Goulding Chemicals - Recommendations : : Cereals (Winter Oilseed)

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 40. Nutrient Requirements (unit/acre)
Index	N	P	K
1 Very Low	180	28	52
2 Low	144	24	28
3 Medium	128	16	20
4 High	112	0	0

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

Fertiliser Recommendation

Table 41. Application rate (bags/acre)
Index	K1 Very Low	K2 Low	K3 Medium	K4 High
P1 Very Low	2¾ x (10-10-20)	1½ x (0-10-20) + 3 x (Classic NP)	1 x (0-10-20) + 1 x (16% Superphos)	1¾ x (16% Superphos)
P2 Low	2 ¼ x (0-10-20)	1 ½ x (0-10-20) + 2 x (Classic NP)	1 x (0-10-20) + 3 x (Classic NP)	1½ x (16% Superphos)
P3 Medium	2 x (0-7-30)	1½ x (0-10-20)	1 x (0-10-20) + 1½ x (Classic NP)	1 x (16% Superphos)
P4 High	1 x (Muriate of Potash 50%)	2 x (Classic NK)	1 x (Classic NK)	0

	Autumn application of Nitrogen (N) is unlikely to be justified. If used do not exceed 30 units/acre
	In some cases the Phosphorus (P) and Potassium (K) can be split into an autumn and a spring application but this is not usually the case. For local knowledge consult your advisor.
	Nitrogen (N) should be applied in two splits. The first should be approx. 30% of total and applied in late February. The remainder should be applied in the first week of April.
	Boron (B): should be applied in low Boron soils. This can be obtained in C.A.N. + Boron and applied as a top dressing.
	Sulphur (S): on light sandy soils Oil Seed Rape responds very well to Sulphur up to 20/units/acre.
	Magnesium (Mg): if soil is low in Mg then it should be applied. Kieserite can be used. This product contains 20% Sulphur and 15% Magnesium.
	Sweetgrass: 23% Nitrogen (N) + 2% Sulphur (S) + 1.2% Magnesium (Mg) + 5% Sodium (Na). This is an excellent product for top dressing Oil Seed Rape due to the two-fold benefits of the Nitrogen combined with the Sulphur, Magnesium and Sodium.

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