A comparison of controlled drop and conventional application of three soil-applied herbicides to an organic soil

May, M.J.; Ayres, P.

Proceedings, Symposium on Controlled Drop Application, Reading University, 1978 Monograph 22): 157-161

1978


Accession: 000269450

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Abstract
Linuron, chlorpropham and simazine, each at 2 sub-lethal rates, were used for pre-em. weed control on an organic soil. Each rate was applied in 6 volumes of spray liquid up to 640 litres/ha. The 2 lowest volume rates (20 and 40 litres) were applied using a controlled drop applicator; the others, 80, 160, 320 and 640 litres, were applied with conventional hydraulic nozzles. The reduction in the overall weed populations and of Matricaria matricarioides by all herbicides was similar for controlled drop and the higher conventional volume applications. There were also no differences between volume rates for linuron and chlorpropham on Polygonum lapathifolium and linuron on Chenopodium album. Only with the remaining comparisons did the method of application affect the performance of the herbicides. Chlorpropham and simazine were less effective on C. album when sprayed with a controlled drop applicator and simazine tended to be more effective against P. lapathifolium at the lower volumes.