Soils that have more than 20% organic matter are termed as organic soils. These are also called:________?
A. Peat soil
B. solonchalk soil
C. Muck soil
D. Both a and c
Soil Science
Organic matter in Pakistani soils is generally:_________?
Organic matter in Pakistani soils is generally:_________?
A. less than 1 %
B. less than 10 %
C. 3 %
D. 5%
What is the formula of urea?
What is the formula of urea?
A. CO (NH2)2
B. NH2-CO-NH-CO-NH2
C. (NH4)2CO3
D. None of these
Potassium (K) fixation capacity is maximum in:____________?
Potassium (K) fixation capacity is maximum in:____________?
A. Vermiculite
B. Illite
C. Montmorillonitic
D. Amorphous clay
What is the pH of calcareous soils?
What is the pH of calcareous soils?
A. 8.0-8.5
B. 7.0-7.5
C. 8.5-9.0
D. 6.5-7.5
Which is/are dominating salt/s in alkali soil:
Which is/are dominating salt/s in alkali soil:
A. NaHCO3
B. Na2CO3
C. MgSO4
Both a & b
What are diatoms?
What are diatoms?
A. Soil Fungi
B. Soil Algae
C. Soil Bacteria
D. None of these
Which of the following crop takes N in ammonical form:
Which of the following crop takes N in ammonical form:
A. Wheat
B. Cotton
C. Rice
D. Mustard
The virus infecting bacteria is called:_________?
The virus infecting bacteria is called:_________?
A. Bacteroid
B. Bacteriophage
C. Bacterin
D. All of these
Fe is trivalent in which of the chemical compound:
Fe is trivalent in which of the chemical compound:
A. Fe (NO3)3
B. Fe2 (NO3)3
C. Fe3 (NO2)
D. None of these