1998 - Volume #22, Issue #4, Page #6
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Sensor-Controlled Fertilizer Spreader
A new dry fertilizer spreader varies the rate of application by "reading" the color of the crop with special sensors that tell the machine how much nutrient the crop needs.
Sensors mount on arms off to either side of the machine. They're able to actually determine the amount of chlorophyll content in the leaves. ..........


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1998 - Volume #22, Issue #4