Influence of Application Method on the Activity of Butylate and EPTC in Reduced-Tillage Corn (Zea mays)

Abstract

Weed control in reduced-tillage corn (Zea maysL. ‘Pioneer 3732′) with butylate [S-ethyl bis(2-methylpropyl) carbamothioate] and EPTC (S-ethyl dipropyl carbarnothioate) was not reduced when these herbicides were applied jointly with dry or liquid fertilizer. In most cases, application with fertilizer resulted in weed control similar to that observed when the herbicide was applied in water at 285 L/ha. Butylate applied as a granular formulation also gave weed control similar to the spray at 285 L/ha. Application in 95 L/ha of water consistently resulted in reduced weed control. Corn injury was not greatly influenced by application method, and differences in corn yield appeared to be due to differences in weed control. Growth chamber bioassays indicated that both butylate and EPTC dissipated more rapidly when applied in 95 L/ha of water than the other application methods, which may explain differences in weed control observed in the field.

Rice (Oryza sativa) Response to Clomazone plus Bensulfuron and Halosulfuron1

“…Herbicide-impregnated granular fertilizers have been used successfully in several crops (Braverman 1995;Buhler 1987;Martin et al 1989). In 1993, 43,300 ha of various crops were treated in Wisconsin with herbicideimpregnated fertilizers (Rabaey and Harvey 1994).…”

“…In 1993, 43,300 ha of various crops were treated in Wisconsin with herbicideimpregnated fertilizers (Rabaey and Harvey 1994). Buhler (1987) compared weed control with EPTC and butylate applied with 95 and 285 L/ha of water to EPTC and butylate impregnated onto dry fertilizer (0-0-60 [N-P-K]) applied PRE to no-till corn. There was no reduction in redroot pigweed (Amaranthus retroflexus L.), velvetleaf (Abutilon theophrasti Medik.…”

Herbicides Impregnated Onto Granular Fertilizer Carriers for Broadleaf Weed Control in Winter Wheat (Triticum aestivum)

“…Bushy wall-11ower, henbit, and wild buckwheat (PolygollU111 convolvulus L.) are among the top ten most common weeds in wheat in OklaholTIa (5). An estimated one Inillion hectares of wheat in Oklahonla annually receive an application of herbicides, prilnarily sulfonylurea herbicides, for broadleaf weed control 4 • The primary objective of these herbicide applications is to have weed-free fields at harvest and not to increase yield ( II). Yield increases due to broadleaf weed control are atypical, but weeds often interfere with harvest ( 11,12).…”

“…When granular fertilizer or anhydrous ammonia is used in wheat, herbicide application requires an additional field operation. If the herbicide could be applied with granular fertilizer, then wheat growers who wanted to apply both herbicide and fertilizer could save one trip across the field (4).…”

“…Herbicide-impregnated granular fertilizers have been used successfully in several crops (1, 3, 4, 7, 8, ]3). In rice (Oryza sativa L.), granular fertilizer was frequently the best carrier for bensulfuron {2 [[( [[(4,6- water (4). However, no research has been conducted in Wheat to determine whether chlorsulfuron and triasulfuron can control broadleaf weeds when applied with granular fertilizer carrier.…”