Journal article
Manure sampling procedures and nutrient estimation by the hydrometer method for gestation pigs
Bioresource technology, Vol.92(3), pp.243-250
05/2004
Handle:
https://hdl.handle.net/2376/115545
PMID: 14766157
Abstract
Three manure agitation procedures were examined in this study (vertical mixing, horizontal mixing, and no mixing) to determine the efficacy of producing a representative manure sample. The total solids content for manure from gestation pigs was found to be well correlated with the total nitrogen (TN) and total phosphorus (TP) concentrations in the manure, with highly significant correlation coefficients of 0.988 and 0.994, respectively. Linear correlations were observed between the TN and TP contents and the manure specific gravity (correlation coefficients: 0.991 and 0.987, respectively). Therefore, it may be inferred that the nutrients in pig manure can be estimated with reasonable accuracy by measuring the liquid manure specific gravity. A rapid testing method for manure nutrient contents (TN and TP) using a soil hydrometer was also evaluated. The results showed that the estimating error increased from +/-10% to +/-30% with the decrease in TN (from 1000 to 100 ppm) and TP (from 700 to 50 ppm) concentrations in the manure. Data also showed that the hydrometer readings had to be taken within 10 s after mixing to avoid reading drift in specific gravity due to the settling of manure solids.
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Details
- Title
- Manure sampling procedures and nutrient estimation by the hydrometer method for gestation pigs
- Creators
- Jun Zhu - Southern Research and Outreach Center, University of Minnesota, 35838 120th Street, Waseca, MN 56093-4521, USA. zhuxx034@umn.eduPius M NdegwaZhijian Zhang
- Publication Details
- Bioresource technology, Vol.92(3), pp.243-250
- Academic Unit
- Biological Systems Engineering, Department of
- Publisher
- England
- Identifiers
- 99900547598601842
- Language
- English
- Resource Type
- Journal article