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• The salts are to be leached below the root zone and not allowed to come up. However this practice is somewhat difficult in deep and fine textured soils containing more salts in the lower layers. Under these conditions, a provision of some kind of sub-surface drains becomes important. • Flooding and drainage are to be repeated 5 or 6 times, till the soluble salts are leached from the soil to a safer limit. • Intermittent flooding is more efficient than continuous ponding. • Scrape the salt layer on the surface of the soil with spade.
If the perimeter of rectangle is 54 cm and its length is 3 cm more than breadth then find its area?
A hollow spherical metallic ball has an external diameter 8cm and is 1/2cm thick. The volume of the ball (in cm cube) is.
A cylindrical tank has a radius of 7 meters and a height of 10 meters. How many liters of water can it hold? (1 cubic meter = 1,000 liters)
Find the area of the sector of a circle with radius 4cm and angle 30°.