21. Which science assumes the status of petrology, petrography and pedogenesis
22. The soil organisms are most active at . . . . . . . . temperature.
23. Hydromorphic soils are evolved by which process
24. What is the porosity percentage if the particle density of soil is 2.6 and bulk density is 1.3
25. In plants, the common symptom caused by the deficiency of K, P, Ca, and Mg is the
26. Apatite is a group of minerals which mainly contains
27. Which of the following is nitrogenous fertiliser for amide group?
28. Ethanol soluble fraction of Humic acid is
29. Microbial Biomass generally constitute . . . . . . . . % of total soil mass.
30. Central soil salinity research institute is located at
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