Apparatus and method for spraying herbicide on weeds in a...

A - Human Necessities – 01 – M

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A01M 7/00 (2006.01) A01C 23/00 (2006.01) G01N 21/25 (2006.01)

Patent

CA 2250889

Weeds (100) growing around the bases of the stalks of cotton plant (101) growing in a row (105 and 105A) in a cotton field are sprayed with herbicide without spraying the cotton stalks (101) or wasting herbicide on bare ground (107). 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 (103). 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, then the valve is not activated and the object is not sprayed with herbicide.

On pulvérise un herbicide sur des mauvaises herbes (100) poussant au pied des tiges d'un plant de coton (101) se développant dans une rangée (105 et 105A) d'un champ de coton sans en pulvériser sur les tiges (101) ou sans en gaspiller sur le sol vierge (107). Les plants de coton sont arrivés à maturité lorsque leurs tiges présentent une caractéristique de réflectance spectrale bien différente de celle des mauvaises herbes poussant généralement dans le champ de coton. Les plants de coton sont suffisamment hauts pour que la majorité des feuilles se trouvent à l'extérieur de la zone pouvant être pulvérisée au moyen d'une vanne et d'un ajutage à commande électronique (103). La lumière est transmise vers un objet (tige de coton, mauvaise herbe ou sol) dans la rangée et la lumière réfléchie est analysée. Si l'objet a la caractéristique spectrale d'une mauvaise herbe, la vanne est alors activée et l'objet pulvérisé d'herbicide. Si l'objet n'a pas la caractéristique spectrale d'une mauvaise herbe, la vanne n'est pas activée et l'objet n'est pas pulvérisé d'herbicide.

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