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Fine Root Development Of Alfalfa As Affected By Wheel Traffic, Eric A. Rechel, Burl D. Meek, William R. Detar, Lyle M. Carter
Fine Root Development Of Alfalfa As Affected By Wheel Traffic, Eric A. Rechel, Burl D. Meek, William R. Detar, Lyle M. Carter
William R DeTar
Root development in alfalfa (Medicago satire L.) is dependent of many factors including the soil environment which is influenced by crop management procedures. Soil compaction, which is unavoidable under current management procedures, can have a detrimental effect on root development. The purpose of this field experiment was to compare the effects of controlled and conventional traffic management on alfalfa fine root growth in a Wasco sandy loam (coarseloamy, mixed, nonacid thermic Typic Torriorthent). No wheel traffic and traffic only before planting were compared to two conventional systems that varied in the amount of traffic applied during crop production. Twenty months …
Infiltration Rate As Affected By An Alfalfa And No-Till Cotton Cropping System, Burl D. Meek, William R. Detar, D. Rolph, Eric A. Rechel, Lyle M. Carter
Infiltration Rate As Affected By An Alfalfa And No-Till Cotton Cropping System, Burl D. Meek, William R. Detar, D. Rolph, Eric A. Rechel, Lyle M. Carter
William R DeTar
Previous studies measured a long-term increase in infiltration rate in a sandy loam soil with time when alfalfa (Medicago saliva L., cv. WL514) was grown. Cotton (Gossypium hirsutum L.) was directplanted into alfalfa to determine if the high infiltration rates measured under alfalfa culture could be maintained in cotton under either a till or no-till system. Treatments were no-till or tillage to the 0.15 - m depth just before the cotton was planted. Prior compaction levels created by harvest traffic applied to the alfalfa made the soil loose or compacted. Cotton was planted flat and irrigated as a basin. Infiltration …
Multi-Isfet Sensors For Soil Nitrate Analysis, Stuart J. Birrell, John W. Hummel
Multi-Isfet Sensors For Soil Nitrate Analysis, Stuart J. Birrell, John W. Hummel
Stuart J. Birrell
The management of a field as a heterogeneous area is now being investigated by many researchers in universities, companies, and research institutions. However, for site-specific application of inputs, it is necessary to develop systems to sense the variation of important properties in real time. Several studies have shown that ion selective electrodes can be used to measure soil nitrates. This work involves an investigation in the use of Ion Selective Field Effect Transistors (ISFETs), to measure soil nitrate levels.
Modeling Environmental Response To Power Interruptions In Swine Nurseries, Jay D. Harmon, E. R. Collins Jr., E. T. Kornegay
Modeling Environmental Response To Power Interruptions In Swine Nurseries, Jay D. Harmon, E. R. Collins Jr., E. T. Kornegay
Jay D. Harmon
A deterministic simulation model was developed to help assess emergency environmental needs of swine nurseries by modeling short term power interruptions. The model accounts for heat exchange by conduction, convection, radiation and air infiltration. A sub-model, developed by the North Central Region Committee 179, was used to predict swine heat and moisture loss. The model was validated using a nursery constructed of concrete block. The model performed well for cases with a constant solar load but tended to overpredict temperature changes during periods of no solar load. Validation indicated that wind velocity had the most effect upon model error. Sensitivity …