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| Registros recuperados: 1.593 | |
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| Lentz, R.D.; Westermann, D.T.; Lehrsch, G.A.. |
| Few studies have comprehensively examined nutrient losses in runoff from furrow-irrigated fields, but the rising cost of fertilizer and finite nature of the resource encourages further research. A 2-yr experiment measured runoff losses of sediment, particulate P and N, and dissolved NO3-N, NH4-N, K, and reactive P (DRP) from fertilized, manured, or non-amended fields. Average nutrient losses were substantial, including 15.6 lbs ac/yr dissolved N, P, and K and 73.6 lbs ac/yr particulate N and P. The cost or replacing these nutrients with inorganic fertilizers was not trivial, at $54.69 ac/yr. Relative to non-amended soil, manure increased dissolved K, NO3-N, and DRP in runoff by 2.1x, 1.5x, and 2.7x, respectively. Other experiments evaluated the... |
| Tipo: Conference or Workshop Item |
Palavras-chave: Furrow irrigation; Runoff losses; Nutrients; Sediment. |
| Ano: 2013 |
URL: http://eprints.nwisrl.ars.usda.gov/1518/1/1482.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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| Panella, Leonard W.; Strausbaugh, C.A.. |
| Thirty sea beet (Beta vulgaris subsp. maritima (L.) Arcang) and beet (Beta vulgaris subsp. vulgaris L.) plant introduction (PI) accessions from the Beta collection of the USDA-ARS National Plant Germplasm System were screened for resistance to Beet severe curly top virus (BSCTV) and other closely related Curtovirus species in 2012. Commercial cultivars Monohikari and HM PM90 and Betaseed, Inc. germplasm line G6040 were included as susceptible and resistant checks. The curly top evaluation was conducted at the USDA-ARS North Farm in Kimberly, ID which has Portneuf silt loam soil and had been in alfalfa in 2011. The field was plowed in the fall and in the spring, fertilized (90 lb N and 110 lb P2O5/A) on 16 Apr 12, sprayed with Ethotron (2 pt/A), and roller... |
| Tipo: Article |
Palavras-chave: Curly top; Sugarbeet. |
| Ano: 2013 |
URL: http://eprints.nwisrl.ars.usda.gov/1529/1/1488.pdf |
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| Leytem, A.B.; Willing, B.P.; Thacker, P.A.. |
| Eighty, 12-day-old, male broiler chicks, were fed one of four diets to determine the effects of feeding grains varying in phytate phosphorus (P) and intrinsic phytase activity on ileal and excreta P digestibility and composition. The diets contained approximately 970.7 g grain kg?1 (maize, high fat–low lignin oat, normal barley or low-phytate barley) with the cereal supplying the sole source of dietary P. The diets were fed for a 7-day acclimation period followed by a 2 day excreta collection while ileal digesta was collected at slaughter on day 21. The coefficients of ileal apparent digestibility (CIAD) for P and phytate P ranged from 0.79 (normal barley) to 0.86 (maize and low-phytate barley) and 0.76 (low-phytate barley) to 0.89 (maize),... |
| Tipo: Article |
Palavras-chave: Soil; Animal; Chemistry. |
| Ano: 2008 |
URL: http://eprints.nwisrl.ars.usda.gov/1323/1/1300.pdf |
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| Registros recuperados: 1.593 | |
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