Spring Barley

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 34. Nutrient Requirements (unit/acre)
Index N P K
1 108 36 92
2 80 28 80
3 60 20 68
4 32 0 0

The nitrogen recommendations in the above Table are for light shallow soils.

  • Where straw is not removed, decrease Phosphorus (P) rates by 4 units and Potassium (K) by 50 units.
  • These recommendations are based on the maximum nitrogen and phosphate levels permitted.
  • Where proof of higher yields is available, an additional 20kg N/ha may be applied for each additional tonne above the following yields; Spring Barley – 6.5 tonnes/ha.
    • Spring Barley – 7.5 tonnes/ha.
    • The higher yields shall be based on the best yield achieved in any of the three previous harvests, at 20% moisture content.
  • Where proof of higher yields is available, an additional 3.8kg P/ha may be applied on soils at phosphorus indices 1, 2, or 3 for each additional tonne above a yield of 6.5 tonnes/ha. The higher yields shall be based on the best yield achieved in any of the three previous harvests, at 20% moisture content.

Fertiliser Recommendation

Table 35. Application rate (bags/acre)
K1 K2 K3 K4
P1 3 x (0-10-20)
+
2 x (Classic NK)
+
2½ x CAN
3½ X (0-10-20)
+
1½ x (Classic NK)
+
3 X CAN
3½ X (0-10-20)
+
4 X CAN
1¾ X (16% Superphosphate)
+
2 x (Classic NP)2 x CAN
P2 3 X (0-7-30)
+
1½ x (Classic NP)
+
2½ X CAN
2½ X (0-10-20)
+
2 X (CLASSIC NK)
+
2½ x CAN
2½ X (0-10-20)
+
1 X (CLASSIC NK)
+
3¼ X CAN
1½ X (16% Superphosphate)
+
1 X (Classic NP)
+
3 X CAN
P3 2½ X (0-7-30)
+
1 x (Classic NK)
+
3¼ X CAN
2½ X (0-7-30)
+
1 X (Richland)
+
3 x CAN
2 X (10-10-20)
+
2 X (CLASSIC NK)
+
2 x CAN
¾ X (16% Superphosphate)
+
2 x (Classic NP)
+
2 x CAN
P4 1½ X (Muriate of Potash)
+
1 x (Classic NK)
+
3¼ X CAN
1½ X (Muriate of Potash)
+
4 X CAN
1 X (Muriate of Potash)
+
1 X (CLASSIC NK)
+
3¼ X CAN
4 X CAN
No P or K required

Top Dressing:

  • Nitrogen (N) C.A.N. Sulpha C.A.N, Urea or Sweetgrass can be used to satisfy the extra Nitrogen requirements of the crop.
  • Early sown crops: In these cases ½ of a 50kg bag/acre of 10-10-20 can be withheld from the seedbed. The Phosphorus (P) and Potassium (K) requirement can be fulfilled by applying 2 x 50kg bags/acre of Richland as a top dressing. There are clear advantages in applying some P and K as a top dressing when the plant is tillering and the roots are established enough to take in the nutrients.
  • Richland: 22.7 – 2.5 – 5 + 3% Sulphur (S) + Copper (Cu), Manganese (Mn), Magnesium (Mg) and Zinc (Zn). The unique blend of N, P, K with Sulphur and vital trace elements make it an excellent option for top dressing spring cereals.
  • Sulphur (S) should be used on crops up to the Teagasc recommended level of 12 units/S/acre.