Soil science is the study of soils, their properties and how
they function in relation to plants. It is a field that combines many different
scientific disciplines, including microbiology, mineralogy, physics and
chemistry. This article will explore how soil science plays a role in
irrigation management for field crops such as wheat and legumes. Pedology is
the study of soils in their natural setting and has been equated with the study
of soil genesis and soil classification. The people who study soils in these
ways are pedologists.
Soil Science in Irrigation Perspective
Soil science is a science that deals with the study of soil.
Soil is a natural resource essential for all living things and for sustaining
human life. It is also an important component of our environment, as it
provides vital functions such as water storage and filtration, nutrient
cycling, climate regulation and erosion control.
Soil scientists work at the interface between agriculture, environmental
sciences and engineering to gain an understanding of how soil responds to
changes in climate or land use practices such as irrigation management
(Irrigation Management), tillage practices (Tillage Management) or surface
application methods such as dust suppression agents (Dust Control Agents).
Soil Scientific Knowledge
Soil scientific knowledge is a complex system consisting of
soil science, soil chemistry, soil physics and earth sciences. It deals with
the properties of soil and its components; the effect on them by human
activities; and how to maintain or restore this natural resource for
agricultural production. In addition to being a medium for plant growth, it
plays an important role in water management by providing an efficient medium which
allows roots access to nutrients needed for growth.
Soil can be classified according to its texture (consists of
aggregates), structure (consists of coarse sand particles), mineralogy
(consists mainly minerals) or paedology (consists of hydromorphic material).
Soil Physical character
Soil physical character is the physical characteristics of
soil. It includes soil type, texture and bulk density.
Soil type refers to whether the soil is sand, silt or clay;
and if it has high water content (high shrink-swell potential) or low water
content (low shrink-swell potential).
Texture describes how loamy (soft) or sandy a soil is in
terms of particle size distribution and structure. Bulk density refers to how
much material there is within each cubic metre (cm³) at a given depth below
ground level when compared with other similar materials such as gravels used
for construction purposes where bulk density lessens over time due to
compaction by heavy machinery moving through them as well as weathering
processes which can cause this material to break up into smaller pieces known
as fines which may not be recognized by any single person who looks at these
particles under microscope because they're so small compared with normal sized
rocks found elsewhere around us today!
Soil Chemical Character
Soil chemical characteristics are an important consideration
in evaluating the suitability of a given site for irrigation. Soil pH and
salinity, organic matter content and nutrient status can each be evaluated
individually or as part of a whole-site assessment.
Soil pH: The acidity or alkalinity (pH) of the soil is
determined by its mineralogy, which includes clay particles, silt or sand
components; it also depends on how much calcium carbonate (CaCO3) is present.
High levels of CaCO3 inhibit root growth due to their tendency to absorb water
instead of allowing it to leach through them into the lower layers where plants
grow roots.
Soil Biological Character
Soil biological activity is essential for soil fertility and
plant growth, nutrient cycling and water infiltration. Soil biological activity
can be defined as the sum of all soil micro-organisms, their activities or
metabolic processes; they are responsible for decomposing organic matter in
soils. They also kill pathogens that cause diseases on plants or animals.
Soil texture refers to how fine-grained (or coarse) a
material is based on its particle size distribution. Texture can be measured
using sieves ranging from 4 mm to 200 mm in diameter with larger sizes
indicating coarser textured materials while smaller ones signify finer textured
soils.
Principles of irrigation management
Before we begin, let's take a look at some of the most
important principles that underlie soil science and irrigation management.
- Irrigation
scheduling: Scheduling irrigation is one of the most important aspects of
effective irrigation management. The schedule should be planned so that
crops receive water as needed, but not too much at once or too little over
a period of time. This requires knowledge about how much water your crop
needs and when it will need it.
- Irrigation
efficiency: You may want your garden to grow faster than what nature
provides; however, this can lead to problems with excessive plant growth
(or "oversaturation"), which results in poor quality fruit or
vegetables due to rotting roots and nutritional deficiencies caused by
excess nutrients being stored underground instead of being used by plants
themselves through photosynthesis/photosynthetic processes
Irrigation water application management strategies for
field crops
Irrigation water application management strategies for field
crops
The irrigation water application management strategies for
field crops include:
- The
timing of the irrigation. As a rule, the crop should be irrigated when it
is 15% to 30% dry and then again when it is 10% to 20%. This helps avoid
any potential damage due to too much water at once.
- The
amount of water used per acre. A good rule-of-thumb is that one inch of
precipitation equals about one inch of water applied (roughly). For
example, if we have only two inches of precipitation in an entire year but
want our fields watered three times during those months, then at least
four inches would need to fall on them before we could apply enough
irrigation water so that all six inches were available for use by plants
(instead of just two).
The Nature of the soil is very important for crops that
use irrigation
The nature of the soil is very important for crops that use
irrigation. Soil is a mixture of minerals and organic matter with a structure
that can be classified in three ways:
- Structure
– This refers to how closely packed the particles are in your soil, which
affects how much water can be held by them.
- Texture
– Texture refers to how rough or smooth the surface of your soil is (it’s
not an absolute measurement). A smooth texture means no clods or pebbles
will stick in it while digging holes or tilling your garden plot; this
makes aeration easier. A rough texture means there will be more friction
between different sized particles during tillage operations such as
discing or mouldboard ploughing; this makes traction on equipment less
effective at turning over the topsoil layer when you turn over a furrowed
field bedding pattern where rows are spaced far apart from each other
In conclusion, soil science is an essential part of
irrigation management. Irrigation water application strategies for field crops
should be based on the nature of the soil and knowledge about its physical
character (texture, structure), chemical character (nutrient availability and
composition) and biological character (microorganisms).
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