Related Questions

Sesbania aculeata can be used for soil reclamation of alkali soils.
Consider the following statements and choose the correct answer:
1. Average density of soil is 2.65 gms. per ml.
2. The spaces present between soil particles in a given volume of soil are called pore spaces
3. Porosity of the soil decreases with the increase in the percentage of organic matter in the soil
4. Macro-pore spaces have little water holding capacity and allow free movement of moisture and air in the soil under normal condition
Which of the following are the components of loamy soils?
I. Red soil
II. Clay soil
III. Alluvial soil
IV. Silt soil
V. Sandy soil
Which of the following substance can be used for soil reclamation?
Lime can be used for soil reclamation.
Adding FYM to the soil helps in reclamation.
Leaching is an important step in saline soil reclamation.
Adding Farm yard Manure or FYM to the soil helps in reclamation.
Water pipes are to be buried underground in a wet soil (thermal diffusivity = 2.78 * 10 -3 m2/s) which is initially at 4.5 degree Celsius. The soil surface temperature suddenly drops to -5 degree Celsius and remains at this value for 10 hours. Calculate the minimum depth at which the pipe be laid if the surrounding soil temperature is to remain above 0 degree Celsius. The soil may be considered as semi-infinite solid
Consider the following statements and choose the correct answer:
1. The process of soil formation is so slow that soil may be considered as a non-renewable resource
2. Soil pollution may be the direct effect of dumping and disposal of wastes, application of agrochemicals or the indirect result of air pollution
3. Pesticides increase the population and number of species of living organisms which facilitate the structure and fertility of the soil
4. Several pesticides or their degradations are absorbed by the plants