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Tank Mixing Foliar Fungicides and Liquid Nitrogen
Foliar Fungicides and Foliar N: Interest in application of foliar N to enhance wheat proteins has resulted in questions about tank mixing with foliar fungicides. Studies on foliar N application (without added fungicide) by Greg Endres and Blaine Schatz at the Carrington station and by John Wiersma at the Crookston, MN station have indicated that foliar nitrogen should be applied shortly after flowering, to avoid injury to the flower and for better uptake of the nitrogen into the grain. Application after flowering rules out the use of Tilt fungicide as a tank mix partner. Tank mixing of mancozeb fungicide and 28-0-0 was tested at NDSU some years ago by Ed Vasey and results indicated that leaf burn was severe if a surfactant was added to this tank mix. Leaf burning also was compounded if temperatures at spraying were greater than 90 F. The Carrington study and the Crookston study also indicated leaf burn was less using 20-0-0-3 than with 28-0-0. The purpose of applying fungicides is to protect the leaf from diseases and any practice that burns the leaves negates the purpose of adding the fungicide.
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