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- Title
Field experiments to investigate long-term effects of repeated applications of MCPA, tri-allate, simazine and linurom: ll. Crop performance and residues 1969-78.
- Authors
Fryer, J. D.; Smith, P. D.; Hance, R. J.
- Abstract
In four field experiments begun in 1963, each of four herbicides was applied to plots planted with the same crop each year. The annual treatments were: MCPA at 1·7 kg/ha to barley (<em>Hordeum sativa</em> Jess) and wheat (<em>Triticum aestivum</em> L.) at growth stage 15, tri-allate at 1·7 kg/ha pre-emergence to barley and wheat, simazine at 1·7 kg/ha pre-emergence to maize (<em>Zea mays</em> L.) and linuron in two applications of 0·84 kg/ha pre- and post-emergence to carrots (<em>Daucus carota</em> L.). MCPA did not affect growth or yield of either barley or wheat. In general tri-allate also did not affect the crops although wheat yield was depresssed in I978, wheat 1000 grain weight was reduced in 1972 and barley germination percentage was increased in 1973. Simazine did not influence the height, yield or appearance of maize. Linuron normally produced no effect on carrot yield, density and size. However, in 2 years when the post-emergence application was late, density but not yield was lower than in control plots. There was no accumulation of residues of any of these compounds in the soil. Rates of loss were similar to those predicted on the basis of laboratory experiments. In a fifth experiment these herbicides were applied twice per year (3 times in the case of linuron) at double the rates above on each occasion to bare plots. These applications ceased in 1968 (1969 for MCPA) but residues were monitored until 1972 except in the case of MCPA. Disappearance rates were similar to those in the cropped plots and residues were largely confined to the top 10 cm. The plots treated with MCPA had developed an enhanced ability to degrade it prior to 1968, This persisted for 5 years after the final application.
- Subjects
HERBICIDES; MCPA (Herbicide); BARLEY; CORN; WHEAT; AGRICULTURAL experimentation
- Publication
Weed Research, 1980, Vol 20, Issue 2, p103
- ISSN
0043-1737
- Publication type
Article
- DOI
10.1111/j.1365-3180.1980.tb00052.x