Abstract
Abstract Effects of applications of exceptional quality biosolids (sludge) to bahiagrass (Paspalum notatum) pastures in successive years, or residual effects of applications the previous year, on micromineral status of forage and soils in north Florida were studied in relation to beef cattle requirements. Thirty 0.8 ha pastures were assigned one of 9 treatments representing three sources of biosolids. Two biosolids (Baltimore and Tampa) were applied at an “agronomic rate” (X) and 2X. Four of the treatments represented residual applications of Baltimore and Tampa biosolids which had been applied to pastures as in the previous year. The control plot received NH4NO3. Forages were analyzed for copper (Cu), iron (Fe), manganese (Mn), zinc (Zn), molybdenum (Mo), cobalt (Co) and selenium (Se), and soils were analyzed for Mehlich-l extractable Cu, Mn, and Zn. Forage Co, Cu, and Se concentrations were low and deficient in relation to beef cattle requirements for most of the grazing season. Forages receiving Tampa treatments had improved (P<0.05) Zn concentrations over the control at most sampling times, with this increase often seen in the Tampa residuals as well. Forage Mo concentrations were minute, and though some treatment effects were observed (P<0.05), there was no threat of toxic accumulations observed at any time. Forage Fe concentrations were improved over year one and Mn concentrations were high and adequate for grazing ruminants. Biosolids fertilization improved the extractable soil Zn status of some treatment groups, and extractable soil concentrations of treated pastures were generally adequate in Cu and Mn for plant growth. In relation to beef cattle requirements, the majority of forages were deficient in Co, Cu, Se, and Zn. *Florida Agricultural Experiment Station Journal Series No. R-07563. Acknowledgments The authors gratefully acknowledge support funds from the Water Environment Research Foundation, 601 Wythe Street, Alexandra, VA 223141194. Notes *Florida Agricultural Experiment Station Journal Series No. R-07563.
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Claims 11
Claim · model-written summary
Forage Co, Cu, and Se were deficient for most of the grazing season.
Verbatim
e0“Forage Co, Cu, and Se concentrations were low and deficient in relation to beef cattle requirements for most of the grazing season”
t0“forage and soil”
e1“bahiagrass (Paspalum notatum) pastures”
Claim · model-written summary
Tampa biosolids increased forage Zn relative to control at most sampling times.
Verbatim
e0“Forages receiving Tampa treatments had improved (P<0.05) Zn concentrations over the control at most sampling times”
e1“bahiagrass (Paspalum notatum) pastures”
Claim · model-written summary
Residual Tampa biosolids often increased forage Zn.
Verbatim
e0“this increase often seen in the Tampa residuals as well”
e1“bahiagrass (Paspalum notatum) pastures”
e2“Zn concentrations over the control”
Claim · model-written summary
Forage Mo concentrations were minute.
Verbatim
e0“Forage Mo concentrations were minute”
e1“bahiagrass (Paspalum notatum) pastures”
Claim · model-written summary
Some treatments significantly affected forage Mo concentrations.
Not reportedComparatorDirection
Verbatim
e0“though some treatment effects were observed (P<0.05)”
e1“Forage Mo concentrations were minute”
e2“bahiagrass (Paspalum notatum) pastures”
Claim · model-written summary
Forage Mo did not reach toxic accumulation at any time.
Verbatim
e0“there was no threat of toxic accumulations observed at any time”
e1“Forage Mo concentrations were minute”
e2“bahiagrass (Paspalum notatum) pastures”
Claim · model-written summary
Forage Fe concentrations improved over year one.
Verbatim
e0“Forage Fe concentrations were improved over year one”
e1“bahiagrass (Paspalum notatum) pastures”
Claim · model-written summary
Forage Mn concentrations were high and adequate for grazing ruminants.
Verbatim
e0“Mn concentrations were high and adequate for grazing ruminants”
e1“bahiagrass (Paspalum notatum) pastures”
Claim · model-written summary
Biosolids fertilization improved extractable soil Zn in some treatment groups.
- Taxon
- bahiagrasse1
- Treatment
- Biosolids fertilizatione0
- Outcome
- extractable soil Zn statuse0
- Direction
- improvede0
- Qualifier
- some treatment groupse0
Not reportedComparator
Verbatim
e0“Biosolids fertilization improved the extractable soil Zn status of some treatment groups”
e1“bahiagrass (Paspalum notatum) pastures”
Claim · model-written summary
Treated pasture soils generally had adequate extractable Cu and Mn for plant growth.
Verbatim
e0“extractable soil concentrations of treated pastures were generally adequate in Cu and Mn for plant growth”
e1“bahiagrass (Paspalum notatum) pastures”
Claim · model-written summary
Most forage was deficient in Co, Cu, Se, and Zn relative to cattle requirements.
Verbatim
e0“In relation to beef cattle requirements, the majority of forages were deficient in Co, Cu, Se, and Zn”
e1“bahiagrass (Paspalum notatum) pastures”