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Biological Processes and Soil Fertility (Paperback, Softcover reprint of the original 1st ed. 1984)
Loot Price: R1,510
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Biological Processes and Soil Fertility (Paperback, Softcover reprint of the original 1st ed. 1984)
Series: Developments in Plant and Soil Sciences, 11
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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."
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