基于GIS的典型白浆土区八五三农场耕地地力的定量评价

以黑龙江省典型白浆土区的853农场为例,采集农田耕层(0～20cm)样品1695个,以土地利用现状图的耕地图斑为评价单元,选取10个指标,利用特尔菲法和层次分析法,结合GIS技术,对853农场耕地地力进行了定量化的分析和评价.评价结果表明八五三农场耕地地力整体水平为:三级地占总耕地面积的35.47％,其次为二级和四级,分别占27.53％和20.86％,比例最小的是一级和五级地,分别占6.83％和9.30％.分级结果较好的体现了地区特点,同时明确了不同等级耕地的面积、空间分布格局,为探讨制定科学的培肥政策、提高作物产量和土壤基础地力,保护生态环境提供了定量化的分析依据.     

Production risk and technical inefficiency in Russian agriculture

This study investigates production risk and technical inefficiencyas two possible sources of the production variability that characterisedRussian agriculture during the last decade. The empirical analysisis conducted using panel data from 1996 to 2001 on 443 largeagricultural enterprises from three regions in central, southernand Volga Russia. A production function specification accountingfor the effect of inputs on both risk and technical inefficiencyis found to describe production technologies of Russian farmsmore appropriately than the traditional stochastic frontierformulation.     

The contribution of UK farm assurance schemes towards desirable environmental policy outcomes

This study sought to evaluate the content of a range of UK primary production assurance schemes and their potential to support selected desirable agri-environmental policy outcomes. The schemes reviewed included those that fall under the Assured Food Standards umbrella plus eligible UK equivalents and examples of retailer and supplementary schemes. The assessment was based on scheme documentation (2008/2009), associated published literature and historical comment. The analysis showed that assurance schemes, generally, do not meet all the desired policy outcomes but this should not necessarily be expected or sought. However, such schemes are ideally placed to help the industry respond to changing demands, by changing or raising the scheme standards.     

Soil,water and crop management alternatives in rainfed agriculture in the Sahel: an economic analysis

Most agriculture in the Sahel Region is carried out under rainfed conditions where low and uncertain soil moisture levels limit productivity. Improved soil, water and crop management practices are required to reverse the steady decline in per capita food production and sustain output over the long term. Several technological innovations and related farm management practices are evaluated in a case study of a typical farm in Mali. Through use of a soil-water balance model and a whole-farm economic model an optimal mix of these measures is identified. Compared to a base case where no modern inputs are utilized, the combination of animal traction (oxen team), low levels of NPK fertilizer, tied-ridges, traditional long-season food grain crops and early planting was most effective: food grain output was 35% higher than with the traditional base case; soil erosion was reduced by 72%; and even with residual future soil erosion damage capitalized into current income, net farm income was larger by a factor of almost 45.     

Harnessing sustainability,resilience and productivity through conservation agriculture: the case of likoti in Lesotho

Subsistence farmers in Lesotho have been able to boost agricultural yields and increase food production by adopting conservation agriculture. The practice, locally known as likoti, also contributes to combating soil erosion and to enhancing fertility. The socio-economic and environmental benefits help poor households to rehabilitate and strengthen their livelihood capital base and ultimately help rural communities to build system resilience in the face of widespread poverty and increasing vulnerability that affect the country. This paper discusses the major advantages associated with the spread of likoti. By drawing on primary data collected by FAO-Lesotho, it enquires into the determinants of adoption, thereby highlighting constraints and options for future up-scaling. The results show that attending appropriate training is a crucial prerequisite for the correct adoption of likoti. However, training is more effective when trainers pursue true participation and when social capital among farmers is stronger. Further important determinants of adoption are the level of education and the economic incentives provided to vulnerable households. Stronger policy and institutional support in all these areas would thus help address the cultural and resource constraints that limit the full potential of likoti to be harnessed and ultimately hinder its further spread throughout the country.     

