A. Compost   

B. Humus

C. FYM    

D. None of these

A. forming P complexes

B. anion replacement of H₂PO₄^– from exchange complex

C. coating of Fe/Al particles

D. all the above

A. Inceptisol 

B. Vertisol

C. Aridsol 

D. None of these

A. Average fertility of soil

B. Adequate fertility of soil

C. Both of the above   

D. None of the above

A. Bray No. 1 extractant  

B. Bray No.2 extractant

C. Olsen extractant

D. None of these

A. Bray No. 1 extractant    

B. Olsen extractant

C. Bray No. 2 extractant     

D. None of these

A. Inceptisol

B. Vertisol 

C. Aridsol 

D. None of these 

A. CH₃COONH₄

B. NaHCO₃

C. CH₃COONa

D. NH₄HCO₃

A. Soil fertility evaluation

B. Plant analysis for assessing requirement of nutrients for crop production

C. Assessing crop damage   

D. Testing sitability of fertilizers

A. 5.5-6.5

B. 6.5-8.5

C. 3.5-5.5

D. 5.5-7.5