It is not advisable to apply fresh farmyard manure because

A. its heat of decomposition may cause scorching of plants

B. some microorganisms in the manure may die

C. the manure may increase soil acidity

D. the manure may increase soil alkalinity

Magnesium deficiency in crops can be corrected by the application of

A. dolomite

B. limestone

C. quicklime

D. urea

The atmosphere gains carbon dioxide through the following ways except

A. burning of fuel such as coal and wood

B. respiration by plants and animals

C. photosynthesis in plants

D. death and decay of plants and animals

Controlled burning has the advantage of

A. increasing the number of soil organisms

B. inducing re-growth of pasture grasses

C. increasing the amount of nutrients in the soil

D. improving soil structure

Which of the following fertilizers should be applied for good plant growth after prolonged use of sulphate of ammonia on a neutral soil?

A. ammonium nitrate

B. lime

C. urea

D. single superphosphate

Which of the following statements indicate advantages of sub-surface irrigation?
I. Low operation cost once established
II. Does not disturb the movement of implements
III. Permits efficient use of water
IV. easily floods the field

A. I,II and III only

B. II,III and IV only

C. I,II and IV only

D. I,II,III and IV

The removal of excess water from the sub-soil is known as

A. irrigation

B. drainage

C. evaporations

D. dehydration

The best source of farm power for agricultural production is

A. human power

B. animal power

C. mechanical power

D. solar power

The greatest disadvantage of using a bulldozer in land clearing is that it

A. removes the fertile top soil along with the vegetation

B. makes the soil lose its texture

C. allows the fast growth of weeds after clearing

D. increases the incidence of pests

Mechanization is difficult to practice where the

A. land is fragmented

B. farmer is wealthy

C. farm holding is large

D. soil fertility is low