Explorative research into quality of slurry manure from dairy farms with different feeding strategies

Autor: J.W. Reijs, W.H. Meijer, Egbert A. Lantinga, E.J. Bakker
Rok vydání: 2003
Předmět:
netherlands
phytotoxicity
Plant Science
Wiskundige en Statistische Methoden - Biometris
nitrogen
Biologische bedrijfssystemen
cress lepidium-sativum
biotesten
mineralization
bioassays
herbage
deterrents
Chemistry
bio-assay
cattle manure
food and beverages
Straw
PE&RC
Germination
stikstof
melkveehouderij
N recovery
cattle slurry
animal feeding
Phytotoxicity
cattle feces
dairy farming
sewage-sludge
klavers
grass
growth
Field experiment
diervoedering
grasbestand
Development
clovers
Mathematical and Statistical Methods - Biometris
Biological Farming Systems
decomposition
fytotoxiciteit
clover
Manure
grasses
Agronomy
Slurry
Departement Dierwetenschappen
rundveedrijfmest
Animal Science and Zoology
seed-germination
herbage rejection
rundveemest
Monoculture
Agronomy and Crop Science
Department of Animal Sciences
Sludge
grassen
Food Science
Zdroj: Netherlands Journal of Agricultural Science 51 (2003) 1-2
Netherlands Journal of Agricultural Science, 51(1-2), 67-89
ISSN: 2212-1307
1573-5214
0028-2928
DOI: 10.1016/s1573-5214(03)80027-1
Popis: To assess cattle slurry manure quality in relation to feeding strategy, a field experiment and a bio-assay were carried out with slurries from four dairy farming systems that used diets differing in protein content and digestibility. Several quality aspects were evaluated. In the field experiment the effects of slurry manure type on herbage rejection by grazing heifers and herbage yield on undisturbed plots under cages were studied for a grass monoculture and a grass/clover mixture. The bio-assay, consisting of a cress (Lepidium sativum L.) seed germination test, was used to study differences in phytotoxicity between the slurry types. After five weeks of undisturbed growth at equal amounts of applied inorganic nitrogen (N), the herbage yields differed statistically for the different slurries. This was probably due to immobilization of N in the case of the two slurries from farming systems in which straw was fed and used as bedding material. Herbage rejection by grazing animals was significantly shown for all slurry types and was significantly and positively correlated with the NH3/NH4+-N content of the slurry. The slurries showed large differences in phytotoxicity to seeds and seedlings in the bio-assay. Ammonia and electric conductivity appeared to be the most important slurry parameters with inhibiting effects. The slurries with a high C/N ratio showed lowest phytotoxicity. Phytotoxicity in the cress seed germination test did not account for reduced herbage yields in the field experiment. On the contrary, when the slurries were ranked according to their phytotoxicity the order was the same as the ranking on the basis of undisturbed herbage yield. It was concluded that there is a need for other laboratory tests that show greater resemblance with what is observed in the field to assess slurry quality.
Databáze: OpenAIRE
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