A. 6
B. 7
C. 4
D. None of the above
Soil Science
According to a latest research, Pakistan is predominantly a dryland country; 80% of its land area is arid and semi arid, 12% sub-humid and 8% under humid climate. Thus , soils of arid & semi-arid regions are vulnerable to a wide range of degradation process. As the case in arid and semi-arid climates elsewhere in south-central/southern Asia and Sub-Saharan Africa; …………….. are among the major causes of soil degradation and desertification?
A. Drought stress
B. Accelerated erosion & salinization
C. Depletion of soil fertility and SOM
D. All of the above
The major soil fertility problems in Pakistani soils deficiencies of N, P and Zn. Deficiencies K, Fe, and B also occur in specific crop genotypes or soil types, while deficiencies of S, Cu, and Mn are negligible. however, the common nutrient deficiencies are……………..: and some micronutrients including Mo?
A. N, P, K
B. Ca, Mg, S
C. both A & B
D. The above statement is wrong
The diagnostic techniques used in evaluating soil nutrient status and determining fertilizer requirements of the crop include:
A. Nutrient deficiency symptoms & field experimentation
B. Greenhouse pot experimentation & soil testing
C. Plant analysis
D. All of the above
From the point of view of crop production, Soil testing refers to…………..?
A. Laboratory analysis assessing plant available nutrient status
B. Collection of plant leaves samples only
C. Salinity & elemental toxicity of a soil
D. Both A & C
Rocks and weathered materials transported by ……….. ,act as initial materials for soil formation?
A. Water
B. Wind
C. Glaciers
D. All of the above
Weathering process-physical, chemical, and biological ……………, the rocks and minerals into simpler products which either accumulate in place or are transported to other places where they become soil parent materials?
A. Disintegrate
B. Disentigrate
C. Decompose
D. Both a & c
‘A’ horizon of the soil is also designated:
A. Eluvistal horizon
B. Illuviated horizon
C. Alluvial horizon
D. None of the above.
Basalt is a ………. rock:
A. fine-grained
B. Dark coloured
C. both A & B
D. None of the above
………….. consist of particles that are produced by disintegration of pre-existing rocks through the process of weathering:
A. Clastics
B. Non-clastics
C. both A & B
D. None of the above