Effect of drought stress on velvetleaf (Abutilon theophrasti) and bentazon efficacy
1994
Greenhouse experiments were conducted to determine the effects of drought stress length and relief on velvetleaf growth and bentazon efficacy with crop oil concentrate (COC) and 28% urea ammonium nitrate (UAN). Drought stress caused leaf water and osmotic potentials to decline linearly over time. Leaf water potential declined 0.02 and 0.08 MPa day-1 for velvetleaf subjected to -0.03 and -0.4 MPa soil water potential, respectively. Osmotic potential declined 0.02 and 0.21 MPa day-1 for velvetleaf subjected to -0.03 and -0.4 MPa, respectively. Bentazon did not reduce drought-stressed compared to nondrought-stressed velvetleaf dry weight 21 d after treatment with either COC or no adjuvant but did decrease dry weight with UAN. Reduced velvetleaf dry weights in drought-stressed velvetleaf compared to non-drought-stressed velvetleaf could not be accounted for by increased bentazon penetration in the drought-stressed plants. Rewatering velvetleaf subjected to 7 d of -0.4 MPA soil water potential caused them to be more sensitive to bentazon than velvetleaf subjected to -0.03 MPa soil water potential except when UAN was the adjuvant.
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