Stomatal Closure Behavior Induced by Row Spacing and Evaporative Demand in Irrigated Peanuts1
- J. F. Stone,
- P. I. Erickson and
- A. S. Abdul-Jabbar2
Peculiar stomatal action has been suggested as one causal factor for observed differences in water use between peanuts (Arachis hypogaea L.) grown in narrow and wide rows. This study was designed to characterize stomatal action in narrow- and wide-row plantings on a Udic Argiustoll soil. Measurements of stomatal diffusive resistance (R,) and leaf-water potential Ψw were made daily at half hour intervals on irrigated peanuts grown in narrow-row (NR) and wide-row (VVR) spacings during periods of flowering to pod development in 1979,1981, and 1982. Measurement days were classified as low, moderate, and high evaporative demand days according to respective daily meteorological conditions. In both NR and WR treatments the relationship between Rs and Ψw was generally linear. On certain days, however, NR-R, increased to much higher values earlier in the afternoon at a given Ψw than WR-Rs. The effect was most pronounced on high evaporative demand days and was never noted on low evaporative demand days. Data for 3 years reveal the NR stomatal closure effect was real and repeatable.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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