PENETRATION OF AND PERSISTENCE IN SOIL OF THE HERBICIDE 2-CHLORO-4,6-BIS (ETHYLAMINO)-S-TRIAZINE (SIMAZINE)

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Abstract
A study was made of the soil penetration and persistence of Simazine, applied in May, 1958, to a fallow soil at rates ranging from 0.5 to 20 lb./ac. (active). Residual concentrations at 0–1 inch, 1–2 inches, 2–4 inches, 4–6 inches, and 6–8 inches, were determined by chemical analysis.At the time of the final 1958 sampling (96 days after application) it was found that a much greater proportion of the Simazine was present in the lower layers in those plots receiving the lighter applications than in those plots receiving the heavier applications, where most was still concentrated in the 0–1 inch layer. However, 1 year after application this trend was much less marked. At that time the average distribution among the 0–1, 1–2, 2–4, 4–6, and 6–8 inch layers was 64.1 per cent, 19.1 per cent, 14.5 per cent, 1.7 per cent, and 0.6 per cent, respectively. Two years after application the greatest concentration of Simazine was still in the 0–1 inch layer. In general, the total of the combined amounts present in the second and third layers was approximately equal to the total of the amounts present in the 0–1 inch layers. Very little was present in the two lower layers.At the time of the final first season sampling an average of 34.9 per cent of the applied Simazine was still present; but, by the end of the first year this value had dropped to 8.3 per cent, and by the end of the second year the average percentage present was only 2.7 per cent.

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