Abstract
Abstract Droplet spreading behaviour of water‐based Vision® (a commercial formulation of glyphosate) spray mixes was studied, using a size range from 55 to 1495 μm in diameter. The mixes were prepared to provide a dosage rate of 0.75 kg of glyphosate in 10, 20 and 30 L per ha with and without five different adjuvants, viz., Ethomeen® T/25 (catiohic), Triton® X‐45 (nonionic), Triton® DF‐20 (anionic), Triton® QS‐15 (amphoteric) and Silwet L‐77 (organosilicone) surfactants, on Kromekote® cards (K‐cards) and water‐sensitive paper strips (WSP‐strips). Spread factors (SF, the ratio of the stain diameter ‘D’ of a droplet on the K‐cards or WSP‐strips to the spherical diameter ‘d’ of the droplet making the stain) ranged from 1.5 to 4.7. The investigation on the role of volume rates on SF, hp (penetration depth) and hE (stain height), showed that the droplets of Vision with no added surfactant, and those containing Ethomeen and Silwet adjuvants underwent complete spreading at the 20 and 30 L/ha volume rates, but fo...
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