Understanding the Process of Irrigating

Irrigating is a crucial process that helps plants grow and thrive. It's a simple yet essential concept that involves supplying plants with the right amount of water at the right time.

To irrigate effectively, you need to understand the water requirements of the plants in your care. This includes knowing the type of plant, its growth stage, and the climate it's exposed to.

The frequency of irrigation depends on the soil type and its water-holding capacity. Sandy soils, for example, tend to dry out quickly and require more frequent watering.

A general rule of thumb is to water plants when the top 2-3 inches of soil feel dry to the touch. This ensures that the roots receive the water they need without overwatering the plant.

Take a look at this: Irrigating Plants

Irrigation is a system that supplies water to land or crops by artificial means, typically using a network of pipes and sprinklers.

This method can be crucial for crops that require a lot of water, such as rice and sugarcane, which can lose up to 90% of their water through evaporation and transpiration.

Irrigation can be done using various methods, including drip irrigation, which delivers water directly to the roots of the plants, reducing water waste and increasing crop yields.

Additional reading: Automated Irrigation System Using Soil Moisture Sensor

The Latin "irrigare" is a combination of two words: "in" and "rigare." "In" means "into, in, on, upon", while "rigare" means "to water, to moisten." The exact origin of "rigare" is uncertain, but it might be related to the PIE root *reg- (2) "moist" or the root of regere "to direct, lead."

The word "irrigate" has been used in English since the 1610s to describe the act of supplying land with water. This is the sense that makes the most sense, but it has phonetic problems.

Irrigation is the process of supplying water to land or crops to support plant growth.

It's essential for agriculture, allowing crops to be grown in areas with limited rainfall.

Irrigation can be used to support a wide range of crops, from fruits and vegetables to grains and nuts.

Agricultural irrigation systems can be designed to conserve water and reduce waste.

In some areas, irrigation is necessary to support crops that would otherwise not be able to grow due to drought or dry conditions.

Irrigation can also be used for non-agricultural purposes, such as maintaining golf courses or parks.

Surface irrigation is the oldest form of irrigation, used for thousands of years. It involves water moving across the surface of agricultural lands to infiltrate into the soil, often resulting in flooding or near flooding of the cultivated land.

Surface irrigation can be subdivided into furrow, border strip, or basin irrigation. Historically, it's the most common method of irrigating agricultural land across most parts of the world.

Surface irrigation has a lower water application efficiency compared to other forms, but it requires significantly lower capital costs and energy compared to pressurized irrigation systems.

There are several methods of irrigation, each with its own unique characteristics and benefits. The choice of method depends on the type of crop being grown, the climate, and the available resources.

Sprinkler irrigation is a common method that uses a network of pipes and sprinklers to distribute water evenly over the land. It's particularly effective for large areas of grass and crops.

Drip irrigation, on the other hand, delivers water directly to the roots of plants, reducing evaporation and runoff. This method is often used in areas with limited water resources.

Center pivot irrigation uses a rotating sprinkler system to water crops in a circular pattern. It's commonly used for large fields of corn and soybeans.

Micro-sprinkler irrigation is similar to drip irrigation but uses smaller sprinklers to water smaller areas. It's often used in greenhouses and small gardens.

Surface irrigation is the oldest form of irrigation and has been in use for thousands of years.

It's often called flood irrigation when the irrigation results in flooding or near flooding of the cultivated land. Surface irrigation can be subdivided into furrow, border strip or basin irrigation.

The water application efficiency of surface irrigation is typically lower than other forms of irrigation. This is due in part to the lack of control of applied depths.

Surface irrigation involves a significantly lower capital cost and energy requirement than pressurized irrigation systems. It's often the irrigation choice for developing nations, for low-value crops and for large fields.

In some cases, the water is pumped or lifted by human or animal power to the level of the land. This method is used to water urban gardens in certain areas, such as in and around Phoenix, Arizona.

The irrigated area is surrounded by a berm and the water is delivered according to a schedule set by a local irrigation district.

Micro-irrigation is a system where water is distributed under low pressure through a piped network. It's a precise way to water plants, making every drop count.

This type of irrigation is also known as localized irrigation or low volume irrigation. It's a more efficient method compared to traditional sprinkler systems.

Micro-irrigation can be achieved through various methods, including drip irrigation, subsurface drip irrigation, micro-spray, or micro-sprinklers. Each method has its own unique benefits and applications.

Some common types of micro-irrigation systems include traditional drip irrigation, which uses individual emitters, and subsurface drip irrigation, which delivers water directly to the roots of plants.

Broaden your view: Solar Garden Irrigation Systems

Water sources play a crucial role in irrigation. There are several methods of irrigation, and they vary in how the water is supplied to the plants.

