A. Covalent bond
B. Vander walls forces
C. Wire bond
D. None of the above
Soil Science
Which element can be fixed by smecitite……………….?
A. Mgº
B. Kº
C. NH2
D. Both b & c
Permanent change in soil is due to………………?
A. Ionic bonding
B. pH change
C. Covalent bonding
D. Isomorphic substitution
Gravimetric water is present in………………….?
A. Micro pores
B. Macro pores
C. Meso pores
D. None of the above
Vertical movement of water was studied by……………..?
A. Ziebig
B. Darcy
C. Kohler
D. Niel
When two or more functional groups of single ligand are coordinated to metal cation the complex is termed as……………….?
A. Chelate
B. Solution complex
C. Complex ion
D. All the above
pH of Pakistani soils is………………..?
A. 7.5
B. 12
C. 7
D. 14
Identify the fertilizer (s) containing potassium………………..?
A. SOP
B. MOP
C. Chilean salt peter
D. All the above
A soil is classified as sodic soil when………………….?
A. EC is 8.5
C. SAR is >13
D. All the above
The available from of nitrogen for plant is…………….?
A. NO3
B. NH4
C. Both a & b
D. None of the above