Effect of surfactant concentration and spray volume on retention of organosilicone sprays on wheat

Abstract

The retention of organosilicone surfactant sprays (0-0.8% v/v) on wheat was determined, using a calibrated track sprayer, over a range of spray volumes representative of ground-based arable applications (37-280 litres/ha). Volume of spray retained on foliage generally increased with carrier volume and surfactant concentration. Spray run-off was not evident with any treatment. The importance of the interaction between concentration of organosilicone and spray volume was highlighted. Spray was captured most efficiently at low spray volumes and • 0.2% surfactant. It is expected that organosilicone surfactant addition to pesticide sprays on difficult-to-wet arable species would be beneficial over a wide range of application volumes.

Suspension Concentrate crop protection formulation design and performance for low spray volume and UAS spray application

“…42 In a study on wheat, the effect of organosilicone surfactants on spray retention at spray volumes of 37, 56, 127 and 280 L/ha was examined and the spray capture efficiency on the crop was found to be greater at lower spray volumes and with higher surfactant concentrations. 43 This highlighted the importance of the interaction of the organosilicone surfactant concentration with the spray volume. In another study, van Zyl et al investigated the effects of adjuvants on grapevine foliage deposition efficiency for a commercial fenhexamid SC formulation.…”

“…Furthermore, it was noted that 50% spray volumes were still too high and spray volumes <200 L/ha were recommended 42 . In a study on wheat, the effect of organosilicone surfactants on spray retention at spray volumes of 37, 56, 127 and 280 L/ha was examined and the spray capture efficiency on the crop was found to be greater at lower spray volumes and with higher surfactant concentrations 43 . This highlighted the importance of the interaction of the organosilicone surfactant concentration with the spray volume.…”

Biological, surface, and wetting behavior of bio‐surfactants tank‐mixed with trifloxysulfuron‐sodium on Sorghum halepense

“…× E. grandis L.), 28 (iv) herbicide formulation as evaluated on Benghal dayflower ( Commelina benghalensis L.) and hairy fleabane ( Conyza bonariensis (L.) Cronquist), 29 (v) non‐ionic surfactant concentration as evaluated on the leaves of cotton ( Gossypium hirsutum L.), 30 (vi) adjuvant type as evaluated on the leaves of soybean ( Glycine max (L.) Merr. ), 31 and (vii) air temperature as evaluated on the leaves of barley ( Hordeum vulgare L.) 32 …”

“…), 31 and (vii) air temperature as evaluated on the leaves of barley (Hordeum vulgare L.). 32 There is a positive correlation between spray retention on grassy species and dynamic surface tension which is a function of the synthetic surfactant concentration. 33 As a result, the expectation is that the greater the surfactant concentration, the greater the herbicide efficacy.…”