How many millimetres (equivalent depth) of water are
contained in a soil profile 1 metre deep if the mass water
content of the upper 400 mm depth is 15% and that of the
lower 600 mm is 20%. The bulk density in the upper layer is
1300 kg m- and in the lower layer is 1500 kg m-?. Assume Pw
= 1000 kg m’How much water does the soil contain (in
cubic
metres) per 1.5 hectares of land?
ri

Question

14-04-2022
Biology

contestada

How many millimetres (equivalent depth) of water are
contained in a soil profile 1 metre deep if the mass water
content of the upper 400 mm depth is 15% and that of the
lower 600 mm is 20%. The bulk density in the upper layer is
1300 kg m- and in the lower layer is 1500 kg m-?. Assume Pw
= 1000 kg m’How much water does the soil contain (in
cubic
metres) per 1.5 hectares of land?
ri

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mickymike92 mickymike92 · Answer 1 · 2022-04-25T15:01:47+02:00

The equivalent depth of water in the soil is 180 mm of water and the volumetric water content of soil is 3870 cubic meter/ 1.5 hectare of soil.

What is the formula to calculate the equivalent depth of water in a soil?

The equivalent depth of water in a soil is calculated using the formula below:

equivalent depth of water = water content × depth of soil

The depth of soil profile 1 = 400 mm

The depth of soil profile 2 = 600 mm

Equivalent depth of water in the soil = 15% × 400 mm + 20% × 600 mm

Equivalent depth of water in the soil = 60 mm + 120 mm = 180 mm

Therefore, the equivalent depth of water in the soil is 1800 mm of water.

The volumetric water content of the soil is calculated using the formula below:

Volumetric water content = water content × bulk density of soil/density of water × height of soil

Height of soil profile 1 = 0.4 m

Height of soil profile 2 = 0.6 m

Volumetric water content of soil profile 1 = 15% × 1300/1000 × 0.4 m = 0.078 cubic meter/square metre of soil

Volumetric water content of soil profile 2 = 20% × 1500/1000 × 0.6 m = 0.18 cubic meter/square metre of soil

Sum of volumetric water content of soil = 0.078 + 0.18 = 0.258 cubic meter/square metre of soil.

1 hectare = 10000 square metre

Thus, 1.5 hectares = 15000 square metre

Volumetric water content of soil = 0.258 × 15000 cubic meter/ 1.5 hectare of soil

Volumetric water content of soil = 3870 cubic meter/ 1.5 hectare of soil

Thus, the equivalent depth of water in the soil is 180 mm of water and the volumetric water content of soil is 3870 cubic meter/ 1.5 hectare of soil.

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