They should be placed in the lowest part of the field at ground level. Temperature sensors are available which range from inexpensive max/min thermometers to digital units that will sound an alarm once the critical temperature is reached. Consult an irrigation specialist or engineer to design the best system for your field. Big gun irrigation systems are not suitable for frost protection. A higher density of sprinkler heads and a faster rotation of the heads are required for frost protection, compared to a system used only for irrigation. Frost protection requires that the irrigation system is able to maintain a surface film of water on the plant at all times.
The irrigation system must be designed for frost protection. The LST value was the lowest temperature that a particular tissue stage could withstand without any injury to the plant. Tissue was examined on both the surface and inside for injury from the temperature. He put blueberry flower buds in a freezer and lowered the temperature at a rate of 7.2☏ per hour when the tissue at the flower bud surface reached the target temperature, they were removed. Paul Cappiello who was an Associate Professor of Horticulture at the University of Maine. The lowest safe temperature (LST) tolerances, listed on the front page, were determined by Dr. Temperature tolerance given is the lowest safe temperature LST in degrees Fahrenheit (☏)įrost Protection Using Irrigation Systems
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