Q. Tile drainage helps to reduce soil erosion.

View solution

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

View solution

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

View solution

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

View solution

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

View solution

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.

View solution

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

View solution

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?

View solution

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

View solution

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

View solution

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

View solution

Q. Alkali soils are reclaimed by ___________

View solution

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

View solution

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?

View solution

Q. Solonchak soil is the other name for ____________

View solution

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?

View solution

Q. What are the three classes of salty soil?

View solution

Q. What is Solonetz soil?

View solution

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.

View solution

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

View solution