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	Provedor de dados Organic Eprints (2) Autor Rovira, Pere (2) Romamyà, Joan (1) Romanyà, Joan (1) Palavra-chave Nutrient turnover (2) Tipo do documento Conference paper, poster, etc. (1) Journal paper (1) Ano 2008 (1) 2007 (1) País Germany (2) Idioma Inglês (2)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 2 Primeira ... 1 ... Última N availability after long-term organic farming in irrigated and rain-fed Mediterranean semi-arid grassy crops Organic Eprints Romanyà, Joan; Rovira, Pere. The use of manures and rotation with legumes in organic farming systems does not always guarantee the adequate nutrient supply to crops. We studied post-harvest N availability in a series of Mediterranean semi-arid rain-fed and irrigated organic fields after 18 years of conversion and compared these with conventional fields nearby. In organic irrigated soils the use of legumes and the application of moderate amounts of manures resulted in higher amounts of soil organic C and potentially mineralisable N. In contrast, in organic rain-fed soils that did not incorporate legumes in their rotation and used low amounts of manures, soil organic C and potential mineralisable N were lower. In organic irrigated soils changes in organic matter quality resulted in a... Tipo: Conference paper, poster, etc. Palavras-chave: Nutrient turnover. Ano: 2008 URL: http://orgprints.org/11487/3/Romanya_11487_ed.doc Labile phosphorus forms in irrigated and rain-fed semiarid Mediterranean grassy crops with long-term organic and conventional farming practices. Organic Eprints Romamyà, Joan; Rovira, Pere. The availability of organic fertilisers plays a major role in organic farming systems. Such systems exclude the use of synthetic fertilisers, whilst aiming to optimise internal nutrient cycling. The low availability of manures, particularly in dry areas, can lead to negative nutrient balances inmany organic farming systems. Such negative nutrient balances are mainly found for P and K. In this paper,we aim to study the availability of P in irrigated and rainfed semiarid Mediterranean grassy crops with long-term organic and conventional farming practices. NaHCO3 extracts were prepared from an array of soils from 16 plots, covering organic and conventional management in rainfed and irrigated conditions. Inorganic (NaHCO3-Pi) and organic P (NaHCO3-Po)... Tipo: Journal paper Palavras-chave: Nutrient turnover. Ano: 2007 URL: http://orgprints.org/11486/1/Labile_phosphorus_forms_in_irrigated_and_rainfed_semiarid_Mediterranean_grassy_crops_with_long%2Dterm_organic_or_conventional_farming_practices.pdf Registros recuperados: 2 Primeira ... 1 ... Última

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