Herbicides and Crop Production

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What is the primary function of a selective herbicide?

To kill or retard the growth of unwanted plants (correct)

To irrigate the turfgrass

To fertilize desirable species

To prune the turfgrass

What can excessive rates of 2,4-D cause to stressed turfgrass?

Kill all weeds instantly

Promote healthy growth of turfgrass

Injure the turfgrass (correct)

No effect on turfgrass

What is the primary reason for herbicidal selectivity?

Environmental factors and application rates

Herbicide structure and plant features (correct)

Type of herbicide used

Genetic changes in plants

What can induced selectivity be achieved through?

Genetic changes in plants or hindering herbicide action Signup and view all the answers

What happens when too little herbicide is applied?

No weed control Signup and view all the answers

What is the dynamic process that involves the interaction of the plant, herbicide, and environment?

Herbicidal selectivity Signup and view all the answers

What is the effect of applying 0.5 to 1.3 kg/ha of herbicide to the soil before sowing on the protein content of wheat?

It increases the protein content Signup and view all the answers

Which of the following crops is sensitive to spray drift of 2,4 D?

Cotton Signup and view all the answers

What is the effect of applying amitrole at 10 to 100 ppm to tobacco or wheat?

It causes chlorosis due to chloroplast malformation Signup and view all the answers

What is the term used to describe the ability of a herbicide to kill or inhibit certain weeds without harming the desired crop?

Selectivity of herbicides Signup and view all the answers

What is the effect of simazine at 0.06 ppm on maize?

It increases nutrient uptake and yield Signup and view all the answers

Why can soil residues of herbicides affect germination of sensitive crops?

Because they can remain in the soil for a long time Signup and view all the answers

What is the term for the phenomenon where plant species respond differently to different herbicides?

Herbicidal selectivity Signup and view all the answers

What is the fundamental principle of herbicide selectivity?

More toxicant reaches the site of action in target plants than in non-target plants Signup and view all the answers

What is one of the ways that differential absorption of herbicides can occur?

Through aqueous spray spots Signup and view all the answers

Why are crops covered and grow below the soil limited in their ability to respond to herbicides?

Because they are not exposed to the herbicide Signup and view all the answers

What is a consequence of differential deactivation of the applied herbicide?

Increased herbicide selectivity Signup and view all the answers

Herbicides and Crop Production

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