TRIALLATE HERBICIDE APPLICATION WITH DRY AND SOLUTION NITROGEN FERTILIZERS

Abstract

Field and laboratory experiments were conducted to determine the efficacy of triallate herbicide and the availability of nitrogen (N) in joint applications of triallate plus N. Triallate did not affect the conversion of urea to NH4- and NO3-N. The concentration of triallate in solution was not altered by NH4-N at initial concentrations up to 1400 μg NH4-N/g of soil. In the field, spring applications of triallate in all of the granular forms resulted in reduced wild oat control compared to triallate in the emulsifiable concentrate (EC) form. Triallate coated on urea or NH4NO3 gave wild oat control similar to that obtained with commercial 10 G granules. Fall treatments resulted in similar wild oat control for all methods of triallate application. Combined and separate applications of triallate and N fertilizer produced similar wheat yields as long as the wild oat control was similar. The results indicate that triallate can be applied with solution N fertilizer in both spring and fall and with dry N fertilizer in the fall.