+ Site Statistics
+ Search Articles
+ PDF Full Text Service
How our service works
Request PDF Full Text
+ Follow Us
Follow on Facebook
Follow on Twitter
Follow on LinkedIn
+ Subscribe to Site Feeds
Most Shared
PDF Full Text
+ Translate
+ Recently Requested

Effect of glyphosate application timing and row spacing on corn (Zea mays) and soybean (Glycine max) yields



Effect of glyphosate application timing and row spacing on corn (Zea mays) and soybean (Glycine max) yields



Weed Technology 18(1): 165-176



Corn and soybean were planted in narrow and wide row spacings to determine the effect of glyphosate application timing and row spacing on crop yield. Glyphosate was applied when average weed canopy height reached 5, 10, 15, 23, and 30 cm. Weeds present in these studies included velvetleaf, redroot pigweed, common ragweed, common lambsquarters, jimsonweed, barnyardgrass, fall panicum, giant foxtail, yellow foxtail, green foxtail, and eastern black nightshade. Under highly competitive growing conditions (below normal rainfall and high weed density), corn yield was first reduced when weeds reached 10 and 15 cm in height with corn planted in 38- and 76-cm rows, respectively. Under similar conditions, soybean yield was first reduced when weeds reached 15 and 23 em with soybean planted in 19- and 38-cm rows, respectively. Yield losses occurred only in the untreated control when soybean was planted in 76-cm rows. When growing conditions were less competitive (adequate rainfall and lower weed density), yield losses occurred only when weeds reached 30 cm or more in corn and only in the untreated control in soybean. Corn and soybean yields were higher when planted in narrow rows in three of 4 yr but were more susceptible to early season weed interference than corn and soybean in wide rows. Corn yield was affected more by weed interference than was soybean yield. The product of weed height by weed density, as the independent variable, resulted in the best linear fit for both corn and soybean yields. High weed densities increase the risk of yield loss and must be considered when determining the appropriate timing for total postemergence herbicide applications such as glyphosate. Sequential glyphosate applications in corn did not increase yield.

Please choose payment method:






(PDF emailed within 0-6 h: $19.90)

Accession: 066184377

Download citation: RISBibTeXText

DOI: 10.1614/02-150a


Related references

Effect of glyphosate application timing and row spacing on weed growth in corn (Zea mays) and soybean (Glycine max). Weed Technology 18(1): 177-182, 2004

Impact of glyphosate-resistant volunteer corn (Zea mays L.) density, control timing, and late-season emergence on yield of glyphosate-resistant soybean (Glycine max L.). Crop Protection 81: 38-42, 2016

Effect of carrier volume on corn (Zea mays) and soybean (Glycine max) response to simulated drift of glyphosate and glufosinate. Weed Technology 16(3): 587-592, 2002

Response of barnyardgrass (Echinochloa crus-galli) to glyphosate application timing and rate in glyphosate-resistant corn (Zea mays). Weed Technology 19(4): 830-837, 2005

Agricultural liming: its effect on soil fertility, plant nutrition, and yields Corn, soybean, Zea mays, Glycine max. National Conference on Agricultural Limestone Nashville Tennessee October 16-18-1980 sponsored by the National Crushed Stone Association et al: 9, 1981

Control of volunteer glyphosate-resistant corn (Zea mays) in glyphosate-resistant soybean (Glycine max). Weed Technology 20(1): 261-266, 2006

Effect of row spacing and herbicide application timing on weed control and grain yield in corn (Zea mays). Weed Technology 16(3): 548-553, 2002

Management of Amaranthus rudis S. in glyphosate-resistant corn (Zea mays L.) and soybean (Glycine max L. Merr.). Crop protection 26(9): 1436-1443, 2007

Effect of the cropping system on the yields of wheat, corn, and soybean grown on slightly calcareous chernozem Tillage, Triticum, Zea mays, Glycine max. Proceedings of the 9th Conference of the International Soil Tillage Research Organization ISTRO: 296, 1982

Effect of planting date, residual herbicide, and postemergence application timing on weed control and grain yield in glyphosate-tolerant corn (Zea mays). Weed Technology 16(3): 488-494, 2002

The Effects of Fall Application of Glyphosate on Corn (Zea mays), Soybeans (Glycine max), and Johnsongrass (Sorghum halepense). Weed Science 29(2): 190-195, 1981

Delayed burndown in no-tillage glyphosate-resistant corn (Zea mays) planted into soybean (Glycine max) residue and a wheat (Triticum aestivum) cover crop. Weed Technology 15(3): 467-473, 2001

Continuous tillage and rotation combinations effects on corn zea mays soybean glycine max and oat avena sativa yields. Agronomy Journal 77(3): 459-465, 1985

The effects of fall application of glyphosate on corn zea mays soybeans glycine max and johnson grass sorghum halepense. Weed Science 29(2): 190-195, 1981

Influence of herbicide application rate, timing, and interrow cultivation on weed control and corn (Zea mays) yield in glufosinate-resistant and glyphosate-resistant corn. Weed Technology 13(4): 807-813, 1999