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Crops > Oilseed Rape > Flashcards

Oilseed Rape Flashcards

1
Q

Why is there a need for break crops?

A

Disrupts weed and pests cycles

Spreads workload and risk

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2
Q

What is the average UK yield for oil seed rape?

A

3.4t/ha

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3
Q

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

A

45%

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4
Q

What disease is OSR susceptible to in Autumn?

A

Phoma leaf spot

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5
Q

What disease is OSR susceptible to in Spring?

A

Phoma stem canker

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6
Q

What soils suit OSR?

A

Non waterlogged or compacted soils

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7
Q

What PH level does OSR need?

A

pH6.5

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8
Q

When is OSR sown?

A

August- mid September

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9
Q

How deep into the moisture does OSR need to be?

A

2-3cm deep

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10
Q

What is the seed rate for the optimum yield?

A

25-35 plants per m squared

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11
Q

Why are seed rates lower for hybrid OSR types?

A

Establishment % should be higher

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12
Q

Why is low disturbance drilling important for OSR?

2 examples

A

Conserve moisture

Reduce black grass germination

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13
Q

What pests does OSR suffer from?

2 examples

A

Slugs

Pigeons

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14
Q

What does insecticides prevent in OSR?

A

Aphids carrying yellow turnip virus

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15
Q

Why is weed control in OSR start with pre emergence or early post emergence herbicides?

A

OSR is not very competitive at first especially to broad leaf weeds

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16
Q

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

A

Phoma leaf spot

Light leaf spot

17
Q

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

A

Autumn And Spring

18
Q

How can you adjust canopy size and weight?

A

Seed rate

Nitrogen rate and timing

19
Q

What is the main pest at late March early April?

A

Pollen beetle

20
Q

When is petal fall?

A

Late April to mid May

21
Q

What disease is a risk at petal fall?

A

Sclerotinia

22
Q

When is OSR harvested?

A

From mid July

23
Q

What yield is expected from mid July?

A

3.4t/ha

Crops (14 decks)

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