Swedes/Turnips

The recommendations in this section are using the RoI fertiliser classification system and are based on Teagasc research.

Due to slight differences between the RoI and NI classification systems, these recommendations are only a guide for Northern Ireland farmers. They can be converted between the RoI and NI classification systems using this Conversion Table.

Before choosing your fertiliser products please consult your local advisor to ensure that you do not exceed the limits for your farm as determined by the nitrates directive (SI no 31 of 2014)

Table 44. Nutrient Requirements (units/acre)
Index N P K
1 Very Low 72 56 96
2 Low 56 48 80
3 Medium 32 32 48
4 High 16 32 48

Fertiliser Recommendation

Table 45. Application Rate (bags/acre)
Index K1 Very Low K2 Low K3 Medium K4 High
P1 Very Low 5½ x (6-10-18+B )
+
1½ x SWEETGRASS
4 x (6-10-18+B)
+
1 x (16% Superphos)
+
1½ x SWEETGRASS
3 x (6-10-18+B)
+
1½ x (16% Superphos)
+
2 x SWEETGRASS
3 x (6-10-18+B)
+
1½ x (16% Superphos)
+
2 x SWEETGRASS
P2 Low 4¾ x (6-10-18+B)
+
1½ x SWEETGRASS
4¾ x (6-10-18+B)
+
1½ x SWEETGRASS
3 x (6-10-18+B)
+
1 x (16% Superphos)
+
2 x SWEETGRASS
3 x (6-10-18+B)
+
1 x (16% Superphos)
+
2 x SWEETGRASS
P3 Medium 3 x (8-5-18+B)
+
1½ x (0-10-20)
+
1½ x SWEETGRASS
3 x (8-5-18+B)
+
1½ x (0-10-20)
+
1½ x SWEETGRASS
3 x (6-10-18+B)
+
2 x SWEETGRASS
3 x (6-10-18+B)
+
2 x SWEETGRASS
P4 High 2 x (8-5-18+B)
+
3 x (0-7-30)
+
2 x SWEETGRASS
2 x (8-5-18+B)
+
2 x (0-10-20)
+
2 x SWEETGRASS
2½ x (6-10-18+B)
+
2 x SWEETGRASS
2½ x (6-10-18+B)
+
2 x SWEETGRASS

*Assuming N index 1

  • Boron should be applied to Swedes and Turnips as a routine measure on low Boron soils, high pH soils, and light sandy soils. Consult your local advisor for the amount of Boron to apply

Top Dressing

  • Sweetgrass: 23% Nitrogen (N) + 2% Sulphur (S) + 1.2% Magnesium (Mg) + 5% Sodium (Na). This should be used for top dressing the beet as an alternative to ordinary Nitrogen. The two-fold benefit of the combination of Nitrogen along with the Sulphur, Magnesium and Sodium make it a perfect option for swedes and turnips.