Clubroot problem is mainly showing up in the low pH soil of Alberta. Liming has been used as a control measure since the early 19th century. There is a close relationship between soil pH and Clubroot with acidic soils generally favoring Clubroot development.
SuperCal 98G pelletized lime a product which is 98% pure calcitic limestone, breakdowns rapidly and completely, thus raising pH in the first year has a good ft. According to the “Agriculture and Agri-Food Canada bulletin on Clubroot of Crucifers”, the scientific jury is still out on whether liming aids in disease control by raising pH or by increasing the calcium concentration.
We know that calcium is necessary for proper functioning of growing points particularly root tips. Also it forms compounds which strengthen cell walls and aids in cell division and elongation. Clubroot affects these processes in the plant.
Thus more research is needed to understand the effects of liming on Clubroot control and to establish additional recommendation. What is the effect of calcium placed in seed row or close to the seed building up local concentration as calcium is not easily translocated in plants, so a constant supply is required?
From Terry Waddell, Agronomist with McRae Holdings