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Enhanced Phytotoxicity of Atrazine-Phosphate Combinations

Published online by Cambridge University Press:  12 June 2017

C. F. Stolp and
Donald Penner
C. F. Stolp
Affiliation:
Dep. of Crop and Soil Sci., Michigan State Univ., E. Lansing, Michigan, 48823
Donald Penner
Affiliation:
Dep. of Crop and Soil Sci., Michigan State Univ., E. Lansing, Michigan, 48823
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Abstract

Soybean [Glycine max (L.) Merr.] seedlings grown in the greenhouse in a Wisner loam soil showed a greater reduction in plant growth from an application of 2-chloro-4-(ethylamino)-6-(isopropylamino)-s-triazine (atrazine) if fertilized with 224 kg/ha of P2O5. This interaction was not observed in tolerant corn (Zea mays L.) seedlings in any of the four soils studied. The injury in sand culture of high levels of atrazine to soybean, corn, pea (Pisum sativum L.), and sorghum (Sorghum vulgare L.) seedlings increased when high levels of P (phosphorus) were present. The high level of P did not increase atrazine uptake, and in corn atrazine did not increase 32P uptake. Plants receiving the atrazine-phosphate combination exhibited a higher rate of respiration providing a possible basis for the observed interaction. The high rate of P application slightly reduced atrazine metabolism by corn and pea but not by soybean and sorghum.

Information

Type
Research Article
Information
Weed Science , Volume 21 , Issue 1 , January 1973, pp. 37 - 40
Copyright
Copyright © 1973 Weed Science Society of America 

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References

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