Apparatus and method for spraying herbicide on weeds in a cotton field

Weeds growing around the bases of the stalks of cotton plants growing in a row in a cotton field are sprayed with herbicide without spraying the cotton stalks or wasting herbicide on bare ground. The cotton plants are adequately mature that their stalks exhibit a significantly different spectral reflectance characteristic than the weeds typically growing amid the cotton. The cotton plants are adequately tall that the majority of the leaves of the cotton plants are disposed outside the area which can be sprayed using an electronically-controlled valve and nozzle. Light is transmitted toward an object (a cotton stalk, a weed, or soil) in the row and the reflected light is analyzed. If the object has a spectral characteristic of a growing weed, then the valve is activated and the object is sprayed with herbicide. If the object does not have the spectral characteristic of a growing weed (such as the spectral characteristic of a woody cotton stalk or of soil), then the valve is not activated and the object is not sprayed with herbicide.