@article{
 title = {Yield Ranks of Glyphosate-Resistant Cotton Cultivars are Unaffected by Herbicide Systems},
 type = {article},
 year = {2002},
 pages = {889-894},
 volume = {94},
 websites = {http://agron.scijournals.org/cgi/content/abstract/agrojnl;94/4/889},
 id = {670e992e-83ee-3ade-b361-f95d9d6c9b35},
 created = {2012-01-05T13:07:25.000Z},
 file_attached = {false},
 profile_id = {1a467167-0a41-3583-a6a3-034c31031332},
 group_id = {0e532975-1a47-38a4-ace8-4fe5968bcd72},
 last_modified = {2012-01-05T13:14:35.000Z},
 tags = {United States,economic,herbicide tolerant cotton,productivity},
 read = {false},
 starred = {false},
 authored = {false},
 confirmed = {true},
 hidden = {false},
 source_type = {Journal Article},
 abstract = {Official Cultivar Trials (OCTs) evaluate transgenic, glyphosate [N-(phosphonomethyl)-glycine]-resistant and nonresistant cotton (Gossypium hirsutum L.) cultivars with a nonglyphosate herbicide regime. Thus, yields of glyphosate-resistant cotton cultivars in OCTs may not reflect cultivar variation in glyphosate resistance or the intended production system because all cultivars are produced under a common herbicide regime. Our objective was to assess in field trials main effects and interaction among glyphosate-resistant cotton cultivars and herbicide systems with and without glyphosate for lint yield. Fourteen glyphosate-resistant cultivars were tested in 1998 while 10 were tested in 1999. Herbicide systems were (i) Standard, preplant soil-applied and postdirect-applied herbicides potentially used in OCTs but no glyphosate; (ii) Residual + Glyphosate, preplant soil-applied and postdirect-applied herbicides including a four-leaf-stage topical glyphosate application; and (iii) Glyphosate Only, a four-leaf-stage topical glyphosate application followed by an eight-leaf directed spray. We found significant (P < 0.05 and P < 0.10, earlier- and later-maturity trials, respectively) herbicide system main effects for lint yield but nonsignificant cultivar x herbicide system interactions. Averaged over years and cultivars, the Glyphosate Only herbicide system produced significantly (P < 0.05) greater yields (597 and 839 kg ha-1 for earlier- and later-maturity trials, respectively) than the Standard herbicide system (419 and 644 kg ha-1 for earlier- and later-maturity trials, respectively). The lack of cultivar x herbicide system interactions for yield suggests OCTs determine relative yield potential among glyphosate-resistant cultivars. The lower yield in the Standard system suggests OCTs can impose a yield penalty on glyphosate-resistant cultivars; thus, comparisons with non-glyphosate-resistant cultivars may not be valid.},
 bibtype = {article},
 author = {May, O Lloyd and Murdock, Edward C},
 journal = {Agron J},
 number = {4}
}

{"_id":"RGwZpPnZ6yHCeAmby","bibbaseid":"may-murdock-yieldranksofglyphosateresistantcottoncultivarsareunaffectedbyherbicidesystems-2002","downloads":0,"creationDate":"2015-08-05T17:19:25.641Z","title":"Yield Ranks of Glyphosate-Resistant Cotton Cultivars are Unaffected by Herbicide Systems","author_short":["May, O., L.","Murdock, E., C."],"year":2002,"bibtype":"article","biburl":null,"bibdata":{"title":"Yield Ranks of Glyphosate-Resistant Cotton Cultivars are Unaffected by Herbicide Systems","type":"article","year":"2002","pages":"889-894","volume":"94","websites":"http://agron.scijournals.org/cgi/content/abstract/agrojnl;94/4/889","id":"670e992e-83ee-3ade-b361-f95d9d6c9b35","created":"2012-01-05T13:07:25.000Z","file_attached":false,"profile_id":"1a467167-0a41-3583-a6a3-034c31031332","group_id":"0e532975-1a47-38a4-ace8-4fe5968bcd72","last_modified":"2012-01-05T13:14:35.000Z","tags":"United States,economic,herbicide tolerant cotton,productivity","read":false,"starred":false,"authored":false,"confirmed":"true","hidden":false,"source_type":"Journal Article","abstract":"Official Cultivar Trials (OCTs) evaluate transgenic, glyphosate [N-(phosphonomethyl)-glycine]-resistant and nonresistant cotton (Gossypium hirsutum L.) cultivars with a nonglyphosate herbicide regime. Thus, yields of glyphosate-resistant cotton cultivars in OCTs may not reflect cultivar variation in glyphosate resistance or the intended production system because all cultivars are produced under a common herbicide regime. Our objective was to assess in field trials main effects and interaction among glyphosate-resistant cotton cultivars and herbicide systems with and without glyphosate for lint yield. Fourteen glyphosate-resistant cultivars were tested in 1998 while 10 were