Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

AGRI 32 | LECTURE | EXAM 2 > Lecture 8: Soil and Nutrient Management Practices > Flashcards

Lecture 8: Soil and Nutrient Management Practices Flashcards

1
Q

PROCESSES CAUSING NUTRIENT LOSS

A
  1. leaching
  2. volatilization
  3. erosion
  4. crop nutrient removal
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

LEACHING

A
  1. through percolation
  2. minimized by timely application of fertilizer; improvement of WHC
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

VOLATILIZATION

A
  1. nutrients in gaseous form
  2. ammonium forming fertilizers (ammonium sulfate; urea)
  3. minimized by covering the fertilizer with soil
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

EROSION

A
  1. through loss of topsoil
  2. minimized by adopting soil and water conservation practices
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

CROP NUTRIENT REMOVAL

A
  1. through uptake by plants
  2. minimized by applying fertilizers corresponding to nutrient removed by plants
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

FERTILIZATION

A
  1. application of fertilizer
  2. affected by crop species, age, and existing nutrient level in soil
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

APPLICATION OF HIGHER PROPORTION OF N

A
  1. early vegetative stage
  2. after harvest (perennials)
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

APPLICATION OF HIGHER PROPORTION OF K

A
  1. reproductive stage
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

COMPLETE FERTILIZER

A
  1. NPK
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

METHODS OF DETERMINING FERTILIZER REQUIREMENT

A
  1. field fertilizer trial
  2. nutrient deficiency symptoms
  3. soil analysis
  4. tissue analysis
  5. crop nutrient removal
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

FIELD FERTILIZER TRIAL

A
  1. effect of various levels of fertilizer
  2. interaction of fertilizer with existing external factors in given site
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

DISADVANTAGE OF FIELD FERTILIZER TRIAL

A
  1. reliable but expensive
  2. long period
  3. valid only on specific site
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

SOIL ANALYSIS

A
  1. chemical analysis of representative soil sample
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

ORGANIC MATTER

A
  1. native source of N in soil
  2. low: < 2%
  3. medium: 2-3%
  4. high: 3.5%
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

P DEFICIENCY

A
  1. P < 10 ppm
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

K DEFICIENCY

A
  1. K < 0.4 m.e./100 g soil
17
Q

TISSUE ANALYSIS

A
  1. chemical analysis of plant tissue
18
Q

TISSUE ANALYSIS: CRITICAL NUTRIENT LEVELS

A
  1. N: 2.2 - 2.4%
  2. P: 0.04 - 0.11%
  3. K: 0.7 - 1.1%
19
Q

CROP NUTRIENT REMOVAL: PINEAPPLE (36000 plants/ha)

A
  1. N: 200kg
  2. P2O5: 47kg
  3. K2O: 71kg
20
Q

CROP NUTRIENT REMOVAL: GINGER (40 tons/ha)

A
  1. N: 127kg
  2. P2O5: 66kg
  3. K2O: 167kg
21
Q

SYNTHETIC FERTILIZER

A
  1. mostly inorganic
  2. readily soluble
  3. immediate effect
  4. high concentration of particular nutrients
  5. caused increased acidity
22
Q

NATURAL FERTILIZER

A
  1. mostly organic
  2. slow nutrient release
  3. low amount of various nutrients
  4. promote good soil physical characteristics
23
Q

SOURCES OF NATURAL FERTILIZERS

A
  1. animal manure
  2. crop residue
  3. green manure
  4. compost
24
Q

PLACEMENT OF FERTILIZER

A
  1. as close to the root
  2. direct seeded crops: small amount; bottom or beside furrow/hill
  3. transplanted: dissolved fertilizer; drenched at base of seedlings
  4. trees: area of greatest concentration of roots; within canopy dripline
25
Q

PLACEMENT OF FERTILIZER: TREES

A
  1. lanzones: 1.5m
  2. coconut: 1.2m
  3. papaya: 0.3m
  4. citrus: 0.6 - 0.9m
  5. cacao: 0.6 - 0.9m
26
Q

METHODS OF FERTILIZER APPLICATION

A
  1. broadcast method
  2. band or trench
  3. foliar application
  4. fertigation
27
Q

BROADCAST METHOD

A
  1. spread uniformly
  2. lowland rice
  3. trees (within canopy dripline followed by shallow cultivation)
28
Q

BAND OR TRENCH

A
  1. applied at bottom of furrows or side of seedlings during plant
  2. for trees, applied in holes or trenches dug within canopy dripline
29
Q

FOLIAR APPLICATION

A
  1. sprayed to leaves
  2. applying of micronutrients and diluted solution of macronutrients
30
Q

FERTIGATION

A
  1. applied through drip irrigation system
  2. base of newly transplanted seedlings
31
Q

SITE-SPECIFIC NUTRIENT MANAGEMENT

A
  1. nutrient omission plots
  2. plant need-based N management approach
  3. use of all nutrient sources

AGRI 32 | LECTURE | EXAM 2 (8 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions