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Flashcards in Oilseed Rape Deck (23)
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1

Why is there a need for break crops?

Disrupts weed and pests cycles
Spreads workload and risk

2

What is the average UK yield for oil seed rape?

3.4t/ha

3

How much of the oil seed rape yield is used for oil?

45%

4

What disease is OSR susceptible to in Autumn?

Phoma leaf spot

5

What disease is OSR susceptible to in Spring?

Phoma stem canker

6

What soils suit OSR?

Non waterlogged or compacted soils

7

What PH level does OSR need?

pH6.5

8

When is OSR sown?

August- mid September

9

How deep into the moisture does OSR need to be?

2-3cm deep

10

What is the seed rate for the optimum yield?

25-35 plants per m squared

11

Why are seed rates lower for hybrid OSR types?

Establishment % should be higher

12

Why is low disturbance drilling important for OSR?
2 examples

Conserve moisture
Reduce black grass germination

13

What pests does OSR suffer from?
2 examples

Slugs
Pigeons

14

What does insecticides prevent in OSR?

Aphids carrying yellow turnip virus

15

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

16

What are the two main disease problems in the autumn/ early spring?

Phoma leaf spot
Light leaf spot

17

When are two 1/2 a dose applications of fungicide applied?

Autumn And Spring

18

How can you adjust canopy size and weight?

Seed rate
Nitrogen rate and timing

19

What is the main pest at late March early April?

Pollen beetle

20

When is petal fall?

Late April to mid May

21

What disease is a risk at petal fall?

Sclerotinia

22

When is OSR harvested?

From mid July

23

What yield is expected from mid July?

3.4t/ha