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CSS :: Windbreaks - Shelter belts


1.  Windbreaks/shelterbelts cover:
A. Trees and / or shrubs can substantially improve the productivity of farmlands B. They are exposed to strong winds
C. Both (a) & (b) D. None of these

2.  The kind of windbreak is:
A. Trees and shrubs best suited or preferred by the farmer how much space is available B. And whether the land is irrigated or rain fed.
C. Both (a) & (b) D. None of these

3.  How windbreaks functions is:
A. The air is baffled and mixed as it hits the wind breaks B. Causing a disruptive turbulence patterns which spoils the energy and velocity of the wind
C. This mixing and churning continues as the pressure gradient is built by the windbreak and the air leaks through or rolls over the top of the screen D. All of the above

4.  The best windbreaks approach is 100% crown density in the low-profile shurb, rows, and _____ density in the tall rows:
A. 50% B. 60%
C. 70% D. 80%

5.  In Pakistan, because of small field size, most often 2 or 3 rows windbreaks are used, and should expect the effects to reach only about 12H downwind and _____ upwind:
A. 1H B. 2H
C. 3H D. 4H

6.  A windbreak with 50% crown density is more effective than one of either 100% or of ______ density:
A. 15% B. 20%
C. 25% D. 30%

7.  Influence on crop yields is:
A. Are carefully measured at various points on a line perpendicular to the center of the windbreak B. By calculation, it can be shown that the total potential yields for most crops will be 2-10% greater on the field
C. Both (a) & (b) D. None of these

8.  After proper design and establishment of the windbreak, the farmer needs to pay particulr attention to a key management needs:
A. Grazing protection B. Fire protection
C. Pruning D. Harvesting
E. All of the above    

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