| 摘要 |
PURPOSE:To regulate sensitivity to an insensitive side when a sensor mistakes a clogged state simultaneously with starting of fertilizer application work, since a large amount of a fertilizer is dissolved in a muddy water, by enabling change and regulation of a detected fertilizer concentration standard of a fertilizer concentration sensor by a single regulating setter. CONSTITUTION:A fertilizer in a fertilizer tank 10 is delivered by rotation and operation of a fertilizer delivering device 11 simultaneously with rice transplanting work, fed through a conveying pipe 14 and released to furrows created by a furrower. In the case of a clogged state without discharging the fertilizer to the back, the dissolved fertilizer concentration in muddy water in this part is increased to light an alarm lamp and an alarm buzzer starts sounding. If the sensor mistakes a large amount of the fertilizer dissolved in muddy water for the clogged state simultaneously with start of fertilizer application work, sensitivity is regulated to an insensitive side so as not to light the alarm lamp or sound the alarm buzzer by a detection regulating setter 25.
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