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Please use this identifier to cite or link to this item: http://hdl.handle.net/10400.5/2634

Title: Estimating the effect on nitrogen mineralization from organic residues applied to degraded soils
Authors: Cordovil, C.
Teixeira, T.
Keywords: organic residues
nitrogen mineralization
degraded soils
Issue Date: Sep-2010
Publisher: Cordovil, C. e Ferreira, L.
Abstract: Nitrogen (N) is the nutrient most likely to be limiting for plant and animal production. Also, increasing world population, is giving rise to the need for more food production, in quantity and quality enough to supply man’s needs. It is therefore necessary to supply more and more nutrients to the soil in order to achieve the production levels required to reduce world hunger. Intensive and somewhat indiscriminate use of commercial fertilizers is not environmentally sustainable, and excessive application of N, as mineral fertilizers, may lead to many environmental problems such as nitrate pollution of water resources, amongst others. Simultaneously, intensification of agriculture, as well as the development of industry, has been leading to the increasing production of organic residues such as manure, municipal solid waste, crop and forest waste, food industry waste, among others (Sims, 1995). Their application to agricultural land is a good solution for recycling, can increase soil organic matter content, and to provide plant nutrients such as N, as a good alternative to commercial fertilizers (Cordovil, 2004). The application of organic residues to agricultural soils as a source of N needs a better understanding of the processes involving the mineralization of organic N compounds. A good prediction of the amounts of N mineralized from the residues is an interesting issue, and also a valuable tool for the sustainable and rational use of these sources of nutrients for plant growth, while reducing the environmental impact. More than 90% of the N in soils is in organic forms. Available N is considered to be a fraction of easily mineralizable organic N that can be estimated based on the mineral N released during incubation of soil at an appropriate temperature. However, incubation procedures are time consuming, and several chemical methods have been developed as substitutes for incubations by several authors. Thus, the development of a rapid, accurate and cost-effective method for the prediction of N supply both from soil organic matter and the application of organic waste materials is of great interest
Description: RAMIRAN International Conference
URI: http://hdl.handle.net/10400.5/2634
ISBN: 978-972-8669-47-8
Appears in Collections:DQAA - Comunicações em Actas de Conferências

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