The goal of irrigation is to apply the water to the plants as uniformly as possible, so that each plant has the amount of water it needs, neither too much nor too little. This can be achieved through various methods, such as bringing in water from pipes, canals, sprinklers, or other man-made means.

Places that have sparse or seasonal rainfall could not sustain agriculture without irrigation. In areas with irregular precipitation, irrigation improves crop growth and quality.

Ancient civilizations in many parts of the world practiced irrigation. In fact, civilization would probably not be possible without some form of irrigation.

Modern irrigation systems use reservoirs, tanks, and wells to supply water for crops. These reservoirs can include aquifers, basins that collect snowmelt, lakes, and basins created by dams.

Crops are irrigated by several methods, including flooding an entire field, channeling water between rows of plants, spraying water through large sprinklers, or letting water drop onto plants through holes in pipes.

For more insights, see: Irrigating Potted Plants

Irrigation systems are a crucial part of maintaining healthy plants and crops. Most lawn sprinkler systems are operated automatically using an irrigation controller, sometimes called a clock or timer, which sends power to electric solenoid valves that open and close to control water flow.

There are two main types of sprinklers used in lawn irrigation: pop-up spray heads and rotors. Spray heads have a fixed spray pattern, while rotors have one or more streams that rotate. A typical lawn sprinkler system will consist of one or more zones, limited in size by the capacity of the water source.

A solid-set irrigation system uses sprinklers, sprays, or guns mounted overhead on permanently installed risers, and is often referred to as a solid-set irrigation system. Higher pressure sprinklers that rotate are called rotors and are driven by a ball drive, gear drive, or impact mechanism.

Sprinkler irrigation systems can be expensive, with a typical quarter-section center pivot irrigation system costing around $105,000 to $115,000 for a new system, including a check valve, flow meter, shutoff valve, pressure gage and fittings.

Here's a breakdown of the approximate capital costs of a typical quarter-section center pivot irrigation system on a per acre basis:

Total capital investment per acre = $200,000/128 acres = $1,563.

Drip irrigation is a water-efficient method that delivers water directly to the root zone of plants, one drop at a time. This approach minimizes evaporation and runoff, making it an ideal choice for farmers and gardeners.

Drip irrigation systems can be high-tech and computerized or low-tech and labor-intensive, depending on the design. Lower water pressures are needed compared to other types of irrigation systems.

The field water efficiency of drip irrigation is typically between 80 to 90% when managed correctly. This means that most of the water delivered is actually absorbed by the plants.

Drip irrigation can be combined with plastic mulch to further reduce evaporation. This is a common practice in modern agriculture.

If a drip system is operated for too long or if the delivery rate is too high, deep percolation can occur. This is when water moves below the root zone, wasting valuable resources.

Drip irrigation can be designed for uniform water delivery throughout a field or for precise water delivery to individual plants in a mixed landscape. This flexibility makes it a popular choice for gardeners and farmers.

Pressure compensating emitters are available to regulate pressure on steep slopes, making drip irrigation a viable option for uneven terrain.

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Lawn sprinkler systems are permanently installed and consist of one or more zones, each covering a designated portion of the landscape.

Most lawn sprinkler systems are operated automatically using an irrigation controller, also known as a clock or timer, which sends power to electric solenoid valves to open and close them.

A typical lawn sprinkler system will include pop-up spray heads and rotors, with spray heads used for smaller areas and rotors for larger areas.

Spray heads have a fixed spray pattern, while rotors have one or more streams that rotate.

Drip irrigation systems deliver water at or near the root zone of plants, one drop at a time, making them a water-efficient method of irrigation.

Drip irrigation can be combined with plastic mulch to further reduce evaporation and is also used for delivering fertilizer, a process known as fertigation.

Center pivot irrigation systems use several segments of pipe joined and supported by trusses, mounted on wheeled towers with sprinklers positioned along its length.

Expand your knowledge: Irrigating Trees with Drip Systems

These systems move in a circular pattern and are fed with water from the pivot point at the center of the arc.

Wheel line systems, also known as lateral move systems, are a type of irrigation system that consists of a series of pipes with sprinklers along its length.

They are less expensive to install than center pivot systems but require more labor to operate.

Subirrigation involves artificially raising the water table to allow the soil to be moistened from below the plants' root zone.

It is often used in field crops in areas with high water tables and can be combined with drainage infrastructure.

Equipment for irrigation systems should be selected based on water supply, irrigated acreage, crop rotations, labor requirements, and power supply.

A well-established dealer with a good service record should be chosen to ensure timely repair in case of emergencies.

Electricity is generally the preferred power source for irrigation pumps, but it may not always be available or feasible. Construction costs and repayment for extending power lines vary with each electrical provider.

