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Full-Text Articles in Engineering
Regrowth And Yield Of Alfalfa As Influenced By Wheel Traffic, Burl D. Meek, Lyle M. Carter, Richard H. Garber, Eric A. Rechel, William R. Detar
Regrowth And Yield Of Alfalfa As Influenced By Wheel Traffic, Burl D. Meek, Lyle M. Carter, Richard H. Garber, Eric A. Rechel, William R. Detar
William R DeTar
Wheel traffic from equipment used to harvest alfalfa reduces yields because of crown damage and soil compaction. As much as 70% of the soil surface may receive wheel traffic during a single harvest.
Travel Time For Chemicals In An Irrigation System, William R. Detar
Travel Time For Chemicals In An Irrigation System, William R. Detar
William R DeTar
When a chemical is injected into an irrigation system, the length of time it takes to reach the end of the longest path can have a large effect on the uniformity of distribution of the chemical in the field. In trickle irrigation systems, the time to travel this path is also the minimum time before the end of the cycle at which system maintenance chemicals should be injected. In the case where wastewater is being applied to land through an irrigation system or where an injected chemical would cause damage to the piping if it were to remain in the …
Trickle Irrigation Vs. No-Irrigation Of Five Horticultural Crops In Pennsylvania, William R. Detar, David F. Kibler, D. W. Grenoble, R. Daniels, R. H. Cole
Trickle Irrigation Vs. No-Irrigation Of Five Horticultural Crops In Pennsylvania, William R. Detar, David F. Kibler, D. W. Grenoble, R. Daniels, R. H. Cole
William R DeTar
IN humid regions, the question of whether one should irrigate often overshadows problems such as selecting the proper system or scheduling procedure. To show whether it pays to irrigate by running irrigation experiments in the field is a long, expensive process. It would take perhaps five to ten years to determine significant relationships. The approach used in this project was to set up a computer model relating crop yields to weather data and moisture stress, and then verify the model at a few points using field experiments. This first report on the project includes only the field procedures and yields.
The Removal Of Fluorine From Wet Process Phosphoric Acid, Fathi Habashi
The Removal Of Fluorine From Wet Process Phosphoric Acid, Fathi Habashi
Fathi Habashi
Fluorine (and silicon) can be removed from technical phosphoric acid (30% P205) and recovered quantitatively as a by-product by adding a sodium or a potassium salt preferably the carbonate and boiling for a few minutes. The corresponding fluorosilicate precipitate, e.g. 2Na+ + SiF6- → Na2SiF6 can be separated by filtration. If this procedure is followed, no precipitation will take place in the evaporators during concentration of acid to 40% P2O5.