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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Q. Estimate the leaching requirement when electrical conductivity (EC) value of a saturated extract of soil is 10 m mho/cm at 25% reduction in the yield of the crop. The EC of irrigation water is 1.5 m mho/cm.

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Q. The higher the concentration of sodium present in the irrigation water, the lower is the risk.

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