31. For consideration of Argillic endopedon, how many times of clay content need to have than overlying horizon?
32. Size of colloidal clay particle is less than
33. In Ammonium Nitrate % of Ammonium and Nitate are
34. Sulpher, Rock phosphate & Thiobacillus combined to form
35. No. of benchmark soil in India is
36. Useful practice to manage acid sulphate soil is
37. Plant analysis is useful if done at
38. Humus forming fungi includes which genera
39. In Oxisol which type of Clay is found
40. If quartz & feldspar are predominantly observed in sandstone, then it is called
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