|
|
|
| Registros recuperados: 1,593 | |
|
| |
|
| |
|
| |
|
| |
|
|
| Leytem, A.B.; Plumstead, P.W.; Maguire, R.O.; Kwanyuen, P.; Burton, J.W.; Brake, J.. |
| Dietary Ca has been reported to influence the amount of phytate excreted from broilers and affect the solubility of P in excreta. To address the effects of dietary Ca and phytate on P excretion, 12 dietary treatments were fed to broilers from 16 to 21 d of age. Treatments consisted of 3 levels of phytate P (0.10, 0.24, and 0.28%) and 4 levels of Ca (0.47, 0.70, 0.93, and 1.16%) in a randomized complete block design. Feed phytate concentrations were varied by formulating diets with 3 different soybean meals (SBM): a low-phytate SBM, a commercial SBM, and a high phytate Prolina SBM having phytate P concentrations of 0.15 to 0.51%. Fresh excreta was collected from cages during 2 separate 24-h periods; collection I commenced after the start of dietary... |
| Tipo: Article |
Palavras-chave: Manure. |
| Ano: 2008 |
URL: http://eprints.nwisrl.ars.usda.gov/1280/1/1257.pdf |
| |
|
| |
|
| |
|
|
| Spokas, K.A.; Novak, J.M.; Masiello, C.A.; Johnson, M.G.; Colosky, E.C.; Ippolito, J.A.; Trigo, C.. |
| Data collected from both artificially and field (naturally) weathered biochar suggest that a potentially significant pathway of biochar disappearance is through physical breakdown of the biochar structure. Through scanning electron microscopy (SEM) we characterized this physical weathering which increased structural fractures and possessed higher numbers of liberated biochar fragments. This was hypothesized to be due to the graphitic sheet expansion accompanying water sorption coupled with comminution. These fragments can be on the micro and nano-scale, but are still carbon-rich particles with no detectable alteration in the oxygen to carbon ratio of the original biochar. However, these particles are now easily dissolved and could be moved by... |
| Tipo: Article |
Palavras-chave: Dissolved Organic Carbon (DOC). |
| Ano: 2014 |
URL: http://eprints.nwisrl.ars.usda.gov/1548/1/1502.pdf |
| |
|
|
| Cary, J.W.; Kohl, R.A.; Westermann, D.T.; Rickman, R.W.. |
| One of the most effective ways to prevent the wind erosion of sandy soils is to maintain a continuous crop cover. Summer row cropping following a winter grain cover offers several attractive features, although it does present management problems. The grain cover must be established in the fall after harvesting the row crop, and the transition back to a row crop in the spring must be made without leaving the soil surface unprotected from the wind. This report summarizes 4 years of observations and exploratory studies in which a variety of cover-row cropping management systems were tested with emphasis on methods for establishing row crops directly in the winter cover. Pertinent literature and observations of other field trials are also discussed. |
| Tipo: Technical Bulletin |
Palavras-chave: Sprinkler irrigation; Erosion; Mass Import - autoclassified (may be erroneous). |
| Ano: 1975 |
URL: http://eprints.nwisrl.ars.usda.gov/1129/1/302.pdf |
| |
|
| |
|
|
| Strausbaugh, C.A.; Wenninger, E.J.; Eujayl, Imad A.. |
| Curly top in sugar beet is a serious problem that is caused by Beet curly top virus and other closely related species and transmitted by the beet leafhopper. In order to find a means of reducing curly top in sugar beet, 15 combinations of insecticide seed (Poncho, Poncho Beta, and Poncho Votivo) and foliar (Asana, Cyazypyr, Lorsban, Mustang, Scorpion, and Sivanto) treatments were evaluated versus an untreated check during the 2012 and 2013 growing seasons. An epiphytotic was created by releasing viruliferous beet leafhoppers 58 to 59 days after planting. The foliar sprays were applied 6 to 7 days before and again 6 to 8 days after leafhopper release. Seed treatments (active ingredient: clothianidin) were able to reduce symptoms by 26 to 42% and increase... |
| Tipo: Article |
Palavras-chave: Sugarbeet. |
| Ano: 2014 |
URL: http://eprints.nwisrl.ars.usda.gov/1541/1/1498.pdf |
| |
|
| |
|
| |
|
| |
|
| |
|
| |
|
|
| Entry, J.A.; Sojka, R.E.; Hicks, B.J.. |
| Water-soluble anionic polyacrylamide (PAM) is applied to millions of hectares worldwide as a highly effective erosion-preventing and infiltration-enhancing polymer, when applied at rates of 1 to 2 kg ha? 1 (i.e., 1 to 10 g m? 3) in furrow water. PAM degradation has not directly been measured in soil. We tested the ability of stable isotopes of C and N at natural abundance to estimate PAM degradation rates. Values of ?13C were related to anionic PAM concentration in a positive curvilinear relationship in a low-C, low-N, Durinodic Xeric Haplocalcid (Portneuf series) soil. The other soils with higher organic C or N concentrations did not show significant relationships between PAM concentrations and ?13C values. The ?15N values were not related to anionic PAM... |
| Tipo: Article |
Palavras-chave: Soil. |
| Ano: 2008 |
URL: http://eprints.nwisrl.ars.usda.gov/1276/1/1253.pdf |
| |
|
| |
| Registros recuperados: 1,593 | |
|
|
|
