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Lecture on Drought by Harish Singh.pptx

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This document discusses drought, including its types and classifications and effects on plant physiology and morphology. It defines drought as a long period with no rain, especially during the planting season. Drought is classified based on duration, such as permanent, seasonal, contingent, or invisible drought. It is also classified based on relevance to users, such as meteorological, agricultural, hydrological, socioeconomic, or atmospheric drought. The key difference between drought and aridity is that drought is temporary while aridity is a permanent climatic feature.

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Drought Introduction Types / Classification & Effect on water Deficit on Physio Morphological Characteristics of the plant.
Introduction Drought :- The word drought generally denotes scarcity of water in a region. According to the American Heritage Dictionary (1976) defined drought as a long period with no rain especially during planting season. There is no universally accepted definition of drought. The two word Aridity & Drought both denote the condition of dryness or low moisture present in soil due to insufficient of water/ rainfall. According to Irrigation commission of India Drought is a situation occurring in any area where the annual rainfall is less than 75% of normal rainfall
Difference between Drought and Aridity Drought Aridity Temporary condition of scarcity of varying duration. Permanent feature Caused by deficient rainfall , considers all weather and seasonal features or condition Culmination of many long term processes considers all climatic features
Classification of Drought 1. Based on duration a). Permanent drought :- This is the characteristic of the desert climate. b). Seasonal drought :- Climate with well defined rainy and dry season. c). Contingent drought :- Abnormal failure of rainfall especially in most part of humid and sub humid climates. d). Invisible drought :- when rainfall is inadequate to meet the ET losses, usually in humid region.
2. Based on their relevance to the user (National Commission on Agriculture,1976) a). Meteorological drought :- Condition where the annual precipitation is less than the normal over an area for prolonged period (month, season or year) b). Agricultural drought :- Condition where the requirement of moisture to crop is not sufficient due to high ET. c). Hydrological drought :- meteorological drought, when prolonged results in hydrological drought with depletion of surface water & consequent drying of reservoirs, tanks etc. d). Socio economic drought e). Atmospheric drought.
Lecture on Drought by Harish Singh.pptx

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Lecture on Drought by Harish Singh.pptx

  • 1. Drought Introduction Types / Classification & Effect on water Deficit on Physio Morphological Characteristics of the plant.
  • 2. Introduction Drought :- The word drought generally denotes scarcity of water in a region. According to the American Heritage Dictionary (1976) defined drought as a long period with no rain especially during planting season. There is no universally accepted definition of drought. The two word Aridity & Drought both denote the condition of dryness or low moisture present in soil due to insufficient of water/ rainfall. According to Irrigation commission of India Drought is a situation occurring in any area where the annual rainfall is less than 75% of normal rainfall
  • 3. Difference between Drought and Aridity Drought Aridity Temporary condition of scarcity of varying duration. Permanent feature Caused by deficient rainfall , considers all weather and seasonal features or condition Culmination of many long term processes considers all climatic features
  • 4. Classification of Drought 1. Based on duration a). Permanent drought :- This is the characteristic of the desert climate. b). Seasonal drought :- Climate with well defined rainy and dry season. c). Contingent drought :- Abnormal failure of rainfall especially in most part of humid and sub humid climates. d). Invisible drought :- when rainfall is inadequate to meet the ET losses, usually in humid region.
  • 5. 2. Based on their relevance to the user (National Commission on Agriculture,1976) a). Meteorological drought :- Condition where the annual precipitation is less than the normal over an area for prolonged period (month, season or year) b). Agricultural drought :- Condition where the requirement of moisture to crop is not sufficient due to high ET. c). Hydrological drought :- meteorological drought, when prolonged results in hydrological drought with depletion of surface water & consequent drying of reservoirs, tanks etc. d). Socio economic drought e). Atmospheric drought.