Re: Cotton versus Herbicide Question

Posted by Burnie on July 16, 2007 at 21:58:58 from (203.25.140.97):

In Reply to: Cotton versus Herbicide Question posted by Howard H. on July 15, 2007 at 19:48:22:

A 20 mile drift would not surprise me at all. Drifts of this type are usually caused by some one spraying in what is known as a temperature inversion. Normally, air tempature will decrease the higher it is above the surface of the earth. However, during periods of hot days and still, cool nights (eg,late summer and early fall) a layer of cold air near the earth's surface will get trapped under a warmer layer. Inversions tend to form in the evening, are strongest around dawn and break down by mid morning. If you drive down a dirt road on a still summer evening you, may see your dust trail just hanging above the road instead of blowing away or falling back to the ground. The dust particles are suspended in the cold dense air and are trapped under the higher warmmer layer. If you are spraying under these conditions, small spray droplets get suspended in the same manner. They can stay this way until the inversion is dispersed by the morning breeze. Because the chemical droplets can be suspended up to 40ft above groundlevel they can be blown a great distance before dropping to the ground. If that ground happens to have cotton growing on it, then you have a bit of a drama on your hands. As we all know, cotton has only got to get a wiff of 24D and it will start to curl up it's toes. Inversions will not form if there is any wind, so that is one of the reasons that you should spray in a slight breeze. 24D hits on cotton is a big problem where I am, nowdays more and more farmers observe a self imposed ban on 24D during the cotton growing season.

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