AGR 2320 Lecture Notes - Lecture 34: Loam, Field Capacity, Evapotranspiration
5 Dec 2017
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Document Summary
Management of water: water budgets, excess water- drainage, water deficiency irrigation and salt problems. High value crop, even a little bit of water deficiency may affect a high value crop. Most of the water can run across the surface and not penetrate the soil. When trying to drain a field or irrigation we are talking about moving huge quantities of water. Evapotranspiration [ea]: actual amount of water lost by evaporation and plant transpiration. Potential evapotranspiration [pet]: amount of water that could be lost by evaporation and plant transpiration if water was always available. *on a very dry day, stomata close, evapotranspiration decreases. Get same amount of precipitation every month of the year. Evapotranspiration changes from the summer to the fall. When it is frozen there is no evapotranspiration (assumption from prof) Once excess water drains out in the spring we are at field capacity.
