Tag: properties of natural resources

Fertility of the soil is not only decided by its ability to hold water or organic materials or its ability to retain nutrients but it is decided by all the factors combined and how well can it support life. If a soil has a huge thriving of plants, microorganism, etc with the availability of adequate resources then it is considered as very fertile soil.

Soil pH is important because it influences several soil factors affecting plant growth, such as (1) soil bacteria, (2) nutrient leaching, (3) nutrient availability, (4) toxic elements, and (5) soil structure. Bacterial activity that releases nitrogen from organic matter and certain fertilizers is particularly affected by soil pH, because bacteria operate best in the pH range of 5.5 to 7.0. Plant nutrients leach out of soils with a pH below 5.0 much more rapidly than from soils with values between 5.0 and 7.0. Plant nutrients are generally most available to plants in the pH range 5.5 to 6.5. Aluminum may become toxic to plant growth in certain soils with a pH below 5.0. The structure of the soil, especially of clay, is affected by pH. In the optimum pH range (5.5 to 7.0) clay soils are granular and are easily worked, whereas if the soil pH is either extremely acid or extremely alkaline, clays tend to become sticky and hard to cultivate

It is not true that soil $pH$ is in the range $6$ to $8$, the soil fertility is diminished

During soil testing, the soil is examined for colour, texture and the proportion of organic matter in it.

Fog is a thick cloud of tiny water droplets suspended in the atmosphere at or near the earth's surface which obscures or restricts visibility.

Air is a good conductor of heat.

Anemometer: Used to measure the speed of the wind.

The statement which is not true about air is that it has a chemical formula. Air has no chemical formula. It is a mixture of gases.