Goulding Chemicals - Recommendations : : Root Crops

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 378) of 2006.

Table 48. Nutrient Requirements (units/acre)
Index	N	P	K
1 Very Low	124	100	196
2 Low	104	92	148
3 Medium	84	80	96
4 High	64	68	52

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Fertiliser Recommendation

Table 49. Application Rate (bags/acre)
Index	K1 Very Low	K2 Low	K3 Medium	K4 High
P1 Very Low	12 x (7-6-17) + 1¾ x (16% Superphos)	9 x (7-6-17) + 2¾ x (16% Superphos)	6 x (7-6-17) + 4 x (16% Superphos)	3 x (7-6-17) + 5 x (16% Superphos)
P2 Low	12 x (7-6-17) + 1x (16% Superphos)	9 x (7-6-17) + 2 x (16% Superphos)	6 x (7-6-17) + 3¾ x (16% Superphos)	3 x (7-6-17) + 4½ x (16% Superphos)
P3 Medium	12 x (7-6-17) + ½ x (16% Superphos)	10 x (7-6-17) + 1 x (16% Superphos)	6 x (7-6-17) + 2¾ x (16% Superphos)	3½ x (7-6-17) + 3½ x (16% Superphos)
P4 High	9 x (7-6-17) + 1 x (Sulphate of Potash 42%)	9 x (7-6-17)	6 x (7-6-17) + 2 x (16% Superphos )	3 x (7-6-17) + 3 x (16% Superphos)

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7:6:17+8% Sulphur (S)

containing Sulphate of Potash can give drier potatoes than 10:10:20 containing Potassium Chloride. High Nitrogen (N) rates will increase tuber size, reduce dry matter content and delay maturity.

A farmer is in a low fertility area (P1,K1). The fertiliser regime will be 12 bags of 7:6:17 + 1¾ bags of 16% Superphos.

A farmer is in a medium fertility area (P2,K2). The fertiliser regime will be 9 bags of 7:6:17 and 2 bags 16% Superphos.

A farmer is in a good fertility area (P3,K3). The fertiliser regime will be 6 bags of 7:6:17 and 2 bags of 16% Superphos.

For all situations, apply C.A.N. or Urea to satisfy the Nitrogen requirements as recommended by your advisor.

Goulding Chemicals Limited, Centre Park Road, Marina, Cork, Ireland
Tel: +353 (0)21 4911 611 | Fax: +353 (0)21 4911 660 | Email: sales@gouldings.ie