tested in 1999. Herbicide systems were (i) Standard, preplant soil-applied and postdirect-applied herbicides potentially used in OCTs but no glyphosate; (ii) Residual + Glyphosate, preplant soil-applied and postdirect-applied herbicides including a four-leaf-stage topical glyphosate application; and (iii) Glyphosate Only, a four-leaf-stage topical glyphosate application followed by an eight-leaf directed spray. We found significant (P < 0.05 and P < 0.10, earlier- and later-maturity trials, respectively) herbicide system main effects for lint yield but nonsignificant cultivar x herbicide system interactions. Averaged over years and cultivars, the Glyphosate Only herbicide system produced significantly (P < 0.05) greater yields (597 and 839 kg ha-1 for earlier- and later-maturity trials, respectively) than the Standard herbicide system (419 and 644 kg ha-1 for earlier- and later-maturity trials, respectively). The lack of cultivar x herbicide system interactions for yield suggests OCTs determine relative yield potential among glyphosate-resistant cultivars. The lower yield in the Standard system suggests OCTs can impose a yield penalty on glyphosate-resistant cultivars; thus, comparisons with non-glyphosate-resistant cultivars may not be valid.","bibtype":"article","author":"May, O Lloyd and Murdock, Edward C","journal":"Agron J","number":"4","bibtex":"@article{\n title = {Yield Ranks of Glyphosate-Resistant Cotton Cultivars are Unaffected by Herbicide Systems},\n type = {article},\n year = {2002},\n pages = {889-894},\n volume = {94},\n websites = {http://agron.scijournals.org/cgi/content/abstract/agrojnl;94/4/889},\n id = {670e992e-83ee-3ade-b361-f95d9d6c9b35},\n created = {2012-01-05T13:07:25.000Z},\n file_attached = {false},\n profile_id = {1a467167-0a41-3583-a6a3-034c31031332},\n group_id = {0e532975-1a47-38a4-ace8-4fe5968bcd72},\n last_modified = {2012-01-05T13:14:35.000Z},\n tags = {United States,economic,herbicide tolerant cotton,productivity},\n read = {false},\n starred = {false},\n authored = {false},\n confirmed = {true},\n hidden = {false},\n source_type = {Journal Article},\n abstract = {Official Cultivar Trials (OCTs) evaluate transgenic, glyphosate [N-(phosphonomethyl)-glycine]-resistant and nonresistant cotton (Gossypium hirsutum L.) cultivars with a nonglyphosate herbicide regime. Thus, yields of glyphosate-resistant cotton cultivars in OCTs may not reflect cultivar variation in glyphosate resistance or the intended production system because all cultivars are produced under a common herbicide regime. Our objective was to assess in field trials main effects and interaction among glyphosate-resistant cotton cultivars and herbicide systems with and without glyphosate for lint yield. Fourteen glyphosate-resistant cultivars were tested in 1998 while 10 were tested in 1999. Herbicide systems were (i) Standard, preplant soil-applied and postdirect-applied herbicides potentially used in OCTs but no glyphosate; (ii) Residual + Glyphosate, preplant soil-applied and postdirect-applied herbicides including a four-leaf-stage topical glyphosate application; and (iii) Glyphosate Only, a four-leaf-stage topical glyphosate application followed by an eight-leaf directed spray. We found significant (P < 0.05 and P < 0.10, earlier- and later-maturity trials, respectively) herbicide system main effects for lint yield but nonsignificant cultivar x herbicide system interactions. Averaged over years and cultivars, the Glyphosate Only herbicide system produced significantly (P < 0.05) greater yields (597 and 839 kg ha-1 for earlier- and later-maturity trials, respectively) than the Standard herbicide system (419 and 644 kg ha-1 for earlier- and later-maturity trials, respectively). The lack of cultivar x herbicide system interactions for yield suggests OCTs determine relative yield potential among glyphosate-resistant cultivars. The lower yield in the Standard system suggests OCTs can impose a yield penalty on glyphosate-resistant cultivars; thus, comparisons with non-glyphosate-resistant cultivars may not be valid.},\n bibtype = {article},\n author = {May, O Lloyd and Murdock, Edward C},\n journal = {Agron J},\n number = {4}\n}","author_short":["May, O., L.","Murdock, E., C."],"bibbaseid":"may-murdock-yieldranksofglyphosateresistantcottoncultivarsareunaffectedbyherbicidesystems-2002","role":"author","urls":{},"downloads":0,"html":""},"search_terms":["yield","ranks","glyphosate","resistant","cotton","cultivars","unaffected","herbicide","systems","may","murdock"],"keywords":[],"authorIDs":[]}