| 摘要 |
An assembly 10 fed by a pressurised pipe 2 and comprising three differently rated spray nozzles 11, 12, 13 is mounted on a spray boom so that 11, 12 and 13 traverse the same area. The nozzles 11, 12, 13 are independently remotely pneumatically controlled to give an overall spray rate range of from 0.4 to 2.5 liter/min., useful in precision farming.
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