Farm work, off-farm work, and hired farm labour: estimating a discrete-choice model of French farm couples' labour decisions

We model jointly several types of discrete-choice labour decisionsof farm couples: farm work, off-farm work and hired farm labour.Rather than estimating a set of reduced-form participation equationsthat is subject to an internal inconsistency problem, we estimatea 16-choice multinomial model. We find that farm labour of operatorsand of spouses are substitutes. Hired farm labour increaseswith the farmer's qualifications, perhaps substituting for thecouple's labour inputs. Other adults in the household substitutefor the farm labour input of the farm couple and hired workers.We find that the organisation of work by French farm householdshas changed over time, in the direction of a more equal sharingof tasks and responsibilities between members of the farm family.     

On Crop Biodiversity, Risk Exposure, and Food Security in the Highlands of Ethiopia

This paper investigates the effects of crop genetic diversity on farm productivity and production risk in the highlands of Ethiopia. Using a moment-based approach, the analysis uses a stochastic production function capturing mean, variance, and skewness effects. Welfare implications of diversity are evaluated using a certainty equivalent, measured as expected income minus a risk premium (reflecting the cost of risk). We find that the effect of diversity on skewness dominates its effect on variance, meaning that diversity reduces the cost of risk. The analysis also shows that the beneficial effects of diversity become of greater value in degraded land.     

Building knowledge systems for sustainable agriculture: supporting private advisors to adequately address sustainable farm management in regular service contacts

Advisory service provisioning on sustainability issues such as environmental care and food safety is considered suboptimal in privatized extension systems, which comprise a diverse set of private advisors. Apart from funding dedicated ‘public good’ projects, government also relies on these advisors to address sustainability issues in their regular service contacts with farmers. Policy measures have hence been proposed to stimulate farmer demand for such sustainable farm management (SFM) advice (pull measures) and to build capacity among advisors (push measures). This paper assesses two interventions, in nutrient management and mastitis prevention, that integrate pull measures (awareness building and economic incentives) and push measures (promoting facilitative advisory styles and optimizing knowledge system linkages) to stimulate advisory service provisioning on SFM. Results indicate that effectiveness appears to depend on an adequate mix of, and balance between, push and pull measures. Awareness building is a prerequisite to creating demand for such services and appears more important than economic incentives. However, awareness is not built by the interventions alone; indeed, a lack of awareness may not be the main problem: the broader institutional context may not be conducive to a proactive approach to addressing SFM if regulatory frameworks are unclear and inconsistent. The main conclusion is that, despite interventions having an impact, it is uncertain whether the demand for, and supply of, SFM advice will be sustained after interventions are withdrawn.     

Valuation of environmental and social functions of the multifunctional Cypriot agriculture

The multifunctional farming sector in Cyprus poses threats on the island’s water resources, but highly contributes to the protection of the cultural identity and to the provision of incomes and employment in its rural areas. These services are externalities, as farmers are not remunerated in markets for the environmental and cultural services they provide, nor for the fact that they maintain vivid rural areas. This paper presents an application of the Choice Experiment method, in order to evaluate these non-traded outputs of Cypriot agriculture. The results of the empirical analysis demonstrate that the Cypriot public is in favor of a less intensive pattern of agriculture. Furthermore, Cypriots are willing to pay in order to mitigate adverse environmental effects of agriculture, to improve cultural heritage and to safeguard the continuation of farming trade on the island. The estimated benefits often exceed income losses from changes in the cropping pattern towards extensification, which verifies that EU rural development policies are regarded as beneficial by the public.     

基于GIS的农用土地增产潜力研究--以济南市长清区为例

利用GIS技术和遥感技术,按照“机制法”原理计算济南市长清区土地资源生产潜力;重点是因地制宜、科学确定并计算土壤有效系数和社会有效系数,从而得到土地生产潜力和社会生产潜力的像元分布数据,在此基础上,进行粮食增产潜力问题的研究。     

The value of plant genetic diversity to resource-poor farmers in Nepal and Vietnam

Genetic resources for food and agriculture are the biological basis of world food and nutrition security; and they directly or indirectly support the livelihoods of over 2.5 billion people. Genetic diversity gives a species or a population the ability to adapt to changing environments. For resource-poor farmers, adaptive animal breeds, crop varieties and cultivars adapted to particular micro-niches, stresses or uses are the main resources available to maintain or increase production and provide a secure livelihood. The economic value of genetic diversity for productivity and yield traits is discussed in the literature. However, it is difficult to value many other aspects of agricultural biodiversity as these have both direct and indirect values in terms of qualitative traits such as food, nutrition and environmental uses that include adaptation to low input conditions, co-adaptive complexes, yield stability and the consequent reduction of risk, specific niche adaptation, and in meeting socio-cultural needs. Together, the direct and indirect values of genetic resources for resource-poor farmers are expressed in a range of options in the form of the crop varieties and species they use for managing changing environments.

