Response of Weeds and Soybeans to Amiben and Naptalam Individually and in Mixtures with Dinoseb

Abstract

On Tifton loamy sand, N-1-naphthylphthalamic acid (naptalam) controlled weeds much better, and injured soybeans [Glycine max (L.) Merr.] much less, when mixed with 2-sec-butyl-4,6-dinitrophenol (dinoseb) and applied as a delayed preemergence treatment, than when it was applied alone immediately after planting. Differences attributable to either timing of application or to mixing with dinoseb were not as marked for 3-amino-2,5-dichlorobenzoic acid (amiben) as for naptalam. Neither amiben, naptalam, nor mixtures of these two herbicides with dinoseb adversely affected germination, weight per seed, or total oil and protein content of the harvested soybean seed.