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AGRI 41 | LEC | MODULE 3 > Crop-Weed Interaction > Flashcards

Crop-Weed Interaction Flashcards

1
Q

CROP-WEED INTERACTION

A
  1. interference
  2. competition
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2
Q

COMPETITION

A
  1. two or more plants demand for the same resources
  2. resources being shared is limited
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3
Q

TYPES OF COMPETITION

A
  1. interspecific
  2. intraspecific
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4
Q

INTERSPECIFIC COMPETITION

A
  1. between plants belonging to different species
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5
Q

INTRASPECIFIC COMPETITION

A
  1. between plants of the same species
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6
Q

ESSENTIAL NUTRIENTS

A
  1. nitrogen
  2. phosphorus
  3. potassium
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7
Q

FACTORS INVOLVED IN CROP-WEED COMPETITION

A
  1. nutrient
  2. water
  3. sunlight
  4. space
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8
Q

CROWDING / SHADING

A
  1. due to close association of crop and weeds
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9
Q

INDICATOR OF COMPETITIVE ABILITY FOR LIGHT

A
  1. light transmission ratio (LTR)
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10
Q

LEAF AREA INDEX

A
  1. influence the light transmission ration
  2. more leaves = lower LTR
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11
Q

FACTORS AFFECTING ABILITY OF WEEDS TO COMPETE

A
  1. species
  2. density
  3. distribution
  4. duration of growth
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12
Q

FACTORS AFFECTING DEGREE OF COMPETITION

A
  1. weeds species
  2. density
  3. time of competition
  4. duration of competition
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13
Q

CRITICAL PERIOD OF COMPETITION

A
  1. time when crop is very sensitive to weed competition
  2. guide for weed management
  3. varies with the crop
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14
Q

INDICATORS OF CPC

A
  1. first 25-33% of crop growth
  2. canopy formation
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15
Q

OPEN CANOPY

A
  1. canopy is not yet formed
  2. weeds growing at this point will impact crop growth
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16
Q

CLOSED CANOPY

A
  1. canopy is already closed
  2. crops are able to shade out emerging weeds
17
Q

ALLELOPATHY

A
  1. form of interference besides competition
  2. impact crops via production of toxins
  3. may harm or benefit crops
18
Q

SHIFT IN WEED POPULATION

A
  1. due to selection pressure in environment (climate; changing the crop)

AGRI 41 | LEC | MODULE 3 (5 decks)

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