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The optimum depth of placement depends on the irrigation method and the frequency of irrigation, as well as the type of crop and soil. The table below is given as a guide, based on our experience. Placement depths are measured from the soil surface to the locking ring. If measuring to the rim of the funnel, subtract 10 cm from the depths in the table. With experience, these recommendations can be adjusted for local conditions.

Type of irrigation

Notes

Shallow Detector

Deep Detector

Drip

Amount applied per dripper usually less than 6 litres at one time (e.g. row crops, pulsing)

30 cm

45 cm

Drip

Amount applied per dripper usually more than 6 litres at one time (perennial crops)

30 cm

50 cm

Sprinkler

Irrigation is usually less than 20 mm at one time (e.g. centre pivot, micro-jets)

15 cm

30 cm

Sprinkler

Irrigation is usually more than 20 mm at one time (e.g. sprinklers and draglines)

20 cm

30 cm

Flood

Deeper placements than shown needed for infrequent irrigations or very long furrow

20 cm

40 cm

When the float is in the up position a wetting front has moved past the detector. The soil above the detector is as wet as it can be (almost saturated). That is why the above depths may appear to be shallow. A third detector, 10 cm below the deep detector depth shown above, can be installed if necessary.




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