7 Soil Sampling

Nematodes

    Nematode sampling is an important part of monitoring small grain. Although many people take nematode and soil samples at the same time, better results will come from samples taken at different times. Nematode samples should be taken while the crop is still in the field and nematode populations are at a peak. Once the crop is harvested, nematode populations are greatly decreased, and samples are less likely to reflect damaging levels. To take samples for nematode testing, use a soil sampling tube. Insert the tube at a slight angle under the plant so that it cuts through the root zone and collects roots as well as soil. Take 10 samples per 5 acres. For correct identification, nematodes must arrive at the nematode lab alive. Protect nematode samples from extreme temperatures and hold them for no longer than two days. Store samples in a cool storage room or in a refrigerator until ready for shipment.
 

Fertility

    The best fertility samples are obtained after the crop has been harvested and, preferably, after the field has been lightly disked. Take 10 samples per 5 acres. Using a soil probe, take samples 8 to 10 inches deep. After all samples are taken, mix the soil thoroughly before taking a sample for shipment to the soil analysis lab.