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
Related Mcqs:
- Norman Borlaug, the American agricultural scientist and plant pathologist developed the high yield strains that greatly increased crop yields. He laid the groundwork for the green revolution and was awarded the Nobel Prize for Peace in ________
A. 1970
B. 1972
C. 1974
D. 1976 - Influence of even-aged and un-even aged groups on the tree (differences) are:
A. To bole length
B. To growth rings
C. To shade
D. To number of trees
E. All of the above - Conditions or factors which influence the crown closure is:
A. Manner of formation of the stand
B. Quality of soil
C. Soil moisture
D. All of the above - Influence of climate means:
A. It is not compulsory that within a local climatic area only a particular tree grows wel
B. We know that southern aspects are hotter than northern aspects
C. Both (a) & (b)
D. None of these - Influence of soil and moisture conditions means:
A. If soil is properly worked and weeding is carried out then any local spp can be planted nan area
B. It has been seen that in spite of high early success there is failure later on
C. Both (a) & (b)
D. None of these - Opening of canopy by scattered gaps, young crop more or less even-aged in which system:
A. Uniform system
B. Group system
C. Irregular system
D. Strip system - What are the contents of yield tables in term of main crop:
A. Average diameter
B. Average height
C. Total basal area
D. Number of trees
E. All of the above - To prevent wind and water erosion, the crop is sometimes harvested in such a way that a basal stub of the plant is left behind. This phenomenon is called:
A. Ley farming
B. Mulching
C. Basin listing
D. Strip cropping - Measurement of increment of crop is:
A. From yield table
B. Estimation of movement rations from average diameter growth by diameter class
C. Increment determination by control method
D. Increment by continuous forest inventory (CFI)
E. All of the above - Nurse crop is:
A. Trees are raised with the preliminary object of helping a less hardy species
B. They are usually removed at an early stage as soon as they have served this purpose
C. Both (a) & (b)
D. None of these
The correct answer to the question: "Influence on crop yields is:" is "Both (a) & (b) ".
