Petiole analysis for fertiliser management of potatoes on sands

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Crop stage

It is important to define the growth stage of the crop by measuring the size of the largest tuber and by recording the days from planting and emergence.

The S2 growth stage is commonly used as a point of reference in potato crop agronomy and is when the length of the longest tuber is 10mm. Collect the first petiole sample at the S2 stage and repeat the sampling every two to three weeks later, noting crop stage, as necessary for up to four samples.

Handling samples

Petiole samples should be submitted to an accredited plant testing service for analysis as soon as possible after collection. Samples should be kept as cool as possible and not left in the sun or in a vehicle.

If there is a delay between time of collecting and submitting of samples, keep them in a cool room at 4ºC in the meantime.

Contact information

Peter Dawson
+61 (0)8 9892 8461

Petiole analysis for fertiliser management of potatoes on sands

Author

Ian McPharlin