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| Registros recuperados: 31 | |
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| Entry, J.A.; Sojka, R.E.; Shewmaker, G.E.. |
| Increasing the amount of C in soils may be one method to reduce the concentration of C02 in the atmosphere. We measured organic C stored in southern Idaho soils having long term cropping histories that supported native sagebrush vegetation (N SB), irrigated moldboard plowed crops (IMP), irrigated conservation -chisel- tilled crops (ICT) and irrigated pasture systems (1?). The C02 emitted as a result of fertilizer production, farm operations and CO; lost via dissolved carbonate in irrigation water, over a 30 year period, was included. Net organic C in ecosystems decreased in the order IP>ICT>NSB>IMP. In this study, if NSB were converted to IMP, 0.15 g C m“2 would be emitted to the atmosphere, but if converted to IP , 3.56 g C m'2 could be... |
| Tipo: Book Section |
Palavras-chave: Chemistry; Mass Import - autoclassified (may be erroneous). |
| Ano: 2007 |
URL: http://eprints.nwisrl.ars.usda.gov/833/7/1232.pdf |
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| Sojka, R.E.; Lentz, R.D.; Shainberg, I.; Trout, T.J.; Ross, C.W.; Robbins, C.W.; Entry, J.A.; Aase, J.K.; Bjorneberg, D.L.; Orts, W.J.; Westermann, D.T.; Morishita, D.W.; Watwood, M.E.; Spofford, T.L.; Barvenik, F.W.. |
| Tipo: Conference or Workshop Item |
Palavras-chave: Water-soluble PAM (WSPAM); Mass Import - autoclassified (may be erroneous). |
| Ano: 2000 |
URL: http://eprints.nwisrl.ars.usda.gov/943/1/1022.pdf |
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| Entry, J.A.; Sojka, R.E.. |
| We compared the efficacy of matrix based fertilizers (MBFs) formulated to reduce NO3-, NH4+, and total phosphorus (TP) leaching, with Osmocoate 14-14-14, a conventional commercial slow release fertilizer (SRF) and an unamended control in three different soil textures in a greenhouse column study. The MBFs covered a range of inorganic N and P in compounds that are relatively loosely bound (MBF 1) to more moderately bound (MBF 2) and more tightly bound compounds (MBF 3) mixed with Al(SO4)3H2O and/or Fe2(SO4)3 and with high ionic exchange compounds starch, chitosan and lignin. When N and P are released, the chemicals containing these nutrients in the MBF bind N and P to a Al(SO4)3H2O and/or Fe2(SO4)3 starch-chitosan-lignin matrix. One milligram (8000 spores)... |
| Tipo: Article |
Palavras-chave: Fertilizer. |
| Ano: 2008 |
URL: http://eprints.nwisrl.ars.usda.gov/1283/1/1260.pdf |
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| Ippolito, J.A.; Spackman, R.; Entry, J.A.; Sojka, R.E.. |
| Phosphorus-containing sediment entering surface water may degrade water quality and promote eutrophication. Grass is sometimes planted as a vegetated filter strip buffer along vulnerable receiving water to trap sediment and reduce the severity of phosphorus nutrient loading. However, eutrophication is still a problem in some waterways due to dissolved phosphorus leaching from senesced vegetation in grassed areas, independent of trapped sediment. A rainfall simulator (96 mm/h) was used to study the vegetative conditions under which losses of total dissolved phosphorus and filterable reactive phosphorus leaching are likely. Boxes containing a Portneuf silt loam soil (Xeric Haplocalcid) were planted with annual ryegrass (Lolium perenne) and cut at two... |
| Tipo: Article |
Palavras-chave: Runoff losses; Phosphorous. |
| Ano: 2014 |
URL: http://eprints.nwisrl.ars.usda.gov/1545/1/1503.pdf |
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| Registros recuperados: 31 | |
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