Fecha de publicación: 27/02/2001 Fuente: Wipo "precision farming" An assembly10fed by a pressurised pipe2and comprising three differently rated spray nozzles11, 12, 13is mounted on a spray boom so that11, 12and13traverse the same area. The nozzles11, 12, 13are independently remotely pneumatically controlled to give an overall spray rate range of from 0.4 to 2.5 liter/min., useful in precision farming.