Written by Ir. Sri Najiyati & Ir. Danarti, human efforts to
fulfill and regulate the need for plants for water, which is often
called irrigation, have developed since ancient times. Although
at that time the methods and tools used were still traditional and
makeshift. At present the business has increased with technology.
Various characteristics of plants in relation to water have been
studied and sophisticated and modern mechanization tools have
also been found, so that irrigation can be carried out appropriately
both time and method as well as the amount of water requirements
without requiring much labor. The description in this book begins
with a description of the properties of water in nature and in
relation to plants and the characteristics of each type of plant for
water needs. Also contains instructions on ways to provide water
for plants both traditional and modern, because according to
the authors traditional methods are still relevant while modern
methods are feasible to be implemented in Indonesia. Water is one
of the factors that is very important for plant life. It is not surprising
that its existence is very influential on the types of plants that live
somewhere. In areas that have high rainfall, we will find plants that
need a lot of water, while in areas with low rainfall we will find
plants that are resistant to drought.
The role of water for plant life is water as a nutrient solvent
in the soil so that plants can easily take the nutrient through the
roots as food and at the same time transport the hope to parts of
plants that need it. Water is one of the important components in
photosynthesis, namely the process of forming carbohydrates from
water and carbon dioxide with the help of sunlight. Almost all plant
physiology processes including chemical reactions take place in the
presence of water. Inside the water plant functions to maintain the
firmness of the plant. If the plant lacks water, the plant will wither
and then die. Water as a temperature controller in plants when the
sun is hot. When the sun is hot, leaves and other parts of the plant
will overheat so that the temperature can rise continuously if there
is no one to control it, namely water. Water controls the temperature
of the plant by evaporation through the stoma on the leaf surface.
Because evaporation requires heat, so the temperature of the plant
that was too high became constant again. The benefits of water
for plants are very large and their presence around the plants is
an absolute requirement for plants to take the water for their lives.
But its existence can also be a disaster if the amount is excessive.
All plants need water, but their needs vary depending on the type.
Rice, for example, requires a lot of water almost during its growth
period. Instead the cactus will languish if it lives in an environment
that contains lots of water. On this earth there are approximately
1.3-1.4 billion cubic km of water. But this large amount is not all
around the plants we cultivate but most of them are in the sea, in
rivers, in lakes, in swamps, in the air as clouds or as groundwater
that is not accessible to the roots of plants. For plants to meet their
water needs, cultivating human intervention is very necessary.
Human intervention to meet the needs of plants for water is called
irrigation. According to the method of administration the irrigation
system is divided into three, namely watering systems, aboveground
irrigation and subsurface irrigation. Watering is a system
of giving water by spraying so that the fall of water to the surface
of the soil / plant will be in the form of granules that resemble rain.
While irrigation is a system of giving water by flowing and flooding
above the soil surface or from below the soil surface. In the past,
when humans were not familiar with advanced technology, the new
irrigation system was carried out simply with a makeshift tool. The
water channels that are made are generally not permanent and
are easily damaged so that plants that require a lot of water such
as rice can generally only be planted in the rainy season or once a
year. Irrigation like this is known as non-technical irrigation. At this
time when humans have known advanced technology, irrigation
and watering systems have evolved along with technological
developments.