Tag: soil : our life

• Lime is a valuable soil amendment that helps plants and lawns flourish by raising soil pH.
• Most vegetables grow best in a slightly acidic to neutral soil, with a pH between 6.0 and 7.0 hence acidic soils having low pH is added with lime for raising its pH.
  
• Hence Lime is added to soil which is acidic.
• So, the correct answer is 'Lime'.

Soil salinity in arid regions is primarily caused by the accumulation of soluble salts near the surface due to high evaporation rates exceeding precipitation. This prevents salts from being leached away.

Petroleum products are used as transportation fuels, fuel oils, for generation of electricity, road oils etc. major use of  petroleum is in transport.

Pedology refers to study of soil in their natural environment. Demography refers to study of human population. Paleontology refers to the study of fossils. Hydrology refers to the study of water.

• When a plant's soil pH increases the plant's ability to absorb certain nutrients is disrupted.
• A pH of 6.0 to 7.0 (slightly acidic to neutral) range is most suitable for the best growth of plants. 
  
• A most economical and effective method to control the pH of the soil is the addition of $CaCO _3$ because it increases the pH level of acidic soil, thus reducing the acidity and increasing the alkalinity of the soil.
  
• Hence the most economical and effective method to control the pH of the soil is $CaCO _3$.
• So, the correct answer is '$CaCO _3$'.

• The water holding capacity of a soil is a very important agronomical  characteristic. 
• small particles have a much larger surface area than the larger sand particles.
  
• large surface area of particle allows the soil to hold a greater quantity of water. so , option A is correct.
  

Edaphic factor is an abiotic factor relating to the physical or chemical composition of the soil found in a particular area. For example, very alkaline soil may be an edaphic factor limiting the variety of plants growing in a region.

Azotobacter is a well-known free-living nitrogen-fixing bacterium found in soil. Rhizobium is also a nitrogen fixer, but it is symbiotic (living in root nodules), while Nitrobacter is involved in nitrification, not nitrogen fixation.

Oxalophytes are the plants that grow in acidic soil that maintained at pH 5.5 as this enables the plant to absorb nutrients required for the growth.

A good soil is that which allows the water to percolate slowly into groundwater. These soils can remove pollutants and they promote the growth of healthy vegetation, which in turn reduces soil erosion.