51. Match the following columns:
Column I (Fertilisers)
Column II (N- content %)
a. Sodium nitrate
1. 13
b. Calcium nitrate
2. 16
c. Potassium nitrate
3. 15
d. Urea
4. 46
| Column I (Fertilisers) | Column II (N- content %) |
| a. Sodium nitrate | 1. 13 |
| b. Calcium nitrate | 2. 16 |
| c. Potassium nitrate | 3. 15 |
| d. Urea | 4. 46 |
52. Who isolated Bacillus radicicola, the organism responsible for N fixation in 1888
53. The Law of Restitution was propounded by
54. Relative purity or strength of the spectral color of soil is
55. Equivalent acidity of urea in
56. India depends completely on imports for its need of
57. Richest source of nitrogen is
58. The granite is
59. When P > PET, it is said to be
60. Sulphur soil testing is determined by using
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