Agriculture Question and Answer for Competitive Exam

1. Soil pH is a measure of –>Soil acidity
2. Solonchack soil corresponds to –>Saline soil
3. Terai soils are deficient in –>Zinc
4. Crop most suitable for green manuring –>sunhemp
5. Best agricultural texture is found in –>Loamy soils
6. Father of soil testing –>M.L Troug
7. Element responsible for flocculation of soil –>Calcium
8. Clay particle size –><0.002mm
9. Kaolinite configuration is –>1:1type
10. Sesquioxides are oxides of –>Iron and aluminium
11. Natural soil aggregates are –>Peds
12. Particle size of 2mm to 7.5cm corresponds to –>Gravels
13. Purity of Gypsum –>Sulphur% Х 0.186
14. Cultivated soils have C:N ratio of –>10:1 to 12:1
15. Soil occurring highest in India –>alluvial soils
16. Partially decomposed organic matter –>Peat
17. Highly decomposed organic matter –>Muck soil
18. Father of pedology –>V V Dokuchaiv
19. Most widely occurring clay mineral –>Kaolinite
20. Ballast elements are –>Aluminium and Silica
21. Exchange of gases in soil takes placedue to –>diffusion
22. Most dominant mineral on earths crust –>feldspars ( recent 2015 – Bridgmanite )
23. Zero tillage was first introduced by –>USA
24. The metamorphic rock Quartz is derived from –>Sand stone
25. O horizon is found only in –>Forestsoils
26. Zone of maximum leaching–>A horizon
27. Zone of maximum accumulation –>B horizon / illuvial horizon
28. Zone of least weathering and dessication –>C horizon
29. Most suitable soil for crop cultivation –>Crumby soil
30. Analysis of sand , silt and clay content is done by –>Hydrometric method
31. Instrument used to measure Density of soil –>Pycnometer
32. For soil to exhibit plasticity –>minimum clay content of 15 %
33. Purity of color is given by –>Chroma
34. Soil color is given by –>Munsell color chart
35. ICAR has classified Indian soils into–>8 groups
36. Black cotton soil or –>Regur37. Limited expansion clay mineral –>vermiculate
38. Soil having no zonal differentiation–>Alluvial soil
39. Soil most suitable for plantation crops–>Laterite soils
40. Highest removal of soil particles take place by –>Sheet ersion41. For Nitrogen a C:N ratio <20:1 –>Mineralization
42. Fertilizer having all three primary major nutrients –>Complete fertilizer
43. Conversion of soil nitrate into gaseous nitrogen –>Denitrification
44. Rhizosphere is found –>around the root zone
45. Red color of red soil –>ferric oxide46. A and B horizions together are known as–>Solum
47. Maximumdensity of water –>4 degree Celsius
48. In paddy fertilizer should be placed at –>reduced zone
49. Secondary nutrients are–>calcium, Magnesium and sulphur
50. Puddling in paddy is done to–>reduce percolation of water in soil
51. Avalability of phosphorus is highest at pH of–>6.5 – 7.5
52. Availability of Zn and fe is highest under pH–><5.5
53. Alkali soil reclamation is done by –>Using Pyrites
54. Simplest method of determination of soil moisture –>Gravimetric method
55. Bulk density of soils is highest in –>Sandy soil
56. Essentality of N was given by –>De Sassure
57. Most prevalent form of soil erosion –>Saltation
58. Largest soil order in India –>Inceptisols
59. Gilgai microreliefs are characteristics of –>Black soils
60. Problematic soils in india occur an area of about –>10mHa
61. Problem soils are highest in –>Uttar Pradesh
62. Which clay increase water retention in soil –>2:1 type clays agrilearner
63. More organic matter content in soilsleads to –>Higher pore space and there by lower bulk density
64. Which condition is most suitable for soils –>Lower Bulk density
65. True density is also known as –>True density normal soils –>2.5gm/cm3
66. The equation S = f(Cl , O , R , P ,T) was given by –>Jenny which was a expandedequation of that given by Dokuchaeiv

67. Particles having size <0.001mm –>soil colloids ( colloidal property)
68. Free energy of water is expressed in terms of –>pF value
69. Soil saturated with water has a pF of –>0
70. Oven dry soil has a pF of –>7
71. Surface characteristic in which downward.

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