Eriksen, J. (2002) Organic manures as sources of fertiliser sulphur. In: International Fertiliser Society Proceedings (505), pp. 1-19.
On a global scale, S excretion from domestic animals may be estimated to around 8 million t per year, corresponding to 80% of the World S consumption for mineral fertiliser manufacture. The utilisation of this potential source of fertiliser-S is discussed focusing on the use of manure from housing and manure storages applied to agricultural land. Especially in the developed countries the S content of manure collected from cattle and pigs (1 million t S per year) has a potential as S-fertiliser, as legal demands on the utilisation of manure N and/or P already require the use of animal wastes as fertilisers. Content and composition of manure-S from both monogastrics and ruminants may be extremely variable, depending on the S content of the feed. If the diet has an S content balanced according to the animal requirement then the S content of the manure will be relatively low and the main part of S is expected to be in organic forms not available to plants. If the manure is stored under anaerobic conditions over a time span of months there is considerable risk of microbial transformations of sulphate into organic S and gaseous compounds that may be lost by volatilisation. In this situation the plant-availability in the year of application may be too low to be taken into account in fertiliser practice. A residual long-term effect of the organic S fraction must be expected. The ability of a cropping system to use mineralised S depends on the length of the growing season of the crops, but mineralisation is unlikely to fully meet the S-demand of a crop. There is a need for quantitative investigations of the relations between dietary S input, loss during storage and plant utilisation in the field.
|EPrint Type:||Conference paper, poster, etc.|
|Type of presentation:||Paper|
|Subjects:||Soil > Nutrient turnover|
|Research affiliation:||Denmark > DARCOF II (2000-2005) > I.10 (VegCatch) Organic vegetable cultivation methods and use of catch crops|
|Deposited By:||Eriksen, Senior scientist Jørgen|
|Deposited On:||30 Sep 2003|
|Last Modified:||12 Apr 2010 07:28|
|Document Language:||Danish - Dansk|
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