Soil fertility is soil productivity, which refers to the ability of soil to produce plant products.

Soil radiation is the only source of soil heat.

The role of trees is to______. A: loose soil B: keep soil in position C: harden soil D: Both A and B

Soil age refers to the length of time for soil development. Soil age is usually divided into absolute age and relative age.

At the moment of applying load on saturated cohesive soil, who bears all the stress increase in the soil? A: Soil skeleton B: Pore water C: Both soil skeleton and pore water D: None of the above is true.

Which of the following compressions in the soil under loading cannot be ignored（） A: soil particles B: interparticle pore C: sealing gas D: water in the soil

The following statement is correct ().The steeper the curve, the smaller the compressibility of the soil; The greater the compression coefficient, the greater the compressibility of the soil;The greater the compression index, the greater the compressibility of the soil;The greater the compression modulus, the greater the compressibility of the soil A: × √ √ × B: √ × √ × C: √ × × √ D: √ √ √ ×

Ploughing mainly has the function of turning over soil, loosening soil and breaking soil.

‎Ploughing mainly has the function of turning over soil, loosening soil and breaking soil.‍

Soil bacteria are integral to healthy soil for plants to grow without the use of chemical fertilizers.