Irrigation as a Tool for Frost and Freeze Protection Essay -- Agricult

For years now farmers and researchers have understood the value of applying urine to crops during periods when the temperature drops at a lower place 32oF (0oC). The temperature of 32oF is the freezing pass of water and is the temperature at which crops start to vex damaged due to the formation of ice crystals in their tissue cells. The point that this starts to occur is considered the crops critical temperature. The critical temperature usually is slightly lower than the freezing point of water and depends on the duration at the temperature. For example, in citrus the critical temperature at quartette hours is 28oF. This means that a citrus channelise can stand a temperature of 28oF for four hours before sustaining damage. After four hours the damage is proportional to the time that the temperature remains below the critical temperature. Temperatures below 28oF for a short period of time (one or two hours) leave alone cause only minimal damage. Temperatures over 28oF can be tolerated for wide periods of time with only minor damage (partial leaf burn, partial defoliation, etc., unless no wood damage). Other factors such as stage of ontogeny (if the imbed is in early stages of growth or mature), fruit localise (whether the crop is still on the fix or not), dormancy (whether the plant is actively growing or is dormant), plant water content (whether the plant is under water stress or not) and overall plant wellness will influence the critical temperature for a specific crop. There atomic number 18 three ways that water can transfer heat for hoar protection. The first way is through radiation. Water pumped from wells will be introduced into the field at a much higher temperature than the touch air temperature (in Florida the temperature for water coming from a well is... ...rmittent coverage. ReferencesHochmuth, G.J., S.J. Lacascio, S.R. Kostewicz, and F.G. Martin. 1993. Irrigation Method and Rowcover persona for Strawberry rime Protection. J. Amer. Soc. Hort. Sci. 188(5)575-579. Miller, F. 1977. College Physics. Harcourt Brace Jovanovich, Inc. New York. Parsons, L.R., and T.A. Wheaton, 1987. Microsprinkler Irrigation for Freeze Protection evaporative Cooling and Extent of Protection in an Advective Freeze. J. Amer. Soc. Hort. Sci. 112(6)879- 902. Parsons, L.R., T.A. Wheaton, N.D. Faryna, and J.L. Jackson. 1991. Elevated Microsprinklers reform Protection of Citrus Trees in an Advective Freeze. Hortscience. 26(9)1149-1151. Rieger, M., F.S. Davies, and L.K. Jackson. 1986. Microsprinkler Irrigation and Microclimate of Young Orange Trees During Freeze Conditions. Hortscience. 21(6)1372-1374.