Cover Crop
Benefits
Crop
Yields Soil
Quality Beneficial
Insects Diseases
and Nematodes Weeds Nutrient
Availability Soil
Compaction Soil
Moisture Erosion Runoff Organic
Matter Infiltration
Cover Crops Effects on Nematodes and Diseases
Several Columbia Basin farmers (hyperlink this to case studies) are using cover crops to help manage parasitic nematodes and soil-born diseases. Research has shown that specific varieties of sudangrass (or sorghum-sudangrass hybrids), and some Brassicas, including rapeseed and mustard, can reduce populations of Columbia root-knot nematode. Using these cover crops, farmers have also reduced the populations of other types of nematodes and some soil-born diseases, including Verticillium dahliae. The nematodes and plant diseases are killed by chemicals produced when these cover crops decay in the soil. In the case of mustard, the chemicals produced are very similar to the chemicals in the fumigant VAPAM.
See Using Green Manures in Potato Cropping Systems for more information.
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