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AGRI 32 | LABORATORY | EXAM 3 > Exercise 6: Nutrient Management > Flashcards

Exercise 6: Nutrient Management Flashcards

1
Q

FATE OF NUTRIENT ELEMENTS IN SOIL

A
  1. crop removal
  2. run-off and erosion
  3. fixation
  4. leaching
  5. volatilization
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2
Q

FERTILIZER

A
  1. substance added to soil to supply elements required for plant nutrition
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3
Q

FERTILIZER GRADE

A
  1. minimum guarantee of plant nutrient
  2. expressed in percentage total N, P, K
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4
Q

TYPES OF FERTILIZER GRADE

A
  1. oxide basis
  2. elemental basis
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5
Q

CONVERSION FACTOR: OXIDE TO ELEMENTAL

A
  1. %P = 0.436 x %P2O5
  2. %K = 0.829 x %K2O
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6
Q

CONVERSION FACTOR: ELEMENTAL TO OXIDE

A
  1. %P2O5 = 2.29 x %P
  2. %K2O = 1.20 x %K
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7
Q

FERTILIZER RATIO

A
  1. relative percentage of N, P2O5, and K2O in fertilizer grade
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8
Q

FERTILIZER RECOMMENDATION

A
  1. recommended rate of fertilizer application
  2. expressed in kg N, P2O5, and K2O
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9
Q

FILLER

A
  1. contain no fertilizer element
  2. added to complete weight of mixed fertilizers
  3. e.g. sand, sawdust, granular limestone
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10
Q

ORGANIC FERTILIZER

A
  1. natural organic materials
  2. derived from plants or animals, and some synthetic materials
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11
Q

NATURAL ORGANIC FERTILIZERS

A
  1. farm manure
  2. crop residues
  3. green manure
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12
Q

SYNTHETIC ORGANIC FERTILIZER

A
  1. urea [CO(NH2)2]
  2. calcium cyanamide (CaCN2)
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13
Q

CHARACTERISTICS OF NATURAL ORGANIC FERTILIZERS

A
  1. low element content
  2. slow availability
  3. limited supply
  4. promote good physical condition
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14
Q

INORGANIC FERTILIZER

A
  1. derived from natural inorganic materials, and synthetic inorganic ones
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15
Q

NATURAL INORGANIC FERTILIZER

A
  1. chilean nitrate of soda
  2. rock phosphate
  3. most K materials
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16
Q

SYNTHETIC INORGANIC FERTILIZER

A
  1. chemical reactions of certain raw material (petroleum)
17
Q

CHARACTERISTICS OF INORGANIC FERTILIZER

A
  1. high element content
  2. readily soluble
  3. fast release
  4. undesirable physical conditions
  5. unlimited supply
18
Q

CLASSIFICATION OF FERTILIZER BASED ON NUMBER OF FERTILIZER PRESENT

A
  1. single element
  2. incomplete
  3. complete
19
Q

FERTILIZER MANAGEMENT

A
  1. nutrient requirement of crop
  2. amount of nutrient the soil can supply

AGRI 32 | LABORATORY | EXAM 3 (6 decks)

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