Q. For maximum productivity of crops both surface and sub-surface drains are sometimes needed.

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Q. How can tile drainage help to increase crop yields?

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Q. Tile drainage helps to reduce soil erosion.

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Q. Which type of soils is benefited by using tile drainage?

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Q. In what chemical ways does tile drainage help in plant growth?

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Q. Under what strata the tile drainage should not be placed?

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Q. What structure is surrounded around the tile drains when used in less pervious strata?

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Q. What is the size of the tile at an outlet of a 12 hectare drainage system, if the D.C is 2 cm and the tile grade is 0.5%. Assume the rugosity coefficient as 0.015 for the tile drain material.

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Q. Which type of alternate layouts system for tile drainage has two mains?

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Q. How many cubic metres of water will be removed for this particular period of a system designed to use a D.C of 1.5 cm draining 20 hectares for a capacity of 5 days?

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Q. Which among the following salt is also called black alkali?

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Q. Which is the least harmful salt for agricultural soil?

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Q. The plant roots act as a semi-permeable membrane.

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Q. Alkali soils are reclaimed by ___________

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Q. If the salt concentration of the irrigation water ranges from 0.5 – 2 g/L, then what is the restriction on its use?

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Q. If the salt concentration of the soil water (saturation extract) in milli-mhos/cm is in between 4.5 – 9, then what is the salinity of the soil?

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Q. Solonchak soil is the other name for ____________

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Q. A soil sample has an Exchangeable sodium percentage (ESP) of 16%, its electrical conductivity is 3.2 Milli-Mohs/cm and a pH of 9.5. How is the soil classified?

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Q. What are the three classes of salty soil?

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Q. What is Solonetz soil?

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