Chapter One Flashcards
- What do weeds compete with crops for?
Light, Nutrients & Water
- Nutrients like Nitrogen, and Potash can often be short in supply to crops and additional fertilisers may have to be sown.
Phosphorous
- What do we mean by an annual / biennial / perennial weed and give an example of each?
Annual: Plant begins from a seed and completes its life cycle within the year – new plants begin to seed the following year (Chick weed)
Biennial: plant that takes two years to complete its life cycle fount in grassland as tillage would destroy their life cycle (ragwort)
Perennial: one that can survive for many years, they can build up a food reserve which make them difficult to control (docks, thistles & nettles)
- How many seeds can one dock plant produce in a year?
14000
- Noxious Weeds Act was put in place to help prevent the growth of undesirable plants & you could be fined if they were found on your farm. What year did this act come into place?
1936
- Viruses often rely on another agent such as an aphid to transfer them from one plant to another. These agents are known as
Vectors
- Name a fungal disease that affects:
Potatoes & Cereals
Potato Foliage Blight
Cereals Loose Smut on wheat
- Viruses can affect all parts of the plant; the root, stems, leaves and fruit. Give an example of a virus in cereals.
Barley Yellow Dwarf Virus
- Give one example of risks of plant protection products.
Personal Risks – (Human Health)
Risks to third parties
Environmental Risks
Risks to Non Target Organisms
Name a bacterial disease in an arable crop?
Black leg in potatoes.
Advantages of pesticides?
Harvesting problems due to weeds?
