Besides feeling the soil and sniffing the air, farmers can now point gun shaped infrared meters at their crops in order to discover when the plant; need watering. These portable meters give digital readouts that indicate th< difference between a plant's temperature and that of the surrounding air When it is short of water, a plant, which normally uses evaporation as ; means of cooling, cannot rid itself of the heat it absorbs from sunlight on the heat that may build up from its own metabolism. Hence, if the mete: indicates that a plant is warmer than the air, it may mean that it is time tc irrigate.
Besides feeling the soil and sniffing the air, farmers can now point gun shaped infrared meters at their crops in order to discover when the plant; need watering. These portable meters give digital readouts that indicate th< difference between a plant's temperature and that of the surrounding air When it is short of water, a plant, which normally uses evaporation as ; means of cooling, cannot rid itself of the heat it absorbs from sunlight on the heat that may build up from its own metabolism. Hence, if the mete: indicates that a plant is warmer than the air, it may mean that it is time tc irrigate.
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