White irregular spots between veins of upper leaves of maize plant shows deficiency of:
A.Copper
B.Molybdenum
C.Manganese
D.Boron
Category: Soil Science Mcqs
As plants grow to maturity, the concentration of plant nutrients changes. What kind of change occurs in respect of N, P, K, Ca and Mg?
A.Concentration of all 5 elements decreases
B.N and P decrease K, Ca and Mg increase
C.N, P and K decrease K, Ca and Mg increase
D.N, P and K increase, Ca and Mg decrease
A pH value of 6.0 indicates that the soil reaction is:
A.Acidic
B.Alkaline
C.Neutral
D.Highly alkaline
Apatite is a group of minerals which mainly contains:
A.Sulphur
B.P2O5
C.N2
D.Titanium
1.6 to 2.3 value of nutrient index indicates:
A.Average fertility of soil
B.Adequate fertility of soil
C.Both of the above
D.None of the above
Amount of K in soil plough layer is about:
A.1,000-10,000 kg/ha
B.10,000-70,000 kg/ha
C.5,000-6,000 kg/ha
D.8,000-10,000 kg/ha
Available phosphorous of less than 10 kg/ha of soil is considered as:
A.Low
B.Medium
C.High
D.Trace
A man made epipedon in many characters except P2O5 content (more than 250 ppm) is:
A.Hisitic epipedon
B.Ochric epipedon
C.Anthropic epipedon
D.Umbric epipedon
A soil absorbs about _____ of incoming solar radiation:
A.5%
B.10%
C.15%
D.20%
Ammonium and potassium ions are apparently just the right size to fit into the cavities between the crystal units of:
A.Kaolinite
B.Montmorillonite
C.Vermiculite
D.None of these
