#Plant2020 has arrived.

Since I completed my LAST course EVERRRR (and it was soil biogeochem), let's discuss #clubroot + #soil:

Soil moisture & the physical condition of the soil significantly influences the severity of clubroot (Karling, 1968).

From bioassays (ie plant samples), Wallenhammar (1996) found that clubroot infestation was greatest in clay (60%)> silt(~50%) > coarse sand (~30%) soils.

Additionally, soils with low humus content (<6%) had the highest avg infestation (~70%).

* research completed in Sweden

70% moisture content of max WHC of the soil is enough for infection (Colhoun,1953). Loams have a greater WHC than clay-free soil, so disease severity was higher (58% vs 28%).

5x as many spores per cm3 of soil were needed for infection in humus-rich vs clay soils (Naumov, 1928).

With a foreseeable wet spring in central/northern AB, be mindful of clubroot.

Just because you haven't pulled a plant w visible clubroot galls DOES NOT mean you don't have it.

Knocking off 90% of soil (big clumps) from equipment is 90% less soil movement on roads & btwn fields.