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Definitions: Dry-bulb temperature: the temperature of the air as measured with a thermometer. Wet-bulb temperature: the temperature that the tree will likely sense due to evaporative cooling of the leaves. Dew point temperature: the air temperature required for condensation (dew or frost) to occur.
Many chemicals and some bacteria have been tested to induce frost tolerance of citrus, avocado and other horticultural crops. In some trials, protection of a few degrees has been achieved, but more commonly, the results have been variable or not commercially successful.
How Frosts and Freezes Occur Before considering the methods of frost protection, one should understand the conditions under which low temperatures occur. To differentiate between the two major sources of the cold, the terms local radiation frost and freeze are used.
The oldest analysis terminology is weight per weight; e.g. 55 weights of calcium per weight of soil, standardized on a million weight of soil, tissue or water or parts per million (ppm).
A crucial aspect to microsprinkler and dropper performance is maintaining the size of the orifice as it was delivered from the factory. Even small changes in the size of the orifice can have significant effects on the volume of water distributed in the orchard.
The use and misuse of the term ET (evapotranspiration) has become pronounced with the current water shortage and a brief review of the term seems timely. In short, ET is the amount of energy arriving at a site that drives water loss.
