Nalco-trol

Figure 11. Evaporation rate of water droplets from solutions containing Nalco-Trol.

Another use of anti-drift additions to sprays is in the controlled direction of the spraying. In the control of johnson grass, redroot, pigweed, and hemp sesbania in soybeans sprays were directed across the rows to catch the higher weeds in June, July, and August. The anti-drift polymer at 0.1% in the spray balanced the increased effectiveness through the use of surfactants in the formulation. The Nalco-trol polymer consisted of a long chain polymer that thickened water and eliminated the production of spray droplets smaller than 200 microns. 

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