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crop diagnostics > test 3* > Flashcards

test 3* Flashcards

1
Q

abiotic systems are coused by

A

environment

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2
Q

which bird has been reported to dramatically reduce corn stands

A

canada goose

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3
Q

in corn birs couse

A

ear damage

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4
Q

if brittle snap ocurs below the growing point at the v5 stage will corn recover

A

no

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5
Q

what is the primary reason corn does not grow to its full potential

A

drought

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6
Q

droughts affect the plants ability to take up

A

water nutrience

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7
Q

in corn drought tolerance is influenced by 2

A

root structure and hybrid selectoin

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8
Q

what is the most common syptom of drought in corn

A

leaf wraping

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9
Q

what are two areas of the field that drought would happen the least

A

course soils
high topography

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10
Q

what drought stress is the most critical yield on corn

A

tassling to silking

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11
Q

what are 4 effects of drought in soybeans

A

reduced stands
seed dieing during germinatoin
leaf colour
leaf showing puckering

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12
Q

how many essensial plant nutrients are there

A

17

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13
Q

what three nutrients are never defitint

A

carbon hydrogen oxygen

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14
Q

what are three macronutrients

A

nitrogen phospourus and potasium

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15
Q

what are 8 micronutrients

A

boron
chlorine
cobalt
copper
iron
magnesium
molybenum
zinc

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16
Q

what are three ways nutrients are lost

A

plant usage
leaching
irriversable chemical reactoins

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17
Q

what three nutruents are less avalible at high soil ph

A

boron magnezium zink

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18
Q

what three nutrients are less avalible on low ph soils

A

calcium
magnesium
molybendimium
sulfur

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19
Q

organic matter can be a source of what two nutrients

A

nitrogen
sulfur

20
Q

which nutrient deficiency is more common in alfalfa under dry conditions

A

phosphorus

21
Q

which nutrient deficentcy in corn is more common during cold springs

A

zinc

22
Q

where do deficency symbtops of mobile nutrients first appear on the plant

A

old leafs

23
Q

what are six mobile nutreints

A

nitrogen
phosspherus
potsatium
magnesium
molybendium
chlorien

24
Q

where does deficentcys of inmobile desiese first apper

A

new growth

25
Q

what are seven immobile nutrients 6

A

boron calcium copper iron magnese zinc

26
Q

nutrient deficientcies with noticable feild patterns may be due to influence by 8

A

soil ph
soil om
soil type
soil compactoin
topography
erosoin
tile drains
past managment

27
Q

what two nutrient deficences are common in organic soil

A

magnanese
zinc

28
Q

what is a couse of low soil ph

A

aluminum toxicity

29
Q

what are seven affects of low ph on cereals

A

thickening of roots
poor tillering
wilted flattened prostrate
stunted growth
purpling of leafs
reduced root system
yeild loss

30
Q

what are two deficencys coused by compactoin

A

magneze and zinc

31
Q

severe erosoin can couse mixing of soils what are 3 deficenctd

A

boron magneze and zinc

32
Q

how do root rots couse nutrient deficiencys

A

restrict roots ability to absorb a nutrient

33
Q

what five factors will assist you in diagnosing nutrient deficiency

A

where in the plant
colour change in the plant
observe pattern in field
get field history
tissue test

34
Q

is nitrogen moble or inmoble

A

mobile

35
Q

where do nitrogen deficiencys first appear on the plant

A

older leafs

36
Q

what are five couses for nitrogen deficiency in corn

A

stunted spindly growth
v shaped yellow orange at tips of leafs
pale yellowish green
thin weak stalks
ears pinched at the tips

37
Q

what are five nitrogen deficiantcys in wheat

A

stunted growth
reduced root mass
small leaf size
lower leaves turn yellow
adverse effect in spikelet formatoin

38
Q

describe the phosphorus defincy in corn 1

A

purplish cast to the plant

39
Q

five couses for nitrogen deficencys in a plant

A

wet soil
dry soil
sandy soil low in om
soil compacktoin
high residue ties up nitrogen
`

40
Q

describe Potasium deficency in alfalfa

A

small yellow dots

41
Q

what crop does boron deficency occur in

A

alfalfa

42
Q

what are four iron deffish in soybean

A

intervienal yellowing
brown spects
stunting
brown leaf margins and plant death

43
Q

describe magnesium defficent in soybeans 2

A

intervienal areas pale green yellow

viens remain green

44
Q

decribe sulfur deficent in wheat 3

A

overall pale and stunting
lower leaves are pale greem
upper leaves in advance stages change from yellow to white

45
Q

what crop does zinc deficency occur in

A

corn

46
Q

what couses fertilizer burn
and 4 symptoms

A

fertilizer is placed to close to roots
uneven emergence
roots tur brown
sime plants are afffected will othehrs are not
poor germinatoin

crop diagnostics (5 decks)

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