A Variable Dosage Sprayer for Agricultural Experiments

Abstract

THE present method for testing in the field the toxicity and selectivity of herbicides or other spray chemicals necessitates spraying a number of separate plots with different dosages. Valuable time is wasted in making up solutions and emptying the spraying machine between operations. The time required is longer the closer the gradations of dosage which it is considered necessary to examine. We have designed a machine which makes it possible with one filling to spray continuously decreasing concentrations, starting from an arbitrary upper limit. A whole spectrum of results is thus made available for examination in far less time than is consumed in getting less complete results by the established method.