Ensiling of Manured Crops—Does Repeated Spreading of Slurry Increase the Hygienic Risk?
✍ Scribed by Rammer, Chri; Lingvall, Per; Salomon, Eva
- Publisher
- John Wiley and Sons
- Year
- 1997
- Tongue
- English
- Weight
- 182 KB
- Volume
- 73
- Category
- Article
- ISSN
- 0022-5142
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✦ Synopsis
The inÑuence of cattle slurry applied to a silage crop was studied in three successive years. Each year, 40 t slurry ha~1 were applied in two equal applications. Unfertilised and mineral-fertilised Ðeld plots were used as controls. Before spreading, the slurry was contaminated with spores of Clostridium tyrobutyricum (103È104 g~1 FM). The Ðelds were harvested two times a year, the yields were measured and the chemical composition and bacterial content of the crop were determined. The fresh material was chopped, ensiled without additives, and stored for 100 days before opening. The bacterial content of the soil surface and available N, P and K in soil were measured. Slurry did not seem to have any signiÐcance in a short-term perspective. Yield increase as an e †ect of slurry application was slight and inconsistent in comparison with the yield from unfertilised plots. The number of Clostridium or Bacillus spores in the soil surface was not signiÐcantly a †ected by the slurry application, nor was the number of deterimental organisms in harvested crop at ensiling. Nonetheless, in three of the four silages in which clostridial spores were estimated, numbers were higher in silage made from slurry-treated crops.