Soil Science Multiple Choice Questions

At saturation capacity, the matric suction of soil is almost.

• 1 bar

• 31 bar

• 15 bar

• 0 bar

Relative proportion of sand, silt, and clay is

• Soil Structure

• Soil Texture

• Soil Moisture

• Porosity

Among the predominant soil groups of India, the large area is under.

• Laterite and Red Soil

• Red and Alluvial Soil

• Red and Black Soil

• Alluvial and Black Soil

Water movement in top soil profile and subsoil zone are respectively characterized as

• Infiltration and percolation

• Percolation and infiltration

• Infiltration and seepage

• Seepage and percolation

The equation which uses only temperature to estimate potential evapotranspiration is

• Blaney–Criddle equation

• Hargreaves equation

• Thornthwaite equation

• Penman formula

Water requirement of a crop is

• Irrigation Requirement (IR) + Effective Rainfall (ER) + Moisture contribution from soil profile (SM)

• IR – ER + SM

• IR + ER - SM

• IR – Application losses + SM

Amongst the four distinct growth stages of seasonal crops the maximum value of crop coefficient (Kc) is during

• Initial stage

• Crop development stage

• Mid-season stage

• Late season stage

Appropriate method for direct estimation of evapotranspiration is

• Lysimetric method

• Hargreaves equation

• Thornthwaite equation

• Penman formula

The evapotranspiration loss of 1 mm day-1 from one-hectare area in m3 day-1 is

• 5

• 10

• 15

• 20

Which one of the following is not a scientific method of irrigation scheduling?

• Soil indicators based

• Water balance based

• The neighbor’s field based

• Climatological data based