Describe the relationship between soil water content and texture

What Is The Relationship Between Soil Texture And Water?

describe the relationship between soil water content and texture

What Is The Relationship Between Soil Texture And Water By this time, you can simply check the percentage of each layer to determine the soil type. The actual soil texture is determined using the Soil Textural Triangle e.g. for a Soil .. A good soil should have moisture contents between 5 and 60% What is the maximum drop in water table, that the palm trees in (a) can survive in silt soil. In the field, soil texture can be determined by rubbing the soil between the fingers (see It also depends on factors that vary, such as the soil moisture content.

Loamy soil has the tendency to compact when under heavy traffic. Fine-textured — soil with this texture is typically composed of clay. Since clay is very fine, this type of soil has a larger surface area and absorbs the most water.

Soil and Water Relationships

It has a high capacity to retain moisture and nutrients. However, the water is not easily accessible by the plant. Soil structure — this is the arrangement of soil particles, namely sand, silt and clay into a unit called aggregates.

The aggregates can be friable or loose, or they may form uniform patterns.


These can give the soil its overall structure. The porosity of the soil depends on its structure and texture. For instance, fine soil has small but numerous pores compared to coarse soil.

describe the relationship between soil water content and texture

Coarse soil has large pores but fewer pores. Additionally, small pores can hold water tighter. Water holding capacity — ability of the soil to hold water. This information is useful for crop selection and irrigation scheduling.

What is the Relationship Between Soil Texture and Water?

Depending on the soil texture, their water holding capacity in inches per foot of soil are as follows: Coarse sand — 0. Soil texture is important because it controls how well the soil can hold water and absorb it. The micropores affect the water holding capacity of the soil.

Imagine putting marbles on a table and pouring water over it. Now, imagine pouring water through a fine sponge. It will absorb and hold water until its pores are filled. In summary, the ability of the soil to absorb and retain water is hugely dependent on its texture. If the soil is coarse because of its large particle, there will not be enough surface area that can hold much water.

In fine textured clayey soils, drainage may take some days. At this stage, the soil is said to be at field capacity. At field capacity, the water and air contents of the soil are considered to be ideal for crop growth see Fig.

If no additional water is supplied to the soil, it gradually dries out. The dryer the soil becomes, the more tightly the remaining water is retained and the more difficult it is for the plant roots to extract it.

What Is The Relationship Between Soil Texture And Water?

At a certain stage, the uptake of water is not sufficient to meet the plant's needs. The plant looses freshness and wilts; the leaves change colour from green to yellow. Finally the plant dies. The soil water content at the stage where the plant dies, is called permanent wilting point. The soil still contains some water, but it is too difficult for the roots to suck it from the soil see Fig. Some soil moisture characteristics The soil can be compared to a water reservoir for the plants.

When the soil is saturated, the reservoir is full.

describe the relationship between soil water content and texture

However, some water drains rapidly below the rootzone before the plant can use it see Fig. Saturation When this water has drained away, the soil is at field capacity. The plant roots draw water from what remains in the reservoir see Fig. Field capacity When the soil reaches permanent wilting point, the remaining water is no longer available to the plant see Fig.

Permanent wilting point The amount of water actually available to the plant is the amount of water stored in the soil at field capacity minus the water that will remain in the soil at permanent wilting point. This is illustrated in Fig.