Liming soil crop rotation

Do everything you can to prevent disease, as it can spread rapidly. Virus diseases are very difficult to control and affected plants should be removed and composted as soon as you notice them. The risk of infection by some fungal diseases can be reduced by raising the pH of the soil with lime (seep.55). Crop rotation (see pp.230-233) also plays an important role in reducing the severity of other soilborne diseases and some pests. 

The crop fits well into a cereal rotation on land that is clean and fertile. The earliest crops are cleared by the end of September and so it is possible to follow with winter wheat. Where club root is a problem, particularly on acid soils, brassicas should be grown no more than one year in four or five with a plaimed liming poUcy before planting. It is possible to grow brassicas continuously on a high pH soil. 

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