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| Registros recuperados: 92 | |
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| Ducey, Tom; Ippolito, J.A.; Cantrell, K.B.; Novak, J.M.; Lentz, R.D.. |
| It has been demonstrated that soil amended with biochar, designed specifically for use as a soil conditioner, results in changes to the microbial populations that reside therein. These changes have been reflected in studies measuring variations in microbial activity, biomass, and community structure. Despite these studies, very few experiments have been performed examining microbial genes involved in nutrient cycling processes. Given the paucity of research in this area, we designed a six-month study in a Portneuf soil (coarse-silty, mixed, superactive, mesic Durinodic Xeric Haplocalcid) treated with three levels (1%, 2%, and 10% w/w ratio) of a biochar pyrolyzed from switchgrass (Panicum virgatum) at 350°C and steam activated at 800°C to measure the... |
| Tipo: Article |
Palavras-chave: Amendments; Chemistry; Nitrogen; Soil. |
| Ano: 2013 |
URL: http://eprints.nwisrl.ars.usda.gov/1517/1/1481.pdf |
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| Ippolito, J.A.; Ducey, Tom; Cantrell, K.B.; Novak, J.M.; Lentz, R.D.. |
| An acidic (pH 5.8) biochar was created using a low pyrolysis temperature (350 degrees celsius) and steam activation to potentially improve the soil physicochemical status of an eroded calcareous soil. Biochar was added at 0, 1, 2, and 10 percent (by weight) to an eroded Portneuf soil (coarse-silty, mixed, superactive, mesic Durinodic Xeric Haplocalcid) and destructively sampled at 1, 2, 3, 4, 5, and 6 month intervals. Soil was analyzed for volumetric water content, pH, nitrate-nitrogen, ammonium-nitrogen, plant-available iron, zinc, manganese, copper, and phosphorus, organic carbon, carbon dioxide respiration, and microbial enumeration via extractable DNA and 16S rRNA gene copies. Soil water content increased with biochar application regardless of rate;... |
| Tipo: Article |
Palavras-chave: Calcareous soil; Chemistry; Soil. |
| Ano: 2015 |
URL: http://eprints.nwisrl.ars.usda.gov/1598/1/1556.pdf |
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| Lehrsch, G.A.; Brown, B.; Lentz, R.D.; Johnson-Maynard, J.L.; Leytem, A.B.. |
| To maximize recoverable sucrose from sugarbeet (Beta vulgaris L.), producers must effectively manage added nitrogen (N), whether it be from urea or organic sources such as manure or composted manure. Our multi-site study’s objective was to determine the effects of a one-time application of stockpiled and composted dairy cattle manure on sugarbeet N uptake, N recovery (NR) and N use efficiency (NUE). First-year treatments at Site 1 included a control (no N), urea (202 kg N/ha), compost (218 and 435 kg estimated available N/ha), and manure (140 and 280 kg available N/ha). Site 2 treatments were a control, urea (82 kg N/ha), compost (81 and 183 kg available N/ha), and manure (173 and 340 kg available N/ha). Compost and manure were incorporated into two... |
| Tipo: Article |
Palavras-chave: Sugarbeet; Application guidelines; Manure. |
| Ano: 2015 |
URL: http://eprints.nwisrl.ars.usda.gov/1600/1/1558.pdf |
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| Lehrsch, G.A.; Lentz, R.D.; Bjorneberg, D.L.; Sojka, R.E.. |
| Soil can be eroded by sprinkler or surface irrigation. Once sprinkler droplet kinetic energy detaches soil, overland flow transports the sediment downslope and off-site. Protecting the soil surface, increasing sprinkler wetted diameters, and tilling to increase infiltration and thereby lessen overland flow are effective control measures. Runoff minimization and management are key to reducing erosion induced by either sprinkler or surface irrigation. Slowing furrow stream velocities with mulch or crop residues reduces the flow’s hydraulic shear and, in turn, detachment of soil from furrow wetted perimeters. Stabilizing surface soil with, for example, polyacrylamide, bio-polymers, or whey keeps soil in place and helps maintains acceptable water quality in... |
| Tipo: Article |
Palavras-chave: Sprinkler irrigation; Erosion; Water management. |
| Ano: 2014 |
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| Lentz, R.D.; Lehrsch, G.A.. |
| Little is known about inorganic fertilizer or manure effects on organic carbon (OC) and inorganic C (IC) losses from a furrow irrigated field, particularly in the context of other system C gains or losses. In 2003 and 2004, we measured dissolved organic and inorganic C (DOC, DIC), particulate OC and IC (POC, PIC) concentrations in irrigation inflow, runoff, and percolation waters (6-7 irrigations/y); C inputs from soil amendments and crop biomass; harvested C; and gaseous C emissions from field plots cropped to silage corn (Zea mays L.) in southern Idaho. Annual treatments included: (M) 13 (y 1) and 34 Mg/ha (y 2) stockpiled dairy manure; (F) 78 (yr 1) and 195 kg N/ha (y 2) inorganic N fertilizer; or (NA) no amendment--control. The mean annual total C... |
| Tipo: Article |
Palavras-chave: Dissolved Orgainc Carbon (DOC); Manure; Fertilizer. |
| Ano: 2014 |
URL: http://eprints.nwisrl.ars.usda.gov/1544/1/1501.pdf |
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| Ippolito, J.A.; Stromberger, M.E.; Lentz, R.D.; Dungan, R.S.. |
| Biochar may improve nutrient retention when applied to soils, so co-applying biochar with manure may be synergistically beneficial to soils. In a laboratory incubation study, dairy manure (2% by weight) and a hardwood-based, fast pyrolysis biochar was applied (0, 1, 2, and 10% by weight) to a calcareous soil. Destructive sampling occurred at 1, 2, 3, 4, 5, 6 and 12 months, and monitored for changes in soil chemistry, water content, microbial respiration, bacterial populations, and microbial community structure. Increasing biochar application rate improved the soil water content, which may be beneficial in limited irrigation or rainfall areas. Biochar application increased soil organic carbon content and plant-available iron and manganese, while a... |
| Tipo: Article |
Palavras-chave: Soil. |
| Ano: 2015 |
URL: http://eprints.nwisrl.ars.usda.gov/1596/1/1554.pdf |
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| Lentz, R.D.; Ippolito, J.A.; Spokas, K.A.. |
| Amending soil with biochar may be a means of sequestering atmospheric CO2 and improving soil quality, but few multiyear field studies have examined the impacts of a one-time biochar application in an irrigated, calcareous soil. We fall-applied four treatments: dairy manure (18.7 tons/ac dry wt.); hardwood-derived biochar (10 tons/ac dry wt.); combined biochar and manure; and no amendments (control). We measured net N-mineralization using buried soil bags and soil greenhouse gas emissions (CO2, CH4, and N2O) from late spring to fall, corn silage yields, and crop N uptake each year. The influence of biochar and manure on silage yield changed with time after application in fall 2008. Biochar increased corn yields slightly (5%) in 2009, decreased yields by 14%... |
| Tipo: Article |
Palavras-chave: Agricultural Soils; Manure Management; Calcareous soil; Soil quality; Soil. |
| Ano: 2015 |
URL: http://eprints.nwisrl.ars.usda.gov/1584/1/1540.pdf |
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| Registros recuperados: 92 | |
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