|
|
|
|
|
| Novak, J.M.; Busscher, W.J.; Watts, D.W.; Amonette, J.; Ippolito, J.A.; Lima, I.M.; Gaskin, J.; Das, K.C.; Steiner, C.; Ahmedna, M.; Rehrah, D.; Schomberg, H.H.. |
| Droughts associated with low or erratic rainfall distribution can cause detrimental crop moisture stress. This problem is exacerbated in the USA’s arid western and southeastern Coastal Plain due to poor rainfall distribution, poor soil water storage, or poorly-aggregated, subsurface hard layers that limit root penetration. We hypothesized that soil physical deficiencies may be improved by biochar applications. Research indicates a single biochar will not serve as a universal supplement to all soils; consequently, biochars may need to be designed with physico-chemical properties that can ameliorate specific soil physical deficiencies. We conducted a laboratory study that examined the effect of biochar on soil moisture retention and aggregate formation.... |
| Tipo: Article |
Palavras-chave: Soil quality; Soil water (soil moisture). |
| Ano: 2012 |
URL: http://eprints.nwisrl.ars.usda.gov/1523/1/1485.pdf |
| |
|
|
| Ippolito, J.A.; Novak M, J; Busscher, W.J.; Ahmedna, M.; Rehrah, D.; Watts, D.W.. |
| The use of biochar has received growing attention with regards to improving the physico-chemical properties of highly weathered Ultisols and Oxisols, yet very little research has focused on effects in Aridisols. The objective of this study was to investigate the effect of either low or high temperature (250 or 500C) pyrolyzed switchgrass biochar on two Aridisols. In a pot study, biochar was added at 2% w/w to either a Declo loam (Xeric Haplocalcids) or a Warden very fine sandy loam (Xeric Haplocambids) and then incubated at 15% moisture content (by weight) for 127 days; a control (no biochar) was also included. Soils were leached with 1.2 to 1.3 pore volumes of deionized water on days 34, 62, 92, and 127, and cumulative leachate Ca, K, Mg, Na, P, Cu,... |
| Tipo: Article |
Palavras-chave: Soil. |
| Ano: 2012 |
URL: http://eprints.nwisrl.ars.usda.gov/1463/1/1428.pdf |
| |
|
|
| Ippolito, J.A.; Strawn, D.G.; Scheckel, K.G.; Novak M, J; Ahmedna, M.; Niandou, M.A.S.. |
| Excessive copper concentrations in water systems can negatively impact biological systems. Because copper can form strong associations with organic functional groups, we examined the ability of biochar (a carbon-enriched organic bioenergy by-product) to sorb copper from solution. In a batch experiment, potassium hydroxide-steam activated pecan shell biochar was shaken for 24 hours in pH 6, 7, 8, or 9 buffered solutions containing various copper concentrations to identify effect of pH on biochar copper sorption. Afterwards, all biochar solids from the 24 hours shaking period were air-dried and then analyzed using X-ray absorption fine structure spectroscopy to determine solid-phase copper speciation. In a separate batch experiment, biochar was shaken... |
| Tipo: Article |
Palavras-chave: Soil quality. |
| Ano: 2011 |
URL: http://eprints.nwisrl.ars.usda.gov/1521/1/1483.pdf |
| |
|
|
|