If existing power lines are more than a mile from the pump site, an internal combustion engine might be more economical. This is because electricity has several advantages, including lower pumping costs, less maintenance, reliability, and ease of operation.

Three-phase power is preferred for electric pumps, but it's often not available or too expensive to bring to the pump site.

Irrigation schemes can be complex, and engineers often face numerous challenges when designing and implementing them. Ground subsidence is a significant issue, as seen in New Orleans, Louisiana.

Poor soil salinity control can lead to increased soil salinity, resulting in toxic salts building up on the soil surface in areas with high evaporation. This is especially true in drip line irrigation systems, where underirrigation can cause salt buildup.

Overirrigation is another major problem, wasting water, chemicals, and potentially leading to water pollution. It can also cause deep drainage, which may result in rising water tables and irrigation salinity issues.

Discover more: Irrigation Sensors for Soil Moisture

In Australia, over-abstraction of fresh water for intensive irrigation activities has caused 33% of the land area to be at risk of salination. This highlights the importance of proper water management.

Drainage front instability, or viscous fingering, can occur when an unstable drainage front results in a pattern of fingers and viscous entrapped saturated zones.

Irrigation with saline or high-sodium water can damage soil structure, leading to the formation of alkaline soil. This can be detrimental to plant growth.

Clogging of filters can be a significant issue, especially when algae grow and clog filters, drip installations, and nozzles. Chlorination, algaecide, UV, and ultrasonic methods can be used to control algae in irrigation systems.

Measuring irrigation performance accurately can be complicated, as it changes over time and space. This makes it difficult to evaluate productivity, efficiency, equity, and adequacy.

Macro-irrigation, commonly used in intensive agriculture, can cause eutrophication when combined with the use of agrochemicals. This can have serious environmental consequences.

Intriguing read: When to Stop Irrigating Corn

Efficiency is key when it comes to irrigation. Modern irrigation methods are efficient enough to supply the entire field uniformly with water, so that each plant has the amount of water it needs, neither too much nor too little.

Field Water Efficiency can be determined as follows: Field Water Efficiency (%) = (Water Transpired by Crop ÷ Water Applied to Field) x 100

Increasing irrigation efficiency has a number of positive outcomes, including reducing water and energy costs per unit of agricultural production. Low application efficiency can lead to excess water being lost through seepage or runoff, both of which can result in loss of crop nutrients or pesticides with potential adverse impacts on the surrounding environment.

For another approach, see: Crop Steering Irrigation Schedule

Efficiency plays a crucial role in irrigation, allowing farmers to supply the right amount of water to each plant without wasting a drop. This is achieved through modern irrigation methods that are efficient enough to supply the entire field uniformly.

Water use efficiency in the field can be determined by the formula: Field Water Efficiency (%) = (Water Transpired by Crop ÷ Water Applied to Field) x 100. This simple calculation helps farmers gauge how efficiently they're using water.

Increased irrigation efficiency has numerous positive outcomes for farmers, communities, and the environment. For instance, low application efficiency means the amount of water applied is in excess of the crop or field requirements, resulting in wasted water and potential financial costs for farmers who are charged for irrigation water.

A key benefit of improved irrigation efficiency is higher yields in the same area of land, achieved by applying less water or using it more wisely. This can also lead to a reduction in water and energy costs per unit of agricultural production.

Reducing water use on one field can allow farmers to irrigate a larger area of land, increasing total agricultural production. However, low efficiency often results in excess water being lost through seepage or runoff, which can have adverse impacts on the surrounding environment.

Improving irrigation efficiency is typically achieved through one of two methods: optimizing system design or optimizing irrigation management. This can involve converting from one form of irrigation to another, such as from furrow to drip irrigation, or making small changes to the current system, like adjusting flow rates and operating pressures.

By optimizing irrigation management, farmers can schedule irrigation events and make informed decisions about how much water to apply. This can help minimize waste and maximize crop yields, ultimately benefiting both the farmer and the environment.

For another approach, see: Circular Crop Irrigation

Irrigation can have devastating environmental impacts, especially when it's done on a large scale. Negative impacts frequently accompany extensive irrigation, leading to a more extreme regional climate.

Drying up water sources can have severe consequences, as seen in projects that diverted surface water for irrigation. This can cause subsidence and salinization, which can damage crops and seep into drinking water.

Pests and pathogens thrive in irrigation canals or ponds full of still water, creating regional outbreaks of diseases like malaria and schistosomiasis. This is a serious concern for public health.

Overdrafting of underground aquifers is a major issue, with the advent of diesel and electric motors leading to systems that can pump groundwater out faster than drainage basins can refill them. This can lead to permanent loss of aquifer capacity and decreased water quality.

Ground subsidence is another problem caused by over-pumping of groundwater, which can have long-term effects on the environment and food production. The future of food production in areas like the North China Plain and the Great Plains of the US is threatened by this phenomenon.

