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1. The benefits of using wastewater irrigation in
agriculture
Posted on February 5th, 2019
Water – our most precious natural resource – is
coming under threat and scientists warn that water
scarcity is going to face further pressure from the
growing effects of climate change. Tanks for
Everything stress the importance of recycling water
and explain how “there is simply not enough usable
water in the world and the pressure on groundwater
reserves is an issue across the globe.” It is therefore
important that we find ways to reuse and recycle the
water we have available, in order to secure water
supply for future generations.
Using wastewater irrigation in agriculture is one way to achieve this. Wastewater can be easily
collected or pumped directly from a nearby water source. It can then be used to irrigate crops and
fields. According to a report by ROWA more than 20 million hectares are currently being irrigated
with wastewater worldwide by about 200 million farmers. Below, we are going to look at what
irrigation is, and the main benefits of using wastewater irrigation in agriculture.
What is irrigation?
The Food and Agriculture Organisation define irrigation as “the artificial application of water to soil
for the purpose of supplying the moisture essential for plant growth.” Agriculture Victoria explain
how effective irrigation will influence the entire growth process from seedbed preparation,
germination, root growth, nutrient utilisation, plant growth, yield and quality. Irrigation is therefore
an extremely important process in agriculture across the globe. There are many different types of
irrigation systems available, this includes:
Flood irrigation – When water is applied over the entire field to infiltrate into the soil.
Sprinkler irrigation – When water is applied in the form of a spray so that it reaches the soil very
much like rain. The rate of application is adjusted to prevent it from creating a pond of water on the
surface.
Localised irrigation – When water is distributed under low pressure, through a piped network and
applied to each plant individually.
Drip irrigation – When drops of water are delivered at or near the root of plants. In this type of
irrigation, evaporation and runoff are minimised.
Centre pivot irrigation – When water is distributed by a system of sprinklers that move on wheeled
towers in a circular pattern.
Manual irrigation – When water is applied to plants manually using watering cans or buckets. This is
the most time-consuming and labour-intensive form of irrigation.
The type of irrigation system used will depend on a number of factors. These include, variations in
soil types, availability of water and power sources, the size of the area needing irrigation. In
addition, factors to consider include, the availability of financial resources, and how long the
irrigation system has been installed.

2. What are the benefits of using wastewater irrigation in
agriculture?
Using wastewater to irrigate crops and farmland has a number of benefits, this includes:
High nutrient content – Wastewater has a naturally high nutrient content which reduces or even
eliminates the need for expensive chemical fertilisers. This helps to support people in poorer
communities by reducing agricultural running costs.
Environmentally friendly – Using wastewater to irrigate crops and farmland is a sustainable practice
that helps to reduce water wastage and conserve water supply.
Higher production of crops – Irrigation allows farmers to grow more pastures and crops by
providing access to water. Particularly at times when it would otherwise be hard to achieve good plant
growth. Having access to water throughout the year also lengthens the growing season. In addition,
irrigation allows farmers to grow crops in areas that would otherwise be considered too dry. It
provides ‘insurance’ against seasonal variability and drought.
Better quality crops – Irrigation allows farmers to produce higher quality crops and pastures as
water stress can dramatically impact on the quality of farm produce.
Increase the value of the property – Irrigated land has the potential to support higher crops and
animal production. It is therefore more valuable. This means that having an irrigation system in place
often improves the value of the property.
Final thought
Our planet does not have infinite resources of water and it won’t last forever. It is therefore
essential that we recycle the water we have, in order to secure supply for future generations.
Wastewater and all of the other materials that go down the drain are a veritable treasure trove of
select raw materials. This resource can irrigate gardens and agricultural fields, or replenish surface
water and groundwater. Water recycling is an environmentally and economically viable solution to
help conserve our water resources.