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ISBN:
Category :
Languages : en
Pages : 6

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Author: G. Catroux
Publisher: Springer Science & Business Media
ISBN: 9400979304
Category : Technology & Engineering
Languages : en
Pages : 258

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The agricultural value of sewage sludges is well known and a lot of published data has demonstrated the positive effects of sludge appli cations on plant growth and yield. These effects are probably due mainly to the nitrogen and phosphorus content of sewage sludges. But, as sludges are more organic than mineral, we can expect an effect of the organic matter added to the soil on soil fertility. Certainly, in the future, landspreading of sludges will be regulated, taking into account pollution hazards for waters (excess of nitrogen and phosphorus supply compared to plant needs and soil storage capacities) and for soils (excess of heavy metals supply and build up in soils). There will be regulations fixing what low level of sludges may be spread each year, decreasing their comparative value with respect to mineral fertilizers. In this eventuality, the organic value of sludges will take on a greater importance and several questions arise : - what is the lowest amount of sludge to be spread to have an immediate effect on soil physical properties? - are sludges effective on soil physical properties when spreading repeated low amounts? On the other hand, organic matter and soil biology are closely linked and there are few data on the possible effects - beneficial or detrimenta- on soil organisms.

Author: Luke Gatiboni
Publisher: Frontiers Media SA
ISBN: 2889663574
Category : Science
Languages : en
Pages : 140

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Author:
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ISBN:
Category : No-tillage
Languages : en
Pages : 100

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Author: Katarina Börling
Publisher:
ISBN: 9789157664662
Category :
Languages : en
Pages : 39

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Author: Y. Chen
Publisher: Springer Science & Business Media
ISBN: 9400944268
Category : Technology & Engineering
Languages : en
Pages : 312

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The use of organic residues as a means of maintaining and increasing soil fertility is of long-standing. This tradition has been somewhat neglected since the introduc tion of mineral fertilizers at low cost. More and more farmers and scientists are now showing renewed interest in the proper and effective use of org~tnic residues, composts and other recycled organic additives. The role and function of organic amendments in modern agricultural systems have become topics of major interest in the scientific and agricultural communities. Research work on residue disposal has provided new concepts on the interaction between organic components and soils as well as new handling technologies (e. g. pelletizing of organic residues). The trend to conserve energy has led scientists to study the minimal tillage system, to find ways of replacing conventional inorganic fertilizers with natural organic prod ucts or microbial preparations, and to develop new composting methods. The drive to achieve higher yields in commercial greenhouse farming has led to a search for optimum substrates as growth media and for improved management techniques. This has led to the introduction of organic substitutes for peat, nota bly those originating from agricultural wastes. Another important aspect is the current interest in organic farming, where use of synthetic chemicals is avoided or prohibited. An increasing percentage of the population in highly developed countries is willing to pay premium prices for food produced on soils where inorganic fertilizers and other agricultural chemicals have not been used.

Author: Christian Schaum
Publisher: IWA Publishing
ISBN: 1780408358
Category : Science
Languages : en
Pages : 592

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This comprehensive book provides an up-to-date and international approach that addresses the Motivations, Technologies and Assessment of the Elimination and Recovery of Phosphorus from Wastewater. This book is part of the Integrated Environmental Technology Series.

Author: G. Hucker
Publisher: Springer
ISBN: 9027703175
Category : Science
Languages : en
Pages : 456

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Proceedings of the EEC Seminar Organized jointly by the CEC and the Institute for Soil Fertility, Haren (Gr) and held in Groningen, The Netherlands, June 12-13, 1980

Author:
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ISBN:
Category : Water-supply
Languages : en
Pages : 100

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Author:
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ISBN:
Category : Agricultural chemistry
Languages : en
Pages : 384

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