Missouri Agricultural Weather

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LIVESTOCK INDICES AND EVAPOTRANSPIRATION EXPLANATIONS

Livestock advisories are made on the basis of the expected temperature and
humidities.  High humidities associated with warm temperatures produce heat
stress for animals.  The danger category indicates stress to animals in
confinement.  Attention should be given for proper ventilation and minimal
handling or transportation of livestock.  The emergency category indicates
that every means available should be used to reduce the heat stress on the
animal (shade, ventilation, plenty of drinking water, etc.)  DURING THE
EMERGENCY PERIOD THERE IS A HIGH RISK OF DEATH.  (Professor W. Decker)

Evapotranspiration is the equivalent depth of water vaporized by evaporation
from the soil surface plus transpiration from a plant canopy.  A "well
watered" condition refers to irrigated fields or fields after a substantial
rain.  If the soil water reserve is near 50% of its maximum, the estimated
evapotranspiration should be reduced by multiplying the well watered estimate
by .8.  If the soil is drier than 50% of its maximum, the evapotranspiration
may be estimated by multiplying by .6.  A farmer can keep track of the water
balance in the soil by subtracting the evapotranspiration from the rainfall.
(Prof. W. Decker)

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