QuestionsHow to growVegetable GrowingWinter swedesturnips 0 Vote Up Vote Down liz durkan asked 14 years ago My turnips are brown in centre look perfect on outside .what causes this and how can I treat for next year .This is second year it has happened all other root veg perfect. 1 Answers 0 Vote Up Vote Down Gerry Daly Staff answered 7 years ago This sounds like boron deficiency, which is more common in a dry year. Try applying 3 grams of borax, half teaspoon, per square metre in spring before sowing, or use a boronated fertilizer from a farm merchants.