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| Topp, C F E; Watson, C A; Rees, R M; Stockdale, E A. |
| A balanced use of resources within organic farming systems is required to maintain sustainable systems. Hence, it is essential to have tools that can assess the use of resources within the farming system and their impact on the environment. The range of tools that have been developed include those assessing local farm-scale issues together with those that assess impacts at the global scale. At the global scale assessments are usually made on the basis of a unit of product whereas at the local scale assessments can also be made on an area basis. In addition, the tools also assess a variety of issues, e.g. biodiversity, pollution potential, energy and water use. The level of detail required for the different assessment tools differs substantially;... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Environmental aspects Production systems Production systems Recycling; Balancing and resource management Air and water emissions. |
| Ano: 2006 |
URL: http://orgprints.org/10162/1/Energy_and_environmental_burdens_of_organic_and_non%2Dorganic_agriculture_and_horticulture.pdf |
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| Walker, R L; Watson, C A; Rees, R M; Stockdale, E A. |
| Phosphorus (P) is an essential plant nutrient that needs to be managed carefully in organic systems so that crop yield and quality remain sustainable without contributing to environmental damage, particularly that associated with eutrophication. Under organic regulations, minimally processed rock phosphate (PR) can be used to amend low P fertility soils, although the solubility is extremely low at optimum soil pH for most crop growth (pH 6.5). This paper describes a project (PLINK) which aims to develop methods of improving P efficiency on organic farms, although the same approaches may also be applicable on conventional and low-input farms. The methodologies that the project is developing include the fermentation and composting of crop waste material with... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Nutrient turnover; Air and water emissions; Composting and manuring. |
| Ano: 2006 |
URL: http://orgprints.org/10260/1/Improving_supply_and_phosphorus_use_efficiency_in_organic_farming_systems.pdf |
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| Fortune, S; Robinson, J S; Watson, C A; Philipps, L; Conway, J S; Stockdale, E A. |
| Effective use and recycling of manures together with occasional and judicious use of supplementary fertilizing materials forms the basis for management of phosphorus (P) and potassium (K) within organic farming systems. Replicated field trials were established at three sites across the UK to compare the supply of P and K to grass–clover swards cut for silage from a range of fertilizing materials, and to assess the usefulness of routine soil tests for P and K in organic farming systems. None of the fertilizing materials (farmyard manure, rock phosphate, Kali vinasse, volcanic tuff) significantly increased silage yields, nor was P offtake increased. However, farmyard manure and Kali vinasse proved effective sources of K to grass and clover in the short to... |
| Tipo: Journal paper |
Palavras-chave: Nutrient turnover; "Organics" in general; Soil; Farming Systems; Farm nutrient management. |
| Ano: 2005 |
URL: http://orgprints.org/7702/1/ref_paper_LP_Journal_Soil_Use.pdf |
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