The percentage of calcium content in single superphosphate?
The percentage of calcium content in single superphosphate?
A. 24%
B. 25%
C. 19.5%
D. 30%
Soil Science
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The tension of the water at the upper plastic limit is equivalent to pF value:
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 -
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:
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 -
Soil samples are collected:
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 -
_________ 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.
_________ 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 -
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:
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 -
Losses of soil water not includes_________?
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 -
The relative abundance of three types of rocks ( igneous-metamorphic- sedimentary) in the earth’s crust is_________?
The relative abundance of three types of rocks ( igneous-metamorphic- sedimentary) in the earth’s crust is_________?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 -
Oxygen and Silicon together comprise approximately ______ %of the earth crust?
Oxygen and Silicon together comprise approximately ______ %of the earth crust?A. 64 %
B. 79 %
C. 75 %
D. 73 % -
Potassium (K) occurs as a constituent of the earth’s crust in the proportion of_________?
Potassium (K) occurs as a constituent of the earth’s crust in the proportion of_________?A. 23 %
B. 2.3 %
C. 17 %
D. 1.7 %