Effect of straw, ash, and tillage on dissipation of imazaquin and imazethapyr

• Published in: Weed science Vol. 41; no. 1
• Main Authors: Monks, C.D, Bank, P.A
• Format: Journal Article
• Language: English
• Published: 01.01.1993
• Subjects: BRULAGE; CENDRE; CENIZA; CERO-LABRANZA; DOSE D'APPLICATION; DOSIS DE APLICACION; GEORGIA (EUA); GEORGIE (EU); GLYCINE MAX; GOSSYPIUM HIRSUTUM; HERBICIDAS; HERBICIDE; LABRANZA; NON TRAVAIL DU SOL; PAILLE; PAJA; PERDIDAS DE LA COSECHA; PERTE DE RECOLTE; QUEMA; ROTACION DE CULTIVOS; ROTATION CULTURALE; TIPOS TEXTURALES DE SUELOS; TRAVAIL DU SOL; TYPE DE SOL TEXTURAL
• ISSN: 0043-1745; 1550-2759
• DOI: 10.1017/S0043174500057702

Experiments were conducted on a Cedarbluff silt loam and a Cecil sandy loam to determine dissipation of imazaquin and imazethapyr as influenced by burning small-grain straw and tillage prior to soybean planting. Corn bioassay detection limits for imazaquin and imazethapyr in the Cedarbluff silt loam were 2.5 to 30 and 5 to 40 ppbw, respectively. Bioassay detection limits for imazaquin and imazethapyr in the Cecil sandy loam were 2.5 to 20 and 10 to 40 ppbw, respectively. Imazaquin and imazethapyr activity was not detectable in soil by 110 to 152 d after treatment. Imazethapyr dissipation was not affected by burning or tillage in the Cedarbluff silt loam and dissipated more slowly in 1989 than imazaquin. Imazaquin dissipation in the Cedarbluff silt loam in 1988 was slower in burned plots than in nonburned plots but was not affected by burning in 1989. No differences were observed between imazaquin and imazethapyr dissipation in the Cecil sandy loam and neither burning or tillage influenced their rate of dissipation in either year. No-till-planted cotton was injured at both locations by imazaquin and imazethapyr that had been applied the previous year