Oilseed Rape Flashcards
Why is there a need for break crops?
Disrupts weed and pests cycles
Spreads workload and risk
What is the average UK yield for oil seed rape?
3.4t/ha
How much of the oil seed rape yield is used for oil?
45%
What disease is OSR susceptible to in Autumn?
Phoma leaf spot
What disease is OSR susceptible to in Spring?
Phoma stem canker
What soils suit OSR?
Non waterlogged or compacted soils
What PH level does OSR need?
pH6.5
When is OSR sown?
August- mid September
How deep into the moisture does OSR need to be?
2-3cm deep
What is the seed rate for the optimum yield?
25-35 plants per m squared
Why are seed rates lower for hybrid OSR types?
Establishment % should be higher
Why is low disturbance drilling important for OSR?
2 examples
Conserve moisture
Reduce black grass germination
What pests does OSR suffer from?
2 examples
Slugs
Pigeons
What does insecticides prevent in OSR?
Aphids carrying yellow turnip virus
Why is weed control in OSR start with pre emergence or early post emergence herbicides?
OSR is not very competitive at first especially to broad leaf weeds
What are the two main disease problems in the autumn/ early spring?
Phoma leaf spot
Light leaf spot
When are two 1/2 a dose applications of fungicide applied?
Autumn And Spring
How can you adjust canopy size and weight?
Seed rate
Nitrogen rate and timing
What is the main pest at late March early April?
Pollen beetle
When is petal fall?
Late April to mid May
What disease is a risk at petal fall?
Sclerotinia
When is OSR harvested?
From mid July
What yield is expected from mid July?
3.4t/ha
