Abstract
A field study was conducted on the application of herbicides via drip irrigation systems. The parameters studied were the rate and frequency of water application. Two herbicides were examined: bromacil — readily soluble and mobile in soils, and napropamide — with low solubility and only slight mobility. Application of these compounds in the field indicated that an increased water application rate results in greater lateral movement. After several weeks of irrigation, surface concentrations of both compounds were found at 30–50 cm from the emitter. Daily irrigation resulted in greater surface accumulation than weekly irrigation, where accumulation deep in the soil profile was found to occur.
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