Soil testing at this point allows time to correct deficiencies that may be present. The optimum pH for brassica is in the range 5.8-6.2, which can take six months to correct with lime. An autumn spray-out of run-out pasture achieves control of clover and perennial weeds. Sowing of an annual or Italian ryegrass provides high yields of quality pasture during the winter break. Consider implementing this approach for next seasons cropping programme.
Ideally, brassicas should not be planted more than once in a five year rotation where clubroot or dry rot is a problem, even when using clubroot or dry rot tolerant varieties. Kale and Raphno should be the only brassicas considered for a second crop and should not be sown if clubroot has been observed in the previous crop.
If brassicas are sown following a crop, consideration should be given to the previous crop’s herbicides when making the brassica selection.