WATER CYCLE


Water cycle:

cycle (Fig18.5 ) is defined as the continuous movement of water from the atmosphere to the earth and from the earth to the atmosphere.

The atmosphere receives water through

:
i. Rainfall or precipitation,
ii. Infiltration and percolation
Importance of water to crops
i. Water provides the medium for absorption of mineral salts.
ii. It facilitates the transfer of nutrients to other parts of plants where they are used in various metabolic processes
iii. Water is an essential raw material in the process of photosynthesis
iv. It is used for hydrolyzing food substances such as starch, proteins fats and oil for easy transmission to other parts of plants.
v. Water facilitates enzymatic activities occurring in crop plants
vi. It is a constituent of plan protoplasm
vii. The loss of water through transpiration is important for keeping the stomata open in gaseous exchange for respiration and photosynthesis
viii. It has a cooling effect on crops
ix. It helps to maintain plant tugor or turgidity
x. It helps to sustain life
xi. It helps in seed germinatin

Forms in which water exists in the soil

The form in which water exists in the soil include:
i. Hygroscopic water
ii. Capillary water




iii. Gravitational water
iv. These have already been explained in Chapter Eleven of this book

Ways of conserving water in the soil

i. Stoppage or reduction of surface water run – off
ii. Addition of human or organic manure
iii. Removal of weeds to reduce transpiration and water loss
iv. Mulching
v. Cover cropping
vi. Contour ridging
vii. Appropriate tillage
viii. Strip cropping

HERE YOU WILL FIND EVERY AVAILABLE TOPICS ABOUT AGRICULTURAL SCIENCE AND BIOLOGY. AND THE LINKS TO THEIR VARIOUS SOURCES.
1. DEVELOPMENT OF AGRICULTURE
2. IMPORTANCE OF AGRICULTURE
3. SUBSISTENCE AGRICULTURE
4. COMMERCIAL AGRICULTURE
5. PROBLEM OF AGRICULTURAL DEVELOPMENT
6. SOLUTIONS TO POOR AGRICULTURAL DEVELOPMENT
7. AGRICULTURAL LAWS AND REFORMS
8. ROLES OF GOVERNMENT IN AGRICULTURAL DEVELOPMENT
9. AGRICULTURAL POLICIES
10. PROGRAM PLANNING IN AGRICULTURE
34.
FORESTRY
35. WILDLIFE CONSERVATION
37. TOPOGRAPHY
38. SOIL
39. BIOLOGICAL FACTORS
42. CLIMATIC FACTORS AFFECTING AGRICULTURAL PRODUCTION
43. TEMPERATURE
44. RAINFALL
45. WIND
46. SUNLIGHT
47. SOLAR RADIATION
48. BIOTIC FACTOR AND AGRICULTURAL PRODUCTION
49. PESTS
50. BIRDS
51. DISEASES
52. SOIL MICRO-ORGANISMS
53. SOIL PH
54. ROCK FORMATION
55. IGNEOUS ROCK
56. SEDIMENTARY ROCKS
57. METAMORPHIC
58. SOIL AND ITS FORMATION
59. FACTORS OF SOIL FORMATION
60. LIVING ORGANISM
61. PARENT MATERIALS

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