Browsing by Author "Hallock, D. L."
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- Adaptation of grass-legume mixtures for southeastern VirginiaHallock, D. L.; Blaser, R. E. (Roy Emil), 1912- (Virginia Agricultural Experiment Station, 1958-05)Perennial grasses and legumes vary in their adaptation to temperature, moisture, light and other factors
- Fertility investigations with a ladino-orchardgrass mixture in southeastern Virginia 1954-1961Hallock, D. L.; Blaser, R. E. (Virginia Agricultural Experiment Station, 1964-08)Phosphorus, potassium and nitrogen fertility investigations with a ladino orchardgrass mixture were conducted on Bertie fine sandy loam at Holland Virginia from 1954 to 1961
- Pollutant movement to shallow ground water tables from swine waste lagoonsCiravolo, T. G.; Martens, David C.; Hallock, D. L.; Collins, Eldridge R. Jr.; Kornegay, Ervin T. (Water Resources Research Center, Virginia Polytechnic Institute and State University, 1977)Th is research investigated the effect of three anaerobic swine-waste lagoons on the quality of nearby ground water. The lagoons, in the Coastal Plain region of Virginia, were located on soils with high water tables and with varying drainage characteristics. Over a 14-month period in 1974 and 1975, ground water samples were taken from wells located at various depths and distances from the lagoons. These samples then were analyzed to determine the extent of contamination due to the lagoons. The biological constituent analyzed was the number of fecal coliform bacteria; chemical constituents analyzed were concentrations of Cl, Cu, Mn, NH4-N, N03-N, P04-P, and Zn. Research findings showed that the quality of ground water was affected least around one lagoon constructed at ground level in a poorly drained soil with a clay subsoil. No ground water contamination was found more than 3 m from this lagoon. In contrast, ground water around two lagoons constructed with embankments above ground level, one in a sandy clay loam subsoil and the other in a sandy subsoil, showed traces of swinewaste components as far away as 30 m. Pollutant levels in ground water around the former lagoon were below U.S. Public Health Service drinking water standards, while pollutant levels around the latter lagoon exceeded those standards on many occasions. These experimental results indicate that seepage may occur from lagoons with embankments above ground level in sandy soil, and that biological sealing in such lagoons may not sufficiently protect shallow aquifers from contamination.
- Response of coastal and midland bermudagrass and Ky. 31 fescue to nitrogen in southeastern VirginiaHallock, D. L.; Brown, R. H.; Blaser, R. E. (Virginia Agricultural Experiment Station, 1966-07)This investigation was initiated to study the relative adaptation and productiveness of Coastal and Midland bermudagrasses in southeastern Virginia under high rates of nitrogen fertilization.
- Response of soybeans to gypsum, lime, and fertilizer on three soils in southeastern VirginiaHallock, D. L. (Virginia Agricultural Experiment Station, 1964-08)Experiments with soybeans which included 4 rates of gypsum, 3 rates of fertilization, and 2 rates of lime were carried out on Craven fine sandy loam in 1959, Bladen fine sandy loam in 1960, and Sassafras loamy fine sand in 1961
- Temperature and precipitation predictions for the Holland, Virginia areaHallock, D. L. (Virginia Agricultural Experiment Station, 1965-08)Estimates for certain risks or chances of occurrence of various air temperatures and amounts of precipitation at particular times, based on 32 years of records.
- Utilization of topdressed superphosphate by pasture forages in southeastern VirginiaHallock, D. L.; Rich, Charles I. (Virginia Agricultural Experiment Station, 1957-07)With the increase of livestock farming in southeastern Virginia, great emphasis must be placed on efficient pasture practices