Spring oilseed rape cultivation – everything you need to know
Key steps at the start of the growing season
The spring start of oilseed rape growth is the moment that determines the final yield. A correct assessment of overwintering condition and a rapid fertilisation response are absolutely essential for success.
Plantations established with Strip Till technology have a considerably thicker taproot, which allows the plant to regenerate faster after winter. Crop residues in the inter-rows curbed evaporation during autumn and winter.
The farmer's main task is to correctly balance the nitrogen dose and apply sulphur, which facilitates its uptake. In strip-till, the fertiliser placed deep in autumn is still available to the developed root system.
Assessing plantation overwintering
The first step is a thorough field inspection, paying attention to the condition of the root collar. Only plants with an intact core have a chance of delivering an optimal yield.
You should count the stand of healthy plants per square metre, which allows fertilisation plans to be adjusted. In strip-till we often observe a higher survival rate thanks to more stable soil temperature conditions.
If the stand exceeds 30 plants per m², the plantation qualifies to be kept, provided the plant distribution is even.
First dose of nitrogen and sulphur
Nitrogen application must be timed to the soil temperature and the phase of growth resumption. Applying too late results in a reduction of lateral branching, which lowers the yield.
Sulphur should be applied in parallel with, or slightly ahead of, nitrogen. About 1 kg of sulphur is required for every 5 kg of nitrogen applied, which guarantees full utilisation of this building-block element.
When using ammonium nitrate on soils managed under a strip system, you can expect less leaching of nutrients, an effect of the improved capillary structure.
Moisture management in the spring period
Spring droughts have become a climatic norm, requiring a change in approach to protecting soil water. Strip-till proves its advantage over conventional ploughing here.
We avoid deep loosening operations that could dry out the top layer of the profile. The mulch of crop residues naturally insulates the soil from the effects of the sun and wind.
In autumn the plants developed a deep root system in the precisely loosened strip, giving them access to water located below 30 cm depth.
Mistakes in fertiliser application
Spreading fertiliser onto frozen, bare soil leads to gaseous losses and surface run-off. In strip-till, residues hold the fertiliser granules in place.
Applying too high a single dose of urea in early spring slows its breakdown due to the low microbiological activity in cold soil.
Failing to check pH after winter is a common mistake – in an overly acidic environment even the highest NPK doses will not be taken up by the oilseed rape.
Herbicide protection in spring
Weed-control treatments must be carried out immediately after emerging weeds are identified. In strip-till, weed pressure is limited in the inter-rows covered with mulch.
We focus on eliminating mayweed and cleavers, which compete most strongly with oilseed rape for light during the stem-elongation phase.
We perform treatments within the optimal temperature window (above 8°C), ensuring precise coverage of the plants with the spray liquid.
FAQ – Frequently asked questions
When exactly should the first nitrogen dose be applied to oilseed rape?
We apply the first dose when regulations allow it and field conditions permit machinery access. The soil temperature should exceed 5°C so that the roots actively take up ions.
Does strip-till increase oilseed rape's resistance to frost?
Yes, oilseed rape in strip-till has a thicker, lower-set root collar, which increases tolerance to sub-zero temperatures. The mulch in the inter-rows acts as an insulating layer.