EFFECT OF SOIL pH ON THE PHYTOTOXICITY OF SIMAZINE TO STRAWBERRIES

Leefe, J. S.

doi:10.4141/cjps68-082

Cited by 9 publications

(4 citation statements)

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“…Adsorption of the s-triazines by soil colloids is dependent on the pH of the system, and many studies (4,5,8,9,10) have shown less phytotoxicity of the s-triazine under acid condi tions. This increased adsorption of various s-triazines by clay or organic matter has been considered the result of protonation of the basic molecule (1,2,3,7,10).…”

Section: Introductionmentioning

confidence: 99%

Effect of pH on Metribuzin Activity in the Soil

1976

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Metribuzin [4-amino-6-tert-butyl-3-(methylthio)-as-triazine-5(4H)one] applied preemergence resulted in increased phytotoxicity with increasing soil pH. In the field, fall panicum (Panicum dichotomiflorumMichx.) control, number of dead corn (Zea maysL.) and soybean [Glycine max(L.) Merr.] plants, and crop injury ratings increased, and plant height and grain yield decreased as the soil pH increased. In the greenhouse, corn and soybean grown in soil showed decreased dry weights due to metribuzin as pH increased. By contrast, the pH response to metribuzin was not evident in nutrient-sand culture, indicating that, in soil, pH affected the availability of metribuzin for plant absorption.

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Section: Introductionmentioning

confidence: 99%

Effect of pH on Metribuzin Activity in the Soil

1976

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“…3); thus the margin of crop tolerance would be greater in soils with a lower pH. Further work is necessary to determine how carrot growers should be advised to use metribuzin with respect to soil pH, as in the case of simazine use in strawberry in Atlantic Canada (Leefe 1968).…”

Section: Field Experiments Crop Tolerancementioning

confidence: 99%

Response of processing carrot to metribuzin on mineral soils in Nova Scotia

Jensen¹,

Doohan²,

Specht³

2004

Can. J. Plant Sci.

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. 2004. Response of processing carrot to metribuzin on mineral soils in Nova Scotia. Can. J. Plant Sci. 84: 669-676. Metribuzin was examined as an alternative to linuron and prometryn when prometryn-treated processed carrot in Atlantic Canada in the 1990s could not be exported to the United States, where prometryn was not registered for this crop. Field studies demonstrated that 280 g ha -1 metribuzin applied after the three-leaf crop stage resulted in only minor injury and no yield loss for both a metribuzin-tolerant (Caro-Choice) and -sensitive (Dominator) cultivar. Metribuzin applied either pre-or postemergence controlled two Matricaria species, chickweed [Stellaria media (L.) Vill.] and shepherd's-purse [Capsella bursa-pastoris (L.) Medik.], equivalent to approved prometryn and linuron treatments. Controlled environment studies were conducted to examine the effect of crop growth stage, temperature and soil pH on metribuzin injury to carrot. Differential tolerance between the two cultivars occurred only up to the three-leaf stage. Under controlled environment conditions, carrot injury to metribuzin increased threefold as soil pH increased from 6.5 to 7.4. There was little injury when metribuzin was applied postemergence under cool temperatures (15/10°C), but injury increased from 25 to 85% under 20/15°C and 30/25°C regimes. Lower temperatures and naturally low pH soils contribute to carrot tolerance to metribuzin under Nova Scotia conditions. Based on this research, metribuzin at 280 g ha -1 applied after the three-leaf stage of carrot was approved for use in the Atlantic provinces. Medik.] comme le font la prométryne et le linuron. Les auteurs ont effectué des études en milieu contrôlé pour vérifier les effets du stade de croissance, de la température et du pH du sol sur les dommages que la métribuzine cause à la carotte. La différence entre les deux cultivars au niveau de la tolérance ne se manifeste que jusqu'au stade de la troisième feuille. En milieu contrôlé, le relèvement du pH du sol de 6,5 à 7,4 triple les dommages imputables à la métribuzine. L'application du pesticide après la levée par temps frais (15/10°C) entraîne peu de dommages, mais ceux-ci augmentent de 25 % à 85 % aux températures de 20/15°C et de 30/25°C. Une température plus basse et un faible pH naturel du sol concourent à accroître la tolérance de la carotte à la métribuzine dans les conditions normales en Nouvelle-Écosse. Compte tenu de ces résultats, on a approuvé l'application de 280 g de métribuzine par hectare au stade de la troisième feuille de la carotte dans les provinces de l'Atlantique.

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“…The effect of pH on herbicidal activity, either in conjunction with liming or not, has received some attention in recent years. Thus in Canada, simazine injured strawberries more after liming (Leefe, 1968), and Nearpass (1965) found deeper penetration and reduced decomposition of simazine in limed than unlimed soil.…”

Section: Introductionmentioning

confidence: 94%

The phytotoxicity of various herbicides in two sandy loam soils and the effect of liming

Richardson

Banting

1977

Weed Research

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Summary: The phytotoxicity of five soil‐acting herbicides was investigated in two sandy loam soils and that of a further five herbicides in one of these soils. The effect of liming on phytotoxicity was also examined. Metoxuron, fenuron, metribuzin and fluometuron were more active in Boddington Barn soil than in Bledington soil. Prometryne was similar in effect in both soils. Liming significantly increased the effect of metoxuron in Boddington Barn soil and metoxuron, atraton, difenoxuron and metribuzin in Bledington soil. Monolinuron was less toxic in limed Bledington soil. Reasons for these differences have not been determined.

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EFFECT OF SOIL pH ON THE PHYTOTOXICITY OF SIMAZINE TO STRAWBERRIES

Abstract: not available

Cited by 9 publications

References 0 publications

Effect of pH on Metribuzin Activity in the Soil

Effect of pH on Metribuzin Activity in the Soil

Response of processing carrot to metribuzin on mineral soils in Nova Scotia

The phytotoxicity of various herbicides in two sandy loam soils and the effect of liming

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