Biological nitrogen fixation is:
A.Aerobic
B.Anaerobic
C.Both (a) & (b)
D.None of the above
Category: Soil Science Mcqs
Available nitrogen of less than 280 kg/hectare is considered:
A.Low
B.Medium
C.High
D.Trace
A soil, which has pH more than 8.5, ESP more than 15 and EC less than 4 mmhos/cm at 25?C, is called:
A.Saline soil
B.Alkaline soil
C.Saline alkaline soil
D.All of the above
Alluvial soils are rich in:
A.K2O, P2O5 and Lime
B.N
C.Fe, A1
D.Si, Cu
A vertical section of the soil through all its horizons are extending into the parent material is known as:
A.Soil horizons
B.Solum
C.Profile
D.None of the above
Acid soils can be reclaimed by:
A.CaCO3
B.H2SO4
C.Ca SO4.2H2O
D.HNO3
Blue-green algae grows best in:
A.Upland rice
B.Jute
C.Lowland rice
D.Sorghum
Active soil forming factors would include:
A.Vegetaion and topography
B.Time, topography and climate
C.Time and vegetation
D.Vegetation and climate
