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- Title
RESIDUAL ACTIVITY OF PARAQUAT IN SOILS II. ADSORPTION AND DESORPTION.
- Authors
Watkin, E. M.; Sagar, G. R.
- Abstract
Glasshouse studies showed that low doses of paraquat inhibited the germination of <em>Lolium perenne</em> L. broadcast directly onto the paraquat-sprayed surfaces of a sphagnum and a peat soil, but that higher doses were necessary to produce phytotoxic symptoms on mineral soils, a compost and a loam. On all soils residual activity increased rapidly with increasing dose once the minimum phytotoxic dose was reached. On a sandy soil, residual activity increased almost linearly from the lowest to the highest dose applied. At 9.0, 4.5 and 2.24 kg/ha phytotoxicity on a compost was not affected by changes in the volume of application, but at 1.68 kg/ha and lower, reducing the volume from 562 1/ha to 281 and 112 1/ha resulted in increased phytotoxicity. Phytotoxic residues were eluted from paraquat-treated compost surfaces by percolating de-ionized water up soil columns but residual activity was not removed from the eluted surfaces. Surface irrigation of paraquat-treated surfaces with water previously percolated through columns of untreated soil reduced residual activity by 45%.
- Subjects
PARAQUAT; LOLIUM perenne; PEAT soils; SOILS; BIPYRIDINIUM compounds; HERBICIDES
- Publication
Weed Research, 1971, Vol 11, Issue 4, p247
- ISSN
0043-1737
- Publication type
Article
- DOI
10.1111/j.1365-3180.1971.tb01007.x