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| Registros recuperados: 55 | |
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| Lentz, R.D.; Lehrsch, G.A.; Brown, Bradford; Johnson-Maynard, J.; Leytem, A.B.. |
| Efficient recycling of abundant manure resources from regional dairy industries in the semiarid West requires a better understanding of N availability in manure-amended soils. We measured net N mineralization using buried bags, and crop biomass, N uptake, and yields for sprinkler-irrigated, whole (noneroded) and eroded Portneuf soils (coarse-silty, mixed, superactive, mesic Durinodic Xeric Haplocalcid) subject to a one-time manure application. Treatments included a control, fertilizer, two rates of composted dairy manure (28.4, 64.3 Mg ha–1, dry wt.), and two rates of stockpiled dairy manure (23.3, 45.7 Mg ha–1, dry wt.) applied in the fall before the Year 1 cropping season. Plots were planted to sugarbeet (Beta vulgaris L.), winter wheat (Triticum... |
| Tipo: Article |
Palavras-chave: Manure; Amendments; Nitrogen. |
| Ano: 2011 |
URL: http://eprints.nwisrl.ars.usda.gov/1420/1/1390.pdf |
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| Lehrsch, G.A.; Sojka, R.E.; Reed, J.L.; Henderson, R.A.; Kostka, S.J.. |
| Surfactants are chemical compounds that change the contact angle of water on solid surfaces and are commonly used to increase infiltration into hydrophobic soil. Since production fields with water-repellent soil often contain areas of wettable soil, surfactants applied to such fields will likely be applied to wettable soil, with unknown consequences for irrigation-induced erosion, runoff, or soil water relations. We evaluated surfactant and simulated sprinkler irrigation effects on these responses for three wettable, Pacific Northwest soils, Latahco and Rad silt loams and Quincy sandy loam. We studied three surfactants: an alkyl polyglycoside in solution at a concentration of 18 g a.i./kg, a block copolymer at 26 g/kg, and a blend of the two at 43 g/kg.... |
| Tipo: Article |
Palavras-chave: Sprinkler irrigation. |
| Ano: 2011 |
URL: http://eprints.nwisrl.ars.usda.gov/1429/1/1399.pdf |
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| Moore, A.; Satterwhite , Megan; Lehrsch, G.A.; McGeehan, S. |
| Dairy manure applications can potentially improve soil health by adding organic matter (OM) to the soil. However, intensive dairy manure applications can cause salt accumulations on arid, irrigated soils, impairing soil health, which can reduce crop growth and yield. Soil organic matter, a major contributor to soil health, increased by 0.02% for every ton of manure-derived organic matter applied. While soil OM increases typically improve soil health, salt accumulations from manure applications had antagonistic effects on soil health. As manure application rates and frequencies increased, soil properties became increasingly saline-sodic, as indicated by elevated EC and SAR values. Aggregate stability also decreased at the heaviest annual manure... |
| Tipo: Conference or Workshop Item |
Palavras-chave: Application guidelines; Chemistry; Manure. |
| Ano: 2016 |
URL: http://eprints.nwisrl.ars.usda.gov/1619/1/1576.pdf |
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| Lentz, R.D.; Lehrsch, G.A.. |
| Manure from the semiarid West’s dairy industries is a rich nutrient source, but its use for crops can be problematic because soil N availability from manure may vary substantially depending on the year of application. Experimental plots established in Idaho on a Portneuf silt loam (coarse silty, mixed, superactive, mesic Durinodic Xeric Haplocalcid) included six manure treatments and two non-manure treatments with four replicates. The six manure treatments included combinations of two manure rates, Man-1x (0.31 Mg total N/ha) and Man-3x (0.97 Mg total N/ha) applied in the fall either 1, 2, or 3 years previously. The two non-manure treatments were urea fertilizer applied per soil test (Fert) and a control with no amendment. We measured net N... |
| Tipo: Article |
Palavras-chave: Manure; Fertilizer; Soil. |
| Ano: 2012 |
URL: http://eprints.nwisrl.ars.usda.gov/1455/1/1420.pdf |
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| Lentz, R.D.; Lehrsch, G.A.. |
| Manure from the semiarid West’s dairy industries is a rich nutrient source, but its use for crops can be problematic because soil N availability from manure may vary substantially depending on the year of application. Experimental plots established in Idaho on a Portneuf silt loam (coarse silty, mixed, superactive, mesic Durinodic Xeric Haplocalcid) included six manure treatments and two non-manure treatments with four replicates. The six manure treatments included combinations of two manure rates, Man-1x (277 lbs total N/ac) and Man-3x (866 lbs total N/ac) applied in the fall either 1, 2, or 3 years previously. The two non-manure treatments were urea fertilizer applied per soil test (Fert) and a control with no amendment. We measured net N... |
