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| Registros recuperados: 36 | |
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| Lentz, R.D.; Ippolito, J.A.. |
| When added to soils, carbon-rich biochar derived from the pyrolysis of woody materials can sequester atmospheric carbon dioxide, mitigate climate change, and potentially increase crop productivity. However, research is needed to confirm the suitability and sustainability of biochar application to different soils. We applied four treatments (dry wt.) to an irrigated calcareous soil in Nov. 2008: control; stockpiled dairy manure, 18.8 Mg/ha; hardwood-derived biochar, 22.4 Mg/ha; and manure + biochar using previous rates. Nitrogen fertilizer was applied when needed (based on pre-season soil test N and crop requirements) in all plots and years with N mineralized from added manure included in this determination. Available soil nutrients (NH4-N, NO3-N, Olsen... |
| Tipo: Article |
Palavras-chave: Corn / maize; Manure; Calcareous soil; Soil. |
| Ano: 2012 |
URL: http://eprints.nwisrl.ars.usda.gov/1459/1/1424.pdf |
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| Lehrsch, G.A.; Kincaid, D.C.. |
| Dairy manure increases the yields of dry bean (Phaseolus vulgaris L.) and spring wheat (Triticum aestivum L.) from eroded, furrow-irrigated soils and may increase corn (Zea mays L.) silage yield from steeper eroded areas under sprinkler irrigation. In a 2-year field study in southern Idaho on Portneuf silt loam (coarse silty, mixed, superactive, mesic Durinodic Xeric Haplocalcid), the effects of a one-time, fall application of 29 or 72 Mg ha-1 of dry manure or 22 or 47 Mg ha21 of dry compost on subsequent silage yield and nitrogen (N) uptake from previously eroded, sprinkler-irrigated hill slopes were evaluated. In October 1999, stockpiled or composted dairy manure was disked to a depth of 0.15 m into plots with slopes from 0.8 to 4.4%. After... |
| Tipo: Article |
Palavras-chave: Corn / maize; Corn; Composted manure; Chemistry; Fertilizer; Mass Import - autoclassified (may be erroneous). |
| Ano: 2007 |
URL: http://eprints.nwisrl.ars.usda.gov/66/1/1230.pdf |
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| Ippolito, J.A.; Ducey, Tom; Tarkalson, D.D.. |
| Sequestering carbon in soils may be one method to reduce the concentration of carbon dioxide in the atmosphere. We measured inorganic and organic carbon, bacterial biomass and structural community diversity in southern Idaho soils having long term land use histories that supported native sagebrush vegetation (NSB), irrigated moldboard plowed crops (IMP), irrigated conservation (chisel) tilled crops (ICT) and irrigated pasture systems (IP). Organic carbon in soil decreased in the order IP>ICT>NSB>IMP. We use our findings to estimate the organic carbon, potentially sequestered if the use of irrigated agriculture were increased. We also use our findings to estimate inorganic and total carbon, potentially sequestered if the use of irrigated... |
| Tipo: Article |
Palavras-chave: Corn / maize; Amendments. |
| Ano: 2010 |
URL: http://eprints.nwisrl.ars.usda.gov/1406/1/1376.pdf |
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| Londono-R, L; Tarkalson, D.D.; Thies, Janice E.. |
| The adoption of Bt corn has been largely overshadowed by concerns about their unintended effects on human health and the environment. Residues of transgenic Bt crops decomposed more slowly than their non-transgenic isolines in one laboratory study, although no mechanism to explain these observations was proposed. If Bt crop residues were to decompose more slowly in field soils, changes in carbon cycling and nutrient availability could result. We compared the in-field decomposition rates and diversity of decomposers colonizing residues of two Cry1Ab Bt corn hybrids, active against the European corn borer, with their non-transgenic isolines in litterbags placed in a Nebraska field. After five months, we found no significant differences in either the rates of... |
| Tipo: Article |
Palavras-chave: Corn / maize; Soil quality. |
| Ano: 2013 |
URL: http://eprints.nwisrl.ars.usda.gov/1476/1/1441.pdf |
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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: Corn / maize; Dissolved Organic Carbon (DOC); Manure. |
| Ano: 2014 |
URL: http://eprints.nwisrl.ars.usda.gov/1546/1/1504.pdf |
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| Lehrsch, G.; Sojka, R.; Westermann, D.. |
| Banding and sidedressing nitrogen (N) fertilizer on a never-irrigated side of a row of corn (Zea mays L.) were hypothesized to maintain yield and decrease nitrate leaching. In a two—year ?eld study on a Portneuf silt loam (Durinodic Xeric Haplocalcid) in southern Idaho, we evaluated effects on yield and N uptake of 1) urea placement (broadcast pre-plant vs. band at planting), 2) row spacings (30-in vs. an offset 22—in spacing in which every pair of 22-—in rows was positioned close to a furrow rather than each row on a bed center), and 3) water management. Our water management, termed irrigated furrow positioning, consisted of every- second furrow irrigation in which we applied water to either a) the same or b) the Opposite side of the row with... |
| Tipo: Conference or Workshop Item |
Palavras-chave: Corn / maize; Water management; Mass Import - autoclassified (may be erroneous). |
| Ano: 2008 |
URL: http://eprints.nwisrl.ars.usda.gov/1267/7/1243.pdf |
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| Registros recuperados: 36 | |
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