lecture 10

Question 1

what is an essential element?

Answer 1

an element that is needed for completion of lifecycle

or

molecular constituent, without which the plant cannot perform the physiological functions needed to allow development to maturation

Question 2

what elements makes up 93% of plant dry mass?

Answer 2

C, O and H

Question 3

law of the minimum

Answer 3

yield is proportional to the amount of the most limiting nutrient

Question 4

vey mobile nutrients

Answer 4

N
P
K
Mg

Question 5

mobile nutrients show symptoms on…

Answer 5

older leaves first because nutrients moved to new growth

Question 6

moderately mobile nutrients

Answer 6

S
Cu
Fe
Mn
Mo
Zn

Question 7

immobile nutrients

Answer 7

B
Ca

Question 8

in what form(s) do plants assimilate mineral nutrients?

Answer 8

cations or anions

Question 9

what is the Hoagland nutrient solution?

Answer 9

highest possible nutrient concentrations without producing toxicity symptoms

Question 10

how do plants decrease soil pH

Answer 10

roots secreting hydrogen atoms

Question 11

what is the cation exchange capacity

Answer 11

degree to which a soil can absorb and exchange ions