10 Questions
Which plant process requires water?
Transpiration
What is the annual rainfall range for the semi-arid climatic zone?
100-400 mm
Why is supplemental irrigation needed in humid and sub-humid regions?
To fulfill ET (evapotranspiration) due to solar radiation
In which climate zone does the tropical rain forest exist?
Humid
What is the primary function of water in plant processes?
To meet high ET due to solar radiation
Water is required for such plant processes as: Digestion Photosynthesis Transport of mineral Structural support Growth Transpiration
respiration
Climate and irrigation requirement: (A) Climate and crop- Temperature Frost Day length
moisture
Irrigation requirement Arid regions – Rainfall 200 to 250 mm – Irrigation Semi arid – Rainfall 400 to 500 mm Sub humid – Rainfall 600 to 700 mm – Rainfall > 800 mm Dry short spells Humid
dry
Table 1 MAJOR CLIMATIC ZONES Climatic Zone Annual Rainfall (mm) Wet ______ (months) less than 100 0-1 Little or no vegetation Arid 100-400 1-3 Some scrubs, some grassland Semi-arid 400-600 3-4 Scrubs & bushes, grassland Sub - humid 600-1200 4-6 Bushes to woodland, grassland Moist sub-humid 1200-1500 6-9 Forest and woodland more than 1500 9-12 Tropical rain forest Desert Humid Vegetation
period
Arid Region To meet high ET due to solar radiation Leaching requirement water additional to ET Competition for available water supplies
evapotranspiration
Test your knowledge about the concept of irrigation, including the process of applying controlled amounts of water to plants at needed intervals, replenishing soil water storage, and the role of photosynthesis in plant water uptake.
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