Rotation of crop is essential for:

Related Mcqs:

1. The plants commonly sown for crop rotation are :

   A. Cajanus and Dalbergia
   B. Cajanus and Aeschynomene
   C. Dalbergia and trigonella
   D. Trigonella and Trifolium

2. The major kinds of rotation are:

   A. Physical
   B. Silvicultural
   C. Technical
   D. Rotation of the greatest volume production
   E. All of the above

3. A minima rotation worth the name is specified which corresponds to the age at which the trees reach the exploitable size which is usually 120 years, but is 150 years for the deodar, fir and kail in the moist zone of Kaghan 200 years for the ry zone of ______

   A. Swat
   B. Naran
   C. Kaghan
   D. None of these

4. If the same crop is repeatedly grown in a field:

   A. Nitrogen starvation many result
   B. Specific mineral deficiency may arise
   C. Soil will become prone to diseases
   D. Water level in soil will recede

5. 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

6. Opening of canopy even young crop more or less even aged and uniform felling happing under:

   A. Uniform system
   B. Group system
   C. Irregular system shelterwood system
   D. Strip system

7. Form of forest produced by retaining certain trees of the old crop after regeneration is completed known as:

   A. High forest with standards
   B. Selection system
   C. Two-storied high forest
   D. None of these

8. From the onwards the coppice crop will be thinned on a ______ cycle:

   A. 5 years
   B. 7 years
   C. 10 years
   D. None of these

9. Spraying of DDT on crop produces pollution of:

   A. Air only
   B. Air and soil only
   C. Air, soil and water
   D. Air and water only

10. 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