Nutrient budgets on organic farms: a review of published

This report was presented at the UK Organic Research 2002 Conference. On organic farms it is important that a balance between inputs and outputs of nutrients is achieved. This paper collates nutrient budgets collated at the farm scale for 88 farms in 9 temperate countries. The majority of budgets were compiled for dairy farms (56). All the nitrogen budgets showed an N surplus (average 83 kg N ha-1 year-1). The phosphorus (P) and potassium (K) budgets showed both surpluses and deficits (average 3.4 kg P ha-1 year-1; 13.7 kg K ha-1 year-1). For all nutrients as nutrient inputs increased the surplus increased more significantly than the nutrient outputs. Overall, the data illustrate the diversity of management systems in place on organic farms, which consequently lead to significant variability in nutrient use efficiency and potential nutrient sustainability between farms. There are opportunities for almost all organic farmers to improve the efficiency of nutrient cycling on the farm and increase short-term productivity and long-term sustainability

Nutrient cycling on organic farms

This paper examines the sustainability of nutrient cycling on organic farms. After a brief consideration of the principles of nutrient cycling in organic agriculture, data on soil P and K indices and farm nutrient budgets is used to assess the integrity of nutrient cycling, including some consideration of losses to the environment. An attempt is made to assess the wider sustainability of organic farming in the context of the limited amount of recycling possible

Development of software to plan conversion to organic production (OrgPlan)

This report was presented at the UK Organic Research 2002 Conference. OrgPlan is a computer programme aimed at farmers and advisors assisting with the planning of an organic conversion. The programme is divided into technical modules, supported by a standard enterprise database, a report builder and an advisory section. Through the farm profile builder, rotation, cropping and livestock planner, conversion scenarios over several years can be developed and are evaluated for technical and financial feasibility by calculating farm gate budgets for key resources (forage energy and key nutrients) and financial reports (cash flow budget and profit and loss account). The poster illustrates the basic functioning of the software as well as the underlying rationale for the scenario evaluation

The neglect of northern England’s Neolithic and Early Bronze Age structures in the archaeological literature of Britain

For many years, it has been noted, from my own personal observations and from literature referring to the Neolithic and Early Bronze Age (N/EBA) structures in northern England, that there has been a neglect in referencing these sites. Nevertheless, there are numerous impressive monuments and landscapes in northern England. These include seventy Cumbrian stone circles, 1500 Bronze Age barrows in Yorkshire, amazing Northumbrian rock art, and henge and cursus complexes, as well as Neolithic round and long mounds in North Yorkshire. The earliest antiquarians were fascinated by southern Britain’s prehistoric structures. They have assumed that these monuments are the best and the most interesting examples or type-sites in Britain. Although northern sites have provided early dates and new archaeological material and information, many British archaeologists have not referenced these structures. In fact, even in books and articles about northern England’s prehistoric structures, the author(s) often provide comparisons of structures within southern Britain, rather than presenting their data in its own right or comparing it with another site elsewhere. While the Wessex and Orkney monuments are awe-inspiring, some of their sites have been under continual scrutiny, investigation and constant publication, with some archaeologists unable to see the magnificence beyond. Despite many references to this disparity, for example, Barclay (2001, 13) or Harding (2013, 1-2), the situation continues. In fact, this issue has been unresolved for forty years (Miket 1976, 113). This thesis was therefore undertaken to see whether this could or could not be proven, by analysing various syntheses from a national perspective. Books written about the Neolithic and Early Bronze Age, with Britain in the title, would be studied. The variety and complexity of northern England’s structures within their N/EBA landscapes will be discussed ideas will be offered for future research

