fissures courtes dans un acier inoxydable 304L

La connaissance précise du comportement d'une fissure courte est nécessaire pour comprendre la propagation des fissures de faïençage thermique dans les structures nucléaires. La présente étude porte sur l'influence, sur les cinétiques de propagation, de la fermeture induite par plasticité. Une approche numérique sous Abaqus, en 3D, avec un front de fissure droit ou courbe permet de retrouver des résultats expérimentaux mettant en évidence des vitesses de propagation supérieures pour des fissures courtes

Intestinal P-glycoprotein exports endocannabinoids to prevent inflammation and maintain homeostasis

Neutrophil influx into the intestinal lumen is a critical response to infectious agents, but is also associated with severe intestinal damage observed in idiopathic inflammatory bowel disease. The chemoattractant hepoxilin A3, an eicosanoid secreted from intestinal epithelial cells by the apically restricted efflux pump multidrug resistance protein 2 (MRP2), mediates this neutrophil influx. Information about a possible counterbalance pathway that could signal the lack of or resolution of an apical inflammatory signal, however, has yet to be described. We now report a system with such hallmarks. Specifically, we identify endocannabinoids as the first known endogenous substrates of the apically restricted multidrug resistance transporter P-glycoprotein (P-gp) and reveal a mechanism, which we believe is novel, for endocannabinoid secretion into the intestinal lumen. Knockdown or inhibition of P-gp reduced luminal secretion levels of N-acyl ethanolamine-type endocannabinoids, which correlated with increased neutrophil transmigration in vitro and in vivo. Additionally, loss of CB2, the peripheral cannabinoid receptor, led to increased pathology and neutrophil influx in models of acute intestinal inflammation. These results define a key role for epithelial cells in balancing the constitutive secretion of antiinflammatory lipids with the stimulated secretion of proinflammatory lipids via surface efflux pumps in order to control neutrophil infiltration into the intestinal lumen and maintain homeostasis in the healthy intestine