The value of genetic diversity to resource-poor farmers is seldom captured by markets or addressed by the international research agenda. This paper presents lessons learned from our work over 5–10 years in the Asia and Pacific Ocean (APO) region on participatory crop improvement, home gardens and on-farm management of agricultural biodiversity. The lessons illustrate how farmers adapt genetic resources to suit local environmental conditions. The paper focuses on the value of genetic diversity of selected crop species to meet people's food and other needs. Genetic diversity valued by resource-poor farmers is often maintained, selected and exchanged by local social seed networks. Identification of such genetic resources and their custodians is important if international agricultural research is to contribute to the reduction of poverty. The paper highlights some good practices from case studies that illustrate how such genetic resources could be exploited by informal research and development strategies or participatory plant breeding or for marketing value-added products.     

Cooperatives, regulation and competition in Norwegian agriculture

This article analyses the efficiency of current market regulations and market structure in Norwegian agriculture. Based on their potential to coordinate farmers' supplies, large marketing cooperatives are assigned a market regulation role. However, market prices frequently tend to fall below target prices, spurring costly additional market regulations. This is not necessarily a result of inefficient coordination by the cooperative. Using a mixed market model, the study shows that over production may be explained by the competition between marketing cooperatives and investor-owned wholesalers (IOW), typically weakening the cooperatives' ability to coordinate market supply. This conclusion is robust over a variety of IOW contracts. However, to what extent competition is to blame, depends on the target price level and the contract structure of the IOW. Moreover, it is shown that current market interventions to remove excess supplies may induce further incentives to increase production.     

Farmer responses to changing risk aversion,enterprise variability and resource endowments

The focus of this article is on assessing how risk aversion, enterprise variability and resource endowments affect farm land‐use decisions and economic returns. A theoretical model of a two‐enterprise, two‐constraint farm is developed, and then, an empirical illustration for an Australian farm is provided. The methodology used builds on previous expected mean‐variance (EV) models by incorporating land and budget constraints. The Kuhn–Tucker conditions of the EV model are examined to highlight that changes in resource endowments have larger effects on economic returns, than do changes in risk aversion or enterprise gross margin variability. It was also found that combinations of enterprise mixes that do not use all available resources can produce higher economic returns, relative to some enterprise mixes that use all available resources.     

Discourse and practice of participatory flood risk management in Belfast,UK

The introduction of the Floods Directive signals a move from flood protection towards flood risk management in the European Union. Public participation is highlighted in the Floods Directive as being instrumental to effective implementation of this new approach. This study utilised document analysis, non-participant observation, a questionnaire survey, and interviews to evaluate the discourse and practice of participation in the implementation of the Floods Directive in Belfast, United Kingdom. Flood risk management processes in Belfast are found to be high on participatory rhetoric but low on meaningful engagement. The participatory process is lacking in transparency, does not encourage the active participation of interested parties and has not been clearly communicated to key publics. Opportunities to increase meaningful public participation in the process remain underutilised, and the establishment of local flood forums has provided little opportunity for meaningful engagement. Some actions of governance agencies could be best characterised as facilitating the responsibilisation of risk and are designed to manage risk to agencies rather than address flooding issues.     

Simultaneous estimation of work choices and the level of farm activity using panel data

We analyse the simultaneous determination and evolution overtime of work choices and the level of farm activity, using apanel of Israeli farm households. We estimate jointly a multinomialchoice model of work activity and an endogenous switching regressionof farm size, accounting for unobserved heterogeneity and correctingfor simultaneity bias. Our results imply that some family farmstend to expand over time and specialise in farming, whereasother farm households downsize their farming operation and increasetheir engagement in the off-farm labour market. Therefore, thesize distribution of farms is converging towards a bimodal distribution.