Numerical simulation of CO2 storage in saline aquifers

CO2 capture and storage (CCS) has been proposed as a climate change mitigation strategy. The basic principle is to prevent CO2 which would normally be emitted from large point sources, such as power stations, from entering the atmosphere. This is achieved by capturing the CO2 at source and storing it in a location where it will be trapped and unable to enter the atmosphere. This work looks specifically at geological storage of CO2 in deep saline formations. Dynamic simulations can be used to investigate the fundamental physical and chemical processes which occur when CO2 is injected into geological formations. They can also be used to determine the suitability of a particular site for CO2 storage. The scale of the processes being simulated is important when building a dynamic model. Here dynamic simulations have been used to explore three different aspects of geological CO2 storage in deep saline formations. The first model investigates large scale CO2 migration and pressure build up at a potential CCS site. The second model concentrates on the small scale processes of CO2 dissolution and convection. The third model attempts to accurately model both the large scale processes of CO2 injection and migration and the small scale processes of CO2 dissolution and convection. Dynamic simulations have been used to model storage capacity, CO2 migration and pressure buildup at a potential CO2 storage site in the UK North Sea. There are large uncertainties in the input data so various models have been run using a range of parameters. The primary control on pressure buildup at the site is the permeability of the unit directly beneath it. The plume diameter is primarily controlled by the porosity and permeability of the reservoir unit. Despite uncertainties in the input data, the use of a full three-dimensional (3D) numerical simulation has been extremely useful for identifying and prioritizing factors that need further investigation. Dissolution of CO2 into existing formation waters (brine) leads to an increase in brine density proportional to the amount of dissolved CO2. This can lead to gravitational instabilities and the formation of convection currents. Convection currents, in turn, will increase CO2 dissolution rates by removing CO2 saturated brine from the CO2-brine interface. The dissolution and subsequent convection of CO2 which has leaked through a fracture is investigated using dynamic simulations. The instigation of convection currents due to flow through a fracture increases dissolution rates. Comparison of our results with fracture flow rates shows that for typical fracture apertures dissolution from a fracture is small relative to the amount of CO2 flowing through the fracture. Two phase flow effects and the currents caused by an advancing plume of injected CO2 can affect patterns of CO2 dissolution and convection within a reservoir. Most existing models of CO2 dissolution and convection use a static boundary layer or do not involve two phase flow effects. A radial, two phase, two component model has been built to model the injection process along with convection enhanced dissolution. The model performs well compared to analytical solutions in terms of the large scale processes of CO2 migration and pressure buildup but modelled convection is highly dependent on grid resolution. Numerical instabilities are also present. Further work is needed to increase the accuracy of the model in order to allow higher resolution modelling to be carried out and modelling of the smaller scale processes to be improved

'A local habitation and a name A Kristevan reading of human growth in religion, with a reference to John and Charles Wesley'

This study is concerned with the concept of human growth and change: it juxtaposes processes of growth and change in psychoanalytic therapy and those in a religious context. In both situations the relationship between growth and development and the idea of becoming 'good' is considered. Kleinian, Post-Kleinian and particularly Kristevan theory is used to elucidate facilitators of change in psychoanalytic therapy and in the context of Christian faith. The emphases in the theory used here differ from those of more traditional developmental theorists in the study of religion, which rely heavily on ego-psychology and self-psychology, and focus on the autonomous ego and the degree of maturity of forms of religion. By contrast, the emphases here are on the split self, on unconscious drives, phantasies and affects, and on the non-cognitive apprehension of truth. Through an examination of the lives of John and Charles Wesley, the thesis examines the possibility of growth occurring in the context of so-called 'immature’ forms of religion, the means by which this might occur, and the extent to which change is governed by an individual's mental structure and psychological defences. The Kristevan reading allows a less cognitive, 'ego-driven' study of the growth to 'goodness' than does that of the developmental theorists. It thus questions the validity of traditional classifications of forms of religion. It elicits differences between the historical subjects, which demonstrate the importance of personality factors in facilitating or hindering growth. Finally, it enables an exploration of Charles Wesley’s hymns which reveals evidence of erotic and imaginary elements, and the possibility of triadic openness in what some would see as an 'immature' form of belief. This examination also questions Kristeva's own assertion that religious symbolism cannot adequately 'sublimate' the 'abject'