Exam Flashcards
What does NV STAND FOR
Neutralising value
What is the NV for ground chalk and lime
50-55
What is the NV for sugar beet lime
22-32
What is NV
Neutralising value expressed as a % of calcium oxide
What do you add if soil is acidic
Add lime
What do you add if green
Nothing - neutral good for cereal rotations
What is a trap crop
A crop planted alongside a cash crop which appears more attractive to pests and diverts the pest pressure
Give examples of trap crops in potatoes
Reduces PCN by encouraging hatching but is then unstiable hosts so the nematodes can’t multiply and reduce in numbers
Give an example of trap crop in OSR
Turnip rape and CSFB- more attractive, diverts, borders less damaged, more research needed to understand mechanisms and how implementation can be optimised
What do you need to know for a new plot of land 8 things
Previous cropping history
When soil was last tested
NVZ’s
Soil type- drainage issues
NDVI maps/ terra maps
Previous yield issues - compaction
OM levels
Identify factors restricting permornce
What legislation for spraying
Water framework directive
Catchment sensitive farming - awareness to farmers and training - scheme by natura england
How does resistance work
Either TSR or enhanced metabolism
How does TSR work
ALS inhibitors and ACCase
What does ALSI inhibitors stand for
Aceotlactase synthesis
Give an example of an ALS inhibitor
Sulfonyrueas e.g mesofuluron
Or sulums
