Spray application factors and plant growth regulator performance: II. Foliar uptake of gibberellic acid and 2,4-D

✍ Scribed by Knoche, Moritz; Bukovac, Martin J

• Publisher: John Wiley and Sons
• Year: 1999
• Tongue: English
• Weight: 231 KB
• Volume: 55
• Category: Article
• ISSN: 1526-498X
• DOI: 10.1002/(sici)1096-9063(199902)55:2<166::aid-ps886>3.0.co;2-2

✦ Synopsis

Eþ ects of droplet size and carrier volume on foliar uptake and translocation of gibberellic acid and 2,4-D were investigated. Simulated spray droplets were applied to primary leaves of (GA 3 ) 10-day-old Phaseolus vulgaris (cv Nerina) in droplet sizes and carrier volumes ranging from 0.5 to 10 ll and 10 to 200 ll per leaf, respectively. Doses of (2 lg per leaf) and 2,4-D (100 lg per leaf) were GA 3 held constant. Total uptake of approached a penetration equilibrium within 24 h after applica-GA 3 tion, but uptake of 2,4-D continued to increase. Decreasing droplet size and/or increasing carrier volume increased and 2,4-D uptake. GA 3 Translocation to stem and roots was positively related to total uptake. A positive linear relationship between the logarithm of the total droplet/leaf surface interface area and 2,4-D uptake or translocation was found, but for this relationship was quadratic. Potential mechanisms of the eþ ects GA 3 of spray application factors on foliar uptake are discussed.