A New Technology for Improved Pesticide Coverage on the Cotton Canopy. Part I: Sprayer Development
Mar 5, 2019
Insect control in cotton fields should comply with the new demands for reduction of pesticide toxicity and environmental hazard. In order to meet these demands, a new technology capable of delivering very high spray deposition uniformity was developed and tested. Penetration of the spray into the dense cotton canopy was achieved utilizing fast air streams, while efficient deposition was achieved by a slow and turbulent airflow close to the canopy parts. Sharp decline in the air velocity was achieved by narrow air curtains, generated from outlets in the form of long and narrow slits. Based on the experience that the upper sides of the leaves are much better spray collectors than the underside, air deflectors at the air outlets were designed to create upward velocity components and to enhance spray deposition on the undersides. Field tests showed that the new sprayer delivers far better uniformity of spray deposition in cotton fields than do conventional sprayers.