Broadcast or Banded Atrazine plus Propachlor with Tillage Variables in Corn

Abstract

The herbicide mixture 2-chloro-4-(ethylamino)-6-(isopropylamino)-s-triazine (atrazine) + 2-chloro-N-isopropylacetanilide (propachlor) was applied preemergence broadcast and in band widths of 18, 36, and 53-cm to corn (Zea maysL.). All herbicide treatments were applied as 1.1 kg of atrazine + 2.7 kg of propachlor per treated hectare. One row-middle cultivation and one rotary hoeing were also imposed on the herbicide treatments as variables. The 18-cm band of atrazine + propachlor with supplementary cultivation was as effective in controlling weed growth and maintaining corn yield as were wider herbicide bands or a broadcast treatment. Broadcast treated corn without row-middle cultivation produced significantly less grain than the handweeded check both years of the experiment. The average ratio of weed dry weight to reduction in corn yield was 0.8 to 1. Cultivation of row middles reduced average end-of-season weed yields 80%. Cultivator effectiveness on an 18-cm herbicide band equalled that measured on wider herbicide bands. Rotary hoeing reduced early season weed yields 82 and 38% in 1970 and 1971, respectively.

Interrow Cultivation to Reduce Herbicide Use in Corn following Alfalfa without Tillage

“…However, two cui-Annual Annual Perennial species broadleaf weeds grass weeds 1988-1989 1988-1989 1988-1989 tivations were needed to control annual grass weeds under the same conditions. Two cultivations have also provided optimum weed control following reduced herbicide applications in conventional tillage systems (Buhler et al, 1992;Gunsolus, 1990;Moomaw and Robison, 1973).…”

Weed Control and Potato (Solanum tuberosum) Yield with Banded Herbicides and Cultivation1

“…For example, a 25-cm spray band applied to a crop with 75-cm row spacing would result in a two-thirds reduction in herbicide use. Several studies have shown that between-row cultivation combined with herbicides banded over the crop row and covering one-fifth to one-third of the land can result in field corn (Zea mays L.) yield and weed control comparable to the use of broadcast herbicides without cultivation (Gill et al 1984;Moomaw and Robison 1973;Mt. Pleasant et al 1994;Samson and Coulman 1989).…”

Cultivator Design for Interrow Weed Control in No-Till Corn

“…During 1970 and 1971 in Nebraska, Moomaw and Robinson (1973) compared broadcasting with banding of herbicide when combined with rotary hoeing and cultivation. The data indicated that yield with an 18-cm (7-in.)…”