Azotobacter fixes atmospheric nitrogen in the soil by:__________?

Related Mcqs:

1. Nitrogen & sulphur dioxide liberate from motor vehicles & industries. Nitrogen & Sulphur gases dissolve in the water vapour of atmosphere & form nitric & sulphuric acid. This rain water falls on soil as__________ & contaminates soil also:

   A. Acid rain B. Neutral rain C. Both A & B D. None of the above Submitted by: Shafiq Rehman...

2. Any material such as straw, sawdust, leaves, plastic films, & loose soil that is spread upon the surface of the soil to protect the soil & plant roots from the effects of raindrops, soil crusting, freezing or evaporation:

   A. Mull B. Mulch C. Mycorrhizae D. Muck Submitted by: Shafiq Rehman...

3. Soil additive which stabilizes the soil, improves resistance to erosion, increases to permeability to air & water, improves texture, eases cultivation or otherwise improves soil quality:

   A. Soil amendment B. Soil conditioner C. Both a & b D. None of the above Submitted by: Shafiq Rehman...

4. Flow of nitrogen in soil due to:_________?

   A. Diffusion B. Interception C. Mass flow D. None of the above Submitted by: Shafiq Rehman...

5. Preferable form of nitrogen for rice under submerged soil conditions is ____________?

   A. NH4 B. NO3 C. NO2 D. All of these Submitted by: Muhammad Rehan...

6. Soil erosion is __________ of soil from one place ti another place by natural agencies (wind & water):

   A. Detachement of soil B. Transportation C. both A & B D. None of these Submitted by: Shafiq Rehman...

7. A soil is classified as sodic soil when______________________?

   A. EC is 8.5 C. SAR is >13 D. All the above...

8. Addition of sodium hexametaphosphate in soil for determination of soil texture causes__________________?

   A. Agregation of soil particles B. Cementing of soil particles C. Dispersion of soil particles D. All the above...

9. Organic P content in soil, by ignition method is estimated by igniting the soil at ____________________?

   A. 250ºC B. 1000ºC C. 550ºC D. 1250ºC...

10. The major soil fertility problems in Pakistani soils deficiencies of N, P and Zn. Deficiencies K, Fe, and B also occur in specific crop genotypes or soil types, while deficiencies of S, Cu, and Mn are negligible. however, the common nutrient deficiencies are_________________: and some micronutrients including Mo?

    A. N, P, K B. Ca, Mg, S C. both A & B D. The above statement is wrong Submitted by: Shafiq Rehman...