The NDWC Crop Review and Outlook Session precedes the International Durum Forum of the U.S. Durum Growers Association, which runs from noon on Nov. 10 until 1 pm, Nov. 11. Knowing how much N is in the soil before fertilizer applications occur is always essential for efficient crop production, year in and year out, says Franzen. Usually, turnaround of samples takes only a few days, providing producers or crop consultants with time to receive the results prior to application. Soil sampling for N is especially useful following small grains and grassy crops. Soil N sampling is also useful following annual legumes, such as soybeans, dry beans and field peas.
Soil testing is also important following potatoes, canola, sunflowers and other broadleaf crops.
But soil sampling may not provide a good indication of N contribution following sugar beets since much of the N in the soil is tied up in the plant tops until they rot the next spring. Franzen says most growers hire their soil sampling done by a professional. However, with the right tools and the time, growers can sample their own fields. Ag engineer Randy Raper developed the tool, called a multiple-probe soil cone penetrometer. It tests soils for compaction and for layering that restricts root growth, information that helps with tillage decisions.