The ancient civilizations of Sri Lanka and China were pioneers in irrigation engineering. They developed complex systems to store and distribute water, which were crucial for agriculture.

The Sinhalese in Sri Lanka built artificial reservoirs and canal systems around 300 BCE, which were used primarily to irrigate paddy fields. These systems still exist undamaged today in Anuradhapura and Polonnaruwa.

In China, the Dujiangyan Irrigation System, devised by Li Bing in 256 BCE, is still supplying water to a vast area of farmland. This ancient system is a testament to the ingenuity of the ancient Chinese engineers.

The Chinese also used chain pumps to lift water from a lower elevation to a higher one, powered by manual foot-pedal, hydraulic waterwheels, or rotating mechanical wheels pulled by oxen.

The history of irrigation is a fascinating topic that spans thousands of years and multiple continents. Let's take a look at some of the earliest known irrigation systems.

In ancient China, hydraulic engineers like Sunshu Ao and Ximen Bao worked on large irrigation projects as far back as the 6th century BCE. These systems were used to irrigate farmland and provide water for urban residential quarters.

The Dujiangyan Irrigation System in Sichuan, China, is a remarkable example of ancient engineering. Built in 256 BCE, it still supplies water to a vast area of farmland today.

In Sri Lanka, the irrigation works of ancient Sri Lanka were one of the most complex systems of the ancient world. The Sinhalese built artificial reservoirs to store water and irrigate paddy fields.

The oldest known irrigation canals in the Americas were found in the Zaña Valley in northern Peru, dating back to at least 3400 BCE. These canals irrigated crops like peanuts and squash.

Here's a brief overview of some of the earliest known irrigation systems:

In Africa, different irrigation schemes were implemented in the 20th century, often influenced by colonial forces. The Tana River Irrigation Scheme in Kenya, completed between 1948 and 1963, opened up new lands for agriculture.

The Great Man-Made River in Libya, built in 1969, delivered Saharan water to the coast and largely contributed to irrigation. However, it cost four to ten times more than the crops it produced were worth.

The American West is a vast and fascinating region that spans across the western part of the United States. It's a land of rugged beauty, with its towering mountain ranges, vast deserts, and sprawling cities.

The region's geography is characterized by the Rocky Mountains, which stretch from British Columbia, Canada, to New Mexico. This mountain range is home to some of the highest peaks in the country, including Mount Elbert in Colorado.

The American West is also home to the Grand Canyon, one of the most iconic natural wonders in the United States. This massive canyon is over a mile deep and 277 miles long.

The region's climate varies greatly, ranging from the cold, snowy winters of the mountainous regions to the hot, dry deserts of Arizona and Nevada. In fact, Death Valley in California holds the record for the highest recorded temperature on Earth.

The American West has a rich history, with many Native American tribes having called the region home for thousands of years. The region was also a major hub for the California Gold Rush of the mid-19th century, which drew thousands of prospectors to the area.

The Transcontinental Railroad, completed in 1869, connected the East and West coasts of the United States, revolutionizing transportation and commerce in the region. This railroad played a significant role in the development of the American West.

If this caught your attention, see: Drip Irrigation Kit for Home Garden

Soviet Central Asia was a region that underwent significant changes in the early 20th century. The Bolsheviks conquered Central Asia in 1917, bringing with them their own irrigation methods.

The native Kazakhs, Uzbeks, and Turkmens used minimal irrigation, but the Slavic immigrants introduced waterwheels, rice paddies, and underground irrigation channels. Russians dismissed these techniques as crude and inefficient.

The Russian government accepted a 1911 American proposal to send hydraulic experts to Central Asia to investigate the potential for large-scale irrigation. This led to the development of large-scale irrigation projects in the 1930s.

Stalin and other Soviet leaders prioritized ambitious hydraulic projects, especially along the Volga River. Their goal was to achieve cotton self-sufficiency, driven by fears of the American cotton monopoly.

The Russians built dams on the Don and Kuban Rivers for irrigation, but this had unintended consequences, such as removing freshwater flow from the Sea of Azov and making it much saltier.

Here's a list of some of the major irrigation projects in Soviet Central Asia:

By 1975, the USSR was using eight times as much water as they had in 1913, mostly for irrigation.

To make irrigation a financially viable option, it's essential to explore financing options. Contact irrigation dealers, other irrigators in the area, banks, and other farm financial organizations to get a better understanding of the costs involved.

A good example of a financing program is the Ag Pace irrigation financing program through the Bank of North Dakota, which can be found online at https://bnd.nd.gov/loans/ag/ag-pace/. Under the loan tab, you can find information about Ag Pace.

Before investing in irrigation equipment, it's crucial to plan ahead. