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The routine use of pesticide tank mixtures has increased the importance of formulation tank mix compatibility. Unfortunately, compatibility is very sensitive to the mixing and spraying conditions. Consequently, incompatibility occurs erratically in the field and is difficult to consistently reproduce in the laboratory. While compatibility in the field can never be totally predicted in the laboratory, the test method used in this work provides good predictions, while still allowing the testing of many combinations of pesticides and carriers with a reasonable effort.
It is known that the results of compatibility tests are dependent on the spray carriers used. It was not known whether tests with laboratory carriers would adequately predict field results. Therefore, samples of water and ammonium nitrate/urea liquid fertilizers were obtained from various parts of the United States and their effect on the compatibility of pesticide tank mixtures evaluated. Samples of nominally similar carriers gave very different compatibility results. The importance of using carriers which are representative of the ones used in the field when evaluating pesticide tank mix compatibility was confirmed.
compatibility, test method, tank mix, pesticide, formulation, liquid fertilizer, water
Senior Research Specialist, Monsanto Agricultural Company, A Unit of Monsanto Company, Saint Louis, Mo