A. 12.5 % -12.5 % – 75%
B. 64.7 % – 27.4 % – 7.9 %
C. none of A & B
D. 7.9% – 27.7 % – 64.4
Soil Science
Losses of soil water not includes………?
A. Direct evaporation from the soil & transpiration from vegetation
B. down-ward drainage
C. Hydroponics loss
D. Surface run-off from the field
In Pakistan there is general deficiency of rainfall. It varies from 125 mm annually in upper Sindh to about 900 mm in the sub-mountainous of northern Pakistan. In Balochistan the mean annual rainfall is about 200 mm, diminishing to …….. mm in the desert of Kharan:
A. 100 mm
B. >70 mm
C. <50 mm
D. None of these
……… erosion is the removal of a thin layer of soil by water acting over the whole surface. This type of erosion damaged very fertile lands located on slopes, some of which have been eroded to a depth of about 15 cm.
A. Rain splash rill erosion
B. Stream bank erosion
C. Sheet erosion
D. Gully erosion
Soil samples are collected:
A. From the field with immediate application of fertilizer or amendments
B. Field with upper white layer of salts
C. Boundaries of the field
D. None of these
Clay and humus particles are referred to as colloids and are less than 0.002mm. Due to their small size, colloids have ……………. surface area which provides surface for adsorption, catalysis, precipitation and microbial colonization:
A. Extremely low
B. Extremely high
C. Very little
D. None of these
The tension of the water at the upper plastic limit is equivalent to pF value:
A. 1
B. 2
C. 2.5 – 3.5
D. 0.5
The percentage of calcium content in single superphosphate?
A. 24%
B. 25%
C. 19.5%
D. 30%
Ground water refers to the……..?
A. Water quality determination
B. Aquifer location
C. Water regulation
D. Installation of wells
What is the effect of application of P2O5 fertilizer to a green manure leguminous crop in the availability of phosphorus to the succeeding crop?
A. Green manure increases the availability in organic from to the next crop
B. It does not affect the availability of phosphorous to succeeding crop
C. Greater amount of phosphorus is taken up and converted into organic form, which is released on decomposition of green matter
D. It fixes the P2O5 through humus and reduces the availability..