Knowledge and experiences for the development of sustainable silvopastoral systems in heathlands in Asturias. PDF Download
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Author: Raquel Benavides Calvo
Publisher: Univ Santiago de Compostela
ISBN:
Category :
Languages : en
Pages : 253
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Author: J.G.W. Jones
Publisher: Springer Science & Business Media
ISBN: 9781851665105
Category : Technology & Engineering
Languages : en
Pages : 394
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Biological and physiological systems: animal sciences. Plant-animal interactions in northern temperate sown grasslands and semi-natural vegetation. Exploitation of the systems approach in technical design of agricultural enterprises. Application of systems theory to farm planning and control: modelling resource allocation. Optimising the mixture of enterprises in a farming system. Farming systems research-extension. Food policy and food security planning: institutional approaches to modelling grain markets and food security in Sub-Saharn Africa. A systems view of commercial supply and marketing links. Agroecosystems. Understanding and managing changes in agriculture. Agricultural sector modelling for policy development. Of agricultural systems and systems agriculture: systems methodologies in agricultural education. Extension education: Top(s) Down, Bottom(s) Up and Other Things.
Author: Raquel Benavides Calvo
Publisher: Univ Santiago de Compostela
ISBN:
Category :
Languages : en
Pages : 253
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Author: Malcolm Bell
Publisher:
ISBN:
Category : Nature
Languages : en
Pages : 172
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Author: O Paladines
Publisher: CIAT
ISBN: 9789589183427
Category : Technology & Engineering
Languages : en
Pages : 260
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Author:
Publisher: Academic Press
ISBN: 0080567088
Category : Science
Languages : en
Pages : 425
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Book Description
The six articles in this issue of Advances in Ecological Research cover a wide spectrum of ecology to ecology to munities, the discussion of vegetation change on a longer time scale, and the significance of conservation, especially in the industrialized world.S.J. Hall and D.G. Raff provide something of interest to all ecologists. Several common themes are presented in this volume including the dynamics of communities with such examples as Glacier Bat and Mount St.Helens.* SPECIAL FEATURES:* Lively selection of review on topical subjects.
Author: Jan P. Janssen
Publisher: Springer Science & Business Media
ISBN: 9400922558
Category : Science
Languages : en
Pages : 392
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Author: J. Tinsley
Publisher: Springer Science & Business Media
ISBN: 9400961014
Category : Nature
Languages : en
Pages : 409
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The success of shifting cultivation systems developed by subsistence farmers testifies to the resilience of the "natural" soil-plant ecosystems to recover from the offtake of nutrients in crops and loss of soil struc ture. By contrast, the development of intensive cropping systems requires large inputs especially of nitrogen, together with phosphorus, sulphur and other essential elements in order to maintain the nutrient levels needed for abundant crop yields. As Dr. Cooke ably pointed out in his introductory lecture, the dis coveries and experiments of the 19th century encouraged farmers in temperate zones to rely greatly on chemical fertilizers supplements. However, the work of Charles Da{win on soil mixing by earthworms and the discovery by Hellriegel and Wilfarth in 1886 that the nodules on legume roots contain colonies of symbiotic bacteria able to "capture" atmospheric nitrogen molecules to the benefit of the host plant heralded a growing realization of the importance of soil biota in fertility studies. Biological fixation of nitrogen has been the theme of many meetings and publi~ations hitherto but at this Conference, convened on the delightful campus of Reading University, attention was mainly focussed on other biological processes in soil fertility. These Proceedings record the dominant themes and include six keynote addresses delivered at plenary sessions and seven introductory lectures to paper reading sessions by invited individuals plus 22 of the proferred papers, in six sections as tabled in the contents list.
Author:
Publisher:
ISBN:
Category : Forest management
Languages : en
Pages : 602
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Author: Hill Farming Research Organisation
Publisher:
ISBN:
Category : Animal nutrition
Languages : en
Pages : 200
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Author: Macaulay Land Use Research Institute
Publisher:
ISBN:
Category : Animal nutrition
Languages : en
Pages : 96
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