A. Exposed crystal edges
B. Isomorphous substitution
C. Anion exchange
D. All of these
Soil Science
The indicator used for estimation of the soil available boron is…….?
A. Mixed indicator
B. Phenolpthalein
C. Diphenyle
D. Azomethine-H
The first mechanism to start in the wind erosion is………?
A. Creep
B. Saltation
C. Siltation
D. None of these
What is the optimum temperature and pH for nitrifying bacteria ?
A. 30-35 c, pH 5.5
B. >35 c, pH less than 5
C. 25-40 c, pH 8-8.5
D. All of thses
If a manure pile is exposed to the rain, what nutrient will be lost the most ?
A. Ca
B. Mg
C. S
D. N
Browning disease of rice is a………?
A. Bacterial & fungal disease
B. Physiological disease
C. Viral disease
D. The above statement is wrong
Loss of nitrogen in the form of NH3 in alkaline medium is known as………?
A. Denitrification
B. Leaching
C. Volatilization
D. None of these
Organisms satisfying their carbon requirement as Co2 from atmosphere and energy requirement from oxidation of simple inorganic compound are called as………?
A. Chemoautotroph
B. Photoautotroph
C. Saprophyte
D. None of these
1 meq of HCl is equal to………?
A. 1.4 mg of N
B. 14 mg of N
C. 0.14 mg of N
D. 140 mg of N
What kind of nitrogenous (N) fertilizers should not be used for flooded soil:
A. Ammonical
B. Nitrate
C. Ammonical-nitrate
D. Both B & C