Chapter One Flashcards
How do cover crops work?
Physical Suppression and Allelochemicals
What is an allelochemical?
Phytotoxins that inhibit germination of plant growth
Are physical barriers good for perennials?
No
How does weed suppression and crop tolerance to cover crop differ?
Region
Soil type
Soil fertility
Environment
Legumes cover crop can be characterized as?
Short Persistent of residue and appears to stimulate weed emergence in non-treated plots.
Cereal cover crops can be characterized as?
residue persistent throughout the growing season, Controls palmer amaranth and has no negative effects on soil applied herbicides
What is a weed?
A plant growing where it is not desired.
What is an herbicide?
Any chemical or cultured biological organism used to destroy, prevent, suppress or control plants.
Can a herbicide damage a cash crop?
yes
Is it possible to a microorganism as a herbicide?
Yes
What 4 pests do pesticides target?
Weeds
Insects
Nematodes
rodents
What is the purpose of weed control?
To manage or manipulate pest so they are no longer an economic threat.
What is considered a withdrawal to the seed bank?
Germination of seed, fungal decay of seed and insect removal of seed
What is a seed bank?
seed that has been produced and then drop into the soil
When where herbicides discovered?
1940’s then following, the science of weed science picked up in the 1950’s
