Effects of application method on the performance of some soil‐applied herbicides. I. Glasshouse experiments

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Abstract
Summary: Chlortoluron, propyzamide, terbutryne and nitrofen were applied to the soil in pots with a rotary atomizer at 301 ha−1, with a conventional hydraulic nozzle at 400 1 ha−1 at several doses, or as discrete 2‐μl drops applied with a microsyringe at 2‐cm spacings. The test plants were Alopecurus myosuroides, Stellaria media, Chenopodium album, Avena fatua, perennial ryegrass and radish. Chlortoluron, propyzamide and terbutryne had the same activities following the rotary atomizer or conventional spray application but the rotary atomizer application of nitrofen was less effective against A. fatua than the conventional spray treatment. Chlortoluron, propyzamide and terbutryne showed appreciable activity applied as drops 2 cm apart at rates equivalent to 2 kg ai ha−1, on plants growing equidistant from the drops, but nitrofen showed no activity under these circumstances.The activity of chlortoluron was investigated at different soil moisture contents; it was more active when applied to moist soil than to dry soil which was not wetted for at least 10 h. Application method did not affect this response