Influencing Oilseed Rape Health

Oilseed Rape HealthA healthy crop is the key to high yields and high quality of the end product. Any nutrient deficiency will reduce the ability of the oilseed rape to grow according its genetic potential. A large number of deficiency symptoms will appear in the crop as a consequence of a lack in the availability of nutrients. A crop which is not in a healthy condition will have poorer defense mechanisms and less tolerance against fungi, insects and abiotic stress, affecting the overall crop growth and quality. Oilseed rape shares many of the same diseases and pests with other members of the Brassica family.

Sulphur influences, not only in the quantity of proteins, but also the quality through the synthesis of sulphur containing amino acids (cysteine and methionine), these amino acids are also the precursors of co-enzymes and glucosinolates. The latter are essential since they contribute to the oilseed rape’s resistance to disease and parasites although too high a content renders the oilcakes unsuitable for consumption by monogastric animals. The current “00” varieties have glucosinolate contents between 8 and 15 μmoles/g of seed.

Pathogens represent a threat to the crop, but the pressure from these organisms can be reduced by not too narrow crop rotation. The rate of infestations decreases considerably with rotations from 3 (17%) to 6 (33%) years as shown in this table.


Clubroot is an increasing problem in oilseed rape and close rotations has exacerbated this problem. Plants can wilt in hot, dry weather, be very stunted and might die out completely.

Oilseed Rape ClubrootClubroot is caused by a soil-borne fungus and affects all brassica species. It infects root tissues, stimulating abnormal growth of affected parts. This clubbed tissue significantly restricts growth and can also release spores which can be transferred to other fields.

Within the soil, these spores can last over ten years, infecting any subsequent brassica crop in the rotation. While some fungicides are available, these are limited in activity and not available in many countries. Resistant varieties are also limited in their availability to resist all clubroot variants.

Liming to maintain a pH above 7.2 as part of an integrated control program which utilizes calcium-based fertilizers will help to suppress the pathogen.

Good rotations (every 7 years) between Brassica crops (Oilseed rape and Vegetable Brassicas); practices that minimize the spread of infected soil; better drainage and control of all brassica family weeds are all recommended methods of minimizing clubroot.


Sclerotina stem rot, also called Stalk break or White mould, can be one of the most destructive diseases in oilseed rape. The severity of the attacks vary from year to year depending on the weather, but it also varies from region to region or even from field to field. As the scale of production of oilseed rape has increased, Sclerotinia has become a more serious problem. The reason can be more narrow rotations, and/or denser canopies. Humid weather makes Sclerotinia thrive in the crop.

The infections of Sclerotinia occur when the oilseed rape plants are in bloom. The fungus is soil born and has a large range of hosts that includes more than 75 broad-leaf plant families. The result of Sclerotinia infections are premature ripening and crop lodging, leading to general loss in production.

Excess Nitrogen fertilization will produce a lush, humid plant canopy that will favour Sclerotinia in addition to delay crop maturity. Soil analysis are necessary to test for soil nutrients and add only the necessary amount of N-fertilizer.

Recommended Yara Solid Fertilizers for Oilseed Rape

yarabela extran granular ammonium nitrate fertilizer


33.5% N - Granular ammonium nitrate fertilizer suitable for use on all crops.

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16-15-15 + 6.5 SO3 - Granular fertilizer often used for winter cereals and oilseed rape to supply phosphate and potash together with nitrogen and sulphur.

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26%N + 35% SO3 a nitrogen and sulphur fertilizer based on ASN (Ammonium Sulphate Nitrate) for oilseed rape and crops that need more sulphur

Recommended Yara Foliar Micronutrients for Oilseed Rape

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A flowable liquid suspension fertilizer with a combination of micronutrients including manganese, magnesium, boron and molybdenum for foliar application to oilseed rape, brassicas and legumes.

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YaraVita BORTRAC 150

A liquid micronutrient fertilizer containing 150 g/l boron for foliar application to provide additional boron or to treat boron deficiencies in a wide range of crops.

Recommended Yara Liquid Fertilizers for Oilseed Rape

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A homogenous liquid nitrogen fertilizer typically used on both wheat and oilseed rape as a late foliar spray.

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CHAFER 11-10.3-10.3+S

A liquid NPKS fertilizer suitable for use on a wide range of crops including cereals and oilseed rape.

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CHAFER 18-27-0

A liquid NP fertilizer suitable for use on a wide range of crops, often used as a starter solution for autumn or spring establishment of oilseed rape and cereals.

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CHAFER N32+9.4 SO3

A liquid nitrogen + sulphur fertilizer suitable for use on a wide range of crops.