Lecture 6: Windbreak Establishment

Question 1

ADVERSE EFFECTS OF STRONG WINDS

Answer 1

1. abrasion
2. leaf tearing
3. defoliation
4. branch breakage
5. falling of fruit and flower
6. blow down of whole tree
7. uprooting

Question 2

MINIMIZING WIND DAMAGE

Answer 2

1. typhoon-free sites
2. deep soil
3. regular pruning
4. thin excess fruits
5. low-lying crops
6. plant windbreaks

Question 3

CHARACTERISTICS OF WINDBREAK TREE

Answer 3

1. extensive root system
2. strong branches
3. tall with dense canopy
4. fast growing (pili, agoho, mahogany, tamarind)

Question 4

WINDBREAK ESTABLISHMENT

Answer 4

1. plant in single or double rows near fence line and within orchard

Question 5

ROLE OF WINDBREAK

Answer 5

1. reduce windspeed

Question 6

FACTORS AFFECTING EFFECTIVENESS OF WINDBREAK

Answer 6

1. height: reduce windspeed up to maximum distance of 20x of its height
2. canopy density: 30% density (reduce to less than 80% speed and distance of 12x its height); 50% density (reduce to less than 80% speed and distance of 20x its height)

Question 7

RECOMMENDED SPECIES: TALL (>15m)

Answer 7

1. mahogany
2. santol
3. pili
4. nara
5. molave
6. tamarind
7. agoho

Question 8

RECOMMENDED SPECIES: MEDIUM (5-15m)

Answer 8

1. chico
2. kakawate
3. banaba

Question 9

RECOMMENDED SPECIES: SHORT

Answer 9

1. bougainvillea
2. achuete

Question 10

TIPS FOR WINDBREAK ESTABLISHMENT

Answer 10

1. rows oriented perpendicular to wind direction
2. first and last row: short to medium species
3. middle row: tall species