The most abundant metal in the earth’s crust and toxic to plants in low concentration is____________________?
A. Mo
B. Al
C. Fe
D. All the above
The salinity can be reduced by the application of___________________?
The salinity can be reduced by the application of___________________?
A. Lime
B. Sulphuric acid
C. Urea
D. All the above
Soil moisture and ET losses are_________________?
Soil moisture and ET losses are_________________?
A. Inversely related
B. Directly related
C. Not related
D. Occasionally related
Particular matter consists of____________________?
Particular matter consists of____________________?
A. Solid and gases
B. CO2 & N
C. Solid and liquid
D. None of the above
Nitrogen gases are involved in_____________________?
Nitrogen gases are involved in_____________________?
A. Sleepy feelings
B. Hair disease
C. Mental disease
D. Acid rains
A treeless artic plain is called as___________________?
A treeless artic plain is called as___________________?
A. Glaciers
B. Barren land
C. Tundra
D. None of the above
Biochemical reduction of nitrate to nitrite or gaseous nitrogen is called ________________________?
Biochemical reduction of nitrate to nitrite or gaseous nitrogen is called ________________________?
A. Reduction
B. Oxidation
C. Denitrification
D. None of the above
While diluting acid always add_____________________?
While diluting acid always add_____________________?
A. Acid to water
B. Water to acid
C. Both a & b
D. none
Organic P content in soil, by ignition method is estimated by igniting the soil at ____________________?
Organic P content in soil, by ignition method is estimated by igniting the soil at ____________________?
A. 250ºC
B. 1000ºC
C. 550ºC
D. 1250ºC
Boron concentration is irrigation water is considered safe only upto_________________?
Boron concentration is irrigation water is considered safe only upto_________________?
A. 0.7 ppm
B. 1.5 ppm
C. 2 ppm
D. 3 ppm