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Published in Crop Sci 13:489-490 (1973)
© 1973 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Evidence for a Trifluralin-Potassium Nitrate Interaction Affecting Tomato Seedling Growth1

L. W. Barnes and D. R. Krieg2

The influence of various potassium nitrate (KNO3) concentrations on herbicidal activity of trifluralin ({alpha},{alpha},{alpha}-trifluoro-2,6-dinitro-N,N-dipropyl-p-toluidine) was investigated using hydroponically grown tomato (Lycopersicon esculentum Mill. cv. ‘Homestead 24’) seedlings. The treatments consisted of all combinations of 0.0, 0.5, and 1.0 mg trifluralin/liter and 0, 15, and 30 meq KNO3/liter added to the base nutrient solution. Treatment was initiated when the third true leaf began expanding and lasted for 1 week. The addition of trifluralin to the base nutrient solution reduced fresh weight, dry weight, leaf area, chlorophyll concentration, and photosynthetic rate. The addition of 15 meq KNO3liter to the herbicide treatments further reduced these same parameters when compared to the herbicide alone. The addition of 30 meq KNO3/liter to the herbicide treatments increased the growth of the seedlings to levels comparable to, or in excess of, the herbicide alone.

Key Words: Chlorophyll concentration • Herbicide • Leaf area • Photosynthesis • Respiration

1 Contribution of the College of Agricultural Sciences, Texas Tech. University. Part of a thesis submitted by the senior author in partial fulfillment of the requirements of an M.S. degree in Crop Science.

2 Former Graduate Research Assistant and Assistant Professor, Department of Agronomy, Texas Tech University, Lubbock, Texas 79409. Senior author is currently a Research Associate, Texas Agricultural Experiment Station, Texas A&M University Research and Extension Center, Lubbock, Texas.

Received for publication December 23, 1972.




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