weeds

Question 1

Allelopathy:

Answer 1

Production of toxins by plants which

can affect neighbouring plants

Question 2

why are seeds controlled in crops

Answer 2

reduce compition, avoid pest and disease problems, minimise harvesting difficulties, improve crop quality, stop weed seed banks increaseing

Question 3

why is there so many seeds in soil

Answer 3

each weed plant produces thousands of seeds, these seeds will only germinate if conditions are suitbale
and they can last for years or decades untill conditions do suit

Question 4

type of weeds likely to estblish

Answer 4

in crops annual weeds are likely to establish as soil will be bare for a certain period.

Question 5

how to controll weeds

Answer 5

quick establishment of crops, pasture cover year round to stop weed establishing.

Question 6

why are perennials harder to kill than annuals

Answer 6

perennuals have dorman buds and stored food reserves.

due to tap root and creeping root system they can be har to kill.

Question 7

how are perennials more likely in certain habitats

Answer 7

they dont like frequently disturbed soil as they have a slower growing cycle but dominate when they do not have to re establish.