Lecture 4

Question 1

what are 5 adjustment factors for reference et

Answer 1

development
type
density
soil water
stress

Question 2

what are the two methods for aquiring Kc

Answer 2

mean kc-time averaged evap fluxes from soil incorporated

dual Kc - evap and evapotranspiration calculated seperatly

Question 3

time periods for each method

Answer 3

mean kc, monthly weekly daily

dual, daily hourly

Question 4

when is dual kc particularly applicable

Answer 4

when there is large variation in soil type and moisture

Question 5

two different curve methods for kc

Answer 5

FAO

wright

Question 6

what are the four stages to the Kc curve

Answer 6

initital
mid
end

Question 7

what does LAI stand for and what is the range

Answer 7

leaf area index 0 bare 6 dense

Question 8

what word means aging process

Answer 8

senescence

Question 9

what is senescene started by

Answer 9

production of abscissic acid in the roots

Question 10

rain event ranges (very light etc)

Answer 10

very light <3
light 5
medium 10
hevay 40

Question 11

what is TAW

Answer 11

total avaliable water, water content between permenent wilting point and field capacity

Question 12

what is RAW

Answer 12

readily avaliable water ( water uptake is reduced before PWP)

Question 13

four uses of mulch

Answer 13

evap
temp
erosion
weed control

Question 14

options for mulch

Answer 14

organic
inorganic
intercropping

Question 15

types of intercropping

Answer 15

contiguous

border

Question 16

what are the two effects that can effect kc, eg in desert

Answer 16

oasis-vegetation has much higher water avaliability than surrounding
clothsline-vegetation much taller

increase Kc

Question 17

what is management induced stress and what are some examples

Answer 17

using water stress to get more shit, like cotton, sugar beets-get more sugar