Soil Science Oneliner For Competitive Exam

Soil Science Oneliner

1. Feldspar, Quartz and Mica are example of which type of minerals – Primary minerals

2. Those fertilizers having all the three major nutrients viz., N, P and K. is know as – Complete fertilizers

3. Water soluble phosphatic fertilizers are – SSP, DSP, TSP and DAP

4. Which phosphatic fertilizer suitable for acid soil – Bone meal (23-30% P2O5)

5. The relative percentage of N2, P2O5 and K2O” in a fertilizer – Fertilizer ratio

6. The density of soil water is maximum at- 4°C

7. Commonly followed soil particle classified in India is – International Society of
Soil Science (ISSS)

8. According to IISS, the particle size of course sand- 2 – 0.2 mm

9. The particle size of fine sand is – 0.2 -0.02 mm

10. Fertilizers contain more than 25% of primary nutrients, e.g. – Urea (46%), DAP (18% N and 46% P2O5)- High analysis fertilizers

11.The surface tension of water is at 25°C –  72.7 dyne/cm2

12. The example of 2 : 1 type silicate clay minerals are – Montmorillonite , Vermiculite and Illite

13. The particle size of clay- < 0.002

14. The particle size of silt- 0.02 – 0.002

15. The hydroxide act as cementing agent in binding the soil particles together are-Fe and Al

16. Which mineral is a source of phosphorus and boron in soils – Appetite

17.E or A2’ horizon are also known as- Eluviation horizon

18. Least hygroscopic fertilizer is – DAP (18% N and 46%P2O5)

19. The most dominant mineral on earth crust is – Feldspar (48%)

20. The best agricultural soil structure is – Crumby/Spheroidal

21. Soil colour is determined by- Munsell Colour chart

22. Which horizon absent in arable land –  ‘O’ horizon

23. The process of decomposition of organic matter is termed as – Humification

24. A practice of turning un-decomposed fresh green plant tissue into the soil to improve fertility status and physical structure of the soil – Green Manuring

25. Groundnut cake contains NPK – 7 : 1.5 : 1.3

26. The range of usefulness of tensiometer is between – 0.0-0.8 bar

27. The capacity of the soil to produce plants under a specified programme of management and it is expressed in terms of yields – Soil Productivity

28. Which Soil structure proving less porosity in soil – Platy

29. Newly formed alluvial soil is called – Khadar

30. Phosphorus fixation is most probable in which soil – Laterite Soil

31. Widely accepted fixed value of particle density is – 2.65 g/cc

32. The maximum pore space are found in which soil – Clay soil

33. Deficiency symptoms of N, P, K, Mg and Mo appear in – Older leaves

34. Beneficial nutrients are – Ru, Sr, Ni, Cr and As

35. Immobile element in soil is –Phosphorus

36. Zn show deficiency symptoms in which leaves – Old and new leaves

37. Purple coloration appeared in leaves due to – P deficiency

38. Deficiency symptoms of Ca and B appear in – Terminal buds

39.. Immobile element in plant is- Calcium and Boron

40. New leaves show deficiency symptoms of which nutrient- Fe, Mn, Cu, S

41. Plant takes the nutrient in the form of – Ions

42. In waterlogged rice field, atmospheric nitrogen can be fixed to the soil by – BGA

43. Cereal crops show ‘V’ shaped pale yellowing at lower leaf tips due to deficiency of – N

44. Ca, Mg and S are – Secondary nutrients

45. N, P, K, Ca, Mg and S are – Macro nutrients

46. N, P and K are – Primary nutrients

47. Scorching and burning on margins of bottom leaves and irregular fruit development of plant are most common symptoms of – K deficiency

48. Burning quality of Tobacco decreased due to – Chloride

49. Concept “Essentiality of elements” was proposed in 1939 by – Arnon and Stout

50. Interveinal chlorosis occurs due to deficiency of – Mg and Fe

51. Symbiotic N2 fixing bacteria in leguminous crops – Rhizobium

52. Azotobacter can fixes atmospheric nitrogen/ha to the soil – 20-30 kg

53. Rhizobium trifolii is applied for – Berseem

54. Rhizobium leguminosarum is applied for – Pea, Lathyrus and Lentil

55. Asymbiotic N2 fixing bacteria – Azotobacter and Azospirillum

56. Failure of terminal bud and root tips is the principle symptom of – Ca deficiency

57. NPK content of town compost 1.4 : 1 : 1.4

58. NPK content of farm compost 0.5 : 0.15 : 0.5

59. A situation in which a crop needs more of a given nutrient yet has shown no deficiency symptoms – Hidden Hunger

60. Alkaline soil is also called as Solanetz and Black – alkali

61. The phosphate solubilizer species of micro organisms is – Pseudomonas

62. Downward cupping of leaves in Tobacco and Tea shows – S deficiency

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