Maize

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
1 144 56 200
2 112 40 180
3 88 32 152
4 60 0 96*

*No fertiliser K is required where soil K is above 250mg/l

Fertiliser Recommendation

Table 45. Application rate (bags/acre)
Index K1 K2 K3 K4
P1 1 x Maize Starter
+
6 x 18-6-12
+
2½ x Muriate of Potash
1 x Maize Starter
+
6 x 18-6-12
+
2 x Muriate of Potash
1 x Maize Starter
+
6 x 18-6-12
+
1½ x Muriate of Potash
1 x Maize Starter
+
6 x 18-6-12
+
½ x Muriate of Potash
P2 1 x Maize Starter
+
8 x 15-3-18
+
1 x Muriate of Potash
1 x Maize Starter
+
8 x 15-3-18
+
½ x Muriate of Potash
1 x Maize Starter
+
8 x 15-3-18
1 x Maize Starter
+
5 x 15-3-18
+
2 x Classic NP
P3 1 x Maize Starter
+
5 x 15-3-18
+
2 x Classic NK
+
1½ x Muriate of Potash
1 x Maize Starter
+
5 x 15-3-18
+
2 x Classic NK
+
1 x Muriate of Potash
1 x Maize Starter
+
5 x 15-3-18
+
2 x Classic NK
+
½ x Muriate of Potash
1 x Maize Starter
+
5 x 15-3-18
+
1 x Urea
P4 2 Classic NK
+
3 x Muriate of Potash
+
3½ x CAN
2 Classic NK
+
3 x Muriate of Potash
+
3½ x CAN
2 Classic NK
+
2 x Muriate of Potash
+
3½ x CAN
2 Classic NK
+
1 x Muriate of Potash
+
3½ x CAN

*Assuming N Index 1. I.e. field is in continuous cereals for previous 5 years
**These are fertiliser requirements where slurry is not applied. Where 3000 gallons of cattle slurry is applied and incorporated per acre, reduce requirement of N by 18units, P requirement by 15 units and K requirement by 114units.

Application of 3,000 gallons/acre of cattle slurry is beneficial. It is not recommended to top dress with Nitrogen after the crop has emerged as it damages the growing point.