Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
15 Cards in this Set
- Front
- Back
|
What is Organic fertiliser? |
Any substance that is derived from living material, generally required to be broken down by soil bacteria |
|
|
Advantages of organic fertiliser |
Useful residues No excessive salt build up Not easily leached from soil Improves soil structure |
|
|
Disadvantages of organic fertiliser |
Expensive Provide small amount of nutrients Provides variable amounts of npk Applied to soil in large quantities |
|
|
What is inorganic fertiliser? |
Derived from non living source, usually of mineral in origin or synthetically produced |
|
|
Advantages of inorganic fertiliser |
Generally cheap Provides large amounts of nutrients Normally only provide npk Applied to soil on small quantities |
|
|
Disadvantages of inorganic fertiliser |
Little residual value More likely to produce excessive salt concentrates Easily leached from soils Does not improve soil structure |
|
|
Base dressing |
The application of fertiliser to soil prior to planting or sowing |
|
|
Top dressing |
The application of fertiliser around a growing crop |
|
|
Liquid feeding |
The application of fertiliser dissolved in water to soil in which plants are growing, fast acting |
|
|
Foliar feeding |
The application of fertiliser directly to plant foliage giving a rapid response, care should be taken to avoid scorched leaves |
|
|
What is Straight fertiliser? Advantage? Disadvantage? Example? |
A fertiliser supplying only one nutrient Adv- relatively cheap Dis- labour intensive if more than one applied Exa- dried blood |
|
|
What is a Compound fertiliser? Advantage? Disadvantage? Example? |
One which supplies two or more plant nutrients Adv- often more concentrated and can be made up to suit crops needs with a more uniform composition. Dis- the cost of mixing and compounding adds to price Exa- Vitax Q4 |
|
|
What is slow release fertiliser? Advantage? Disadvantage? Example? |
Designed to release nutrients over a period of time Adv- much more even growth pattern Dis- high cost Example- Osmocote |
|
|
What is Granular fertiliser? Advantage? Disadvantage? Example? |
Formed by drying a slurry of different plant nutrients in a heated rotating drum producing a rough textured irregular granule. Adv- easier to handle and place Dis- expensive Exa- SAI mini crumb |
|
|
What is prilled fertiliser? Advantage? Disadvantage? Example? |
A special manufacturing process that produces smooth spherical droplets that solidify as they cool Adv- very easily dispersed Dis- expensive Example- Osmocote |