| Tipo: Article |
Palavras-chave: Manure; Nitrogen; Soil. |
| Ano: 2012 |
URL: http://eprints.nwisrl.ars.usda.gov/1447/1/1412.pdf |
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| Lentz, R.D.; Lehrsch, G.A.. |
| The use of solid dairy manure for sugarbeet production is problematic because beet yield and quality are sensitive to deficiencies or excesses in soil N, and soil N availability from manure varies substantially depending on the year of application. Experimental treatments included combinations of two manure rates (0.33 and 0.97 Mg total N ha-1) and three application times, and no manure treatments (control and urea fertilizer). We measured soil net N mineralization and biomass, N uptake, and yields for sprinkler-irrigated sugarbeet. On average, the 1-year-old, low-rate manure, and 1- and 2-year-old, high-rate manure treatments produced 1.2-fold greater yields, 1.1-fold greater estimated recoverable sugar, and 1.5-fold greater gross margins than that of... |
| Tipo: Article |
Palavras-chave: Sugarbeet; Manure; Nitrogen. |
| Ano: 2012 |
URL: http://eprints.nwisrl.ars.usda.gov/1454/1/1419.pdf |
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| Lehrsch, G.A.; Lentz, R.D.; Westermann, D.T.; Kincaid, D.C.. |
| High water application rates beneath the outer spans of center pivot sprinkler systems can cause runoff, erosion, and nutrient losses, particularly from sloping fields. This study determined runoff, sediment losses, and loads of nutrients (dissolved organic C, Nitrate-N, ammonium-N, total phosphorus [TP], ferric-oxide strip phosphorus [FeO P], dissolved reactive phosphorus [DRP], K, Ca, Mg, and Na) in sprinkler runoff for two years after a single application of either stockpiled or composted dairy manure. The two-year field investigation studied five treatments, including a non-amended control, in each of six blocks, with each block situated under a different span of a moving-lateral sprinkler system. In October 1999, we incorporated 29.1 or 71.7 Mg/ha... |
| Tipo: Article |
Palavras-chave: Sprinkler irrigation; Composted manure; Runoff. |
| Ano: 2014 |
URL: http://eprints.nwisrl.ars.usda.gov/1559/1/1515.pdf |
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| Lentz, R.D.; Lehrsch, G.A.. |
| Use of dairy manure to supply crop nutrients is gaining broader acceptance as the cost of fertilizer rises; however, there are concerns regarding manure’s effect on water quality. In 2003 and 2004, we measured sediment, NO3-N, NH4-N, K, dissolved reactive P (DRP), and total P (TP) concentrations in runoff from furrow irrigated field plots (6-7 irrigations/y). Annual treatments included: (M) 13 to 34 Mg/ha stockpiled dairy manure; (F) 78 to 195 kg N/ha inorganic N fertilizer; or (C) control--no amendment. Available N in manure applied each year was similar to amounts applied in fertilizer. Constituent concentrations (mg/L) in runoff ranged widely: sediment, 10 to 50,000; NO3-N, 0 to 4.07; NH4-N, 0 to 2.28; K, 3.6 to 46.4; DRP, 0.02 to 14.3; and TP, 0.03 to... |
| Tipo: Article |
Palavras-chave: Manure; Runoff. |
| Ano: 2010 |
URL: http://eprints.nwisrl.ars.usda.gov/1400/1/1370.pdf |
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| Lehrsch, G.A.; Sojka, R.E.; Koehn, A.C.. |
| Little is known regarding a soil aggregate's tensile strength response to surfactants that may be applied to alleviate soil water repellency. Two laboratory investigations were performed to determine surfactant effects on the tensile strength of 1) Ap horizons of nine wettable, agricultural soils collected from across the continental U.S., and 2) two of the nine soils (Latahco and Rad silt loams from the Pacific Northwest) that were sampled at two depths (5 and 15 mm) after being sprinkler irrigated. Along with an untreated control, three surfactants (an alkyl polyglycoside, an ethylene oxide/propylene oxide block copolymer, and a blend of the two) were spray applied by hand at rates of 0, 1, 1.63, 3.35, 4.79, or 8.14 kg active ingredient ha1 to 1)... |
| Tipo: Article |
Palavras-chave: Sprinkler irrigation. |
| Ano: 2012 |
URL: http://eprints.nwisrl.ars.usda.gov/1467/1/1432.pdf |
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| Registros recuperados: 55 | |
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