test 3* Flashcards
abiotic systems are coused by
environment
which bird has been reported to dramatically reduce corn stands
canada goose
in corn birs couse
ear damage
if brittle snap ocurs below the growing point at the v5 stage will corn recover
no
what is the primary reason corn does not grow to its full potential
drought
droughts affect the plants ability to take up
water nutrience
in corn drought tolerance is influenced by 2
root structure and hybrid selectoin
what is the most common syptom of drought in corn
leaf wraping
what are two areas of the field that drought would happen the least
course soils
high topography
what drought stress is the most critical yield on corn
tassling to silking
what are 4 effects of drought in soybeans
reduced stands
seed dieing during germinatoin
leaf colour
leaf showing puckering
how many essensial plant nutrients are there
17
what three nutrients are never defitint
carbon hydrogen oxygen
what are three macronutrients
nitrogen phospourus and potasium
what are 8 micronutrients
boron
chlorine
cobalt
copper
iron
magnesium
molybenum
zinc
what are three ways nutrients are lost
plant usage
leaching
irriversable chemical reactoins
what three nutruents are less avalible at high soil ph
boron magnezium zink
what three nutrients are less avalible on low ph soils
calcium
magnesium
molybendimium
sulfur
organic matter can be a source of what two nutrients
nitrogen
sulfur
which nutrient deficiency is more common in alfalfa under dry conditions
phosphorus
which nutrient deficentcy in corn is more common during cold springs
zinc
where do deficency symbtops of mobile nutrients first appear on the plant
old leafs
what are six mobile nutreints
nitrogen
phosspherus
potsatium
magnesium
molybendium
chlorien
where does deficentcys of inmobile desiese first apper
new growth
what are seven immobile nutrients 6
boron calcium copper iron magnese zinc
nutrient deficientcies with noticable feild patterns may be due to influence by 8
soil ph
soil om
soil type
soil compactoin
topography
erosoin
tile drains
past managment
what two nutrient deficences are common in organic soil
magnanese
zinc
what is a couse of low soil ph
aluminum toxicity
what are seven affects of low ph on cereals
thickening of roots
poor tillering
wilted flattened prostrate
stunted growth
purpling of leafs
reduced root system
yeild loss
what are two deficencys coused by compactoin
magneze and zinc
severe erosoin can couse mixing of soils what are 3 deficenctd
boron magneze and zinc
how do root rots couse nutrient deficiencys
restrict roots ability to absorb a nutrient
what five factors will assist you in diagnosing nutrient deficiency
where in the plant
colour change in the plant
observe pattern in field
get field history
tissue test
is nitrogen moble or inmoble
mobile
where do nitrogen deficiencys first appear on the plant
older leafs
what are five couses for nitrogen deficiency in corn
stunted spindly growth
v shaped yellow orange at tips of leafs
pale yellowish green
thin weak stalks
ears pinched at the tips
what are five nitrogen deficiantcys in wheat
stunted growth
reduced root mass
small leaf size
lower leaves turn yellow
adverse effect in spikelet formatoin
describe the phosphorus defincy in corn 1
purplish cast to the plant
five couses for nitrogen deficencys in a plant
wet soil
dry soil
sandy soil low in om
soil compacktoin
high residue ties up nitrogen
`
describe Potasium deficency in alfalfa
small yellow dots
what crop does boron deficency occur in
alfalfa
what are four iron deffish in soybean
intervienal yellowing
brown spects
stunting
brown leaf margins and plant death
describe magnesium defficent in soybeans 2
intervienal areas pale green yellow
viens remain green
decribe sulfur deficent in wheat 3
overall pale and stunting
lower leaves are pale greem
upper leaves in advance stages change from yellow to white
what crop does zinc deficency occur in
corn
what couses fertilizer burn
and 4 symptoms
fertilizer is placed to close to roots
uneven emergence
roots tur brown
sime plants are afffected will othehrs are not
poor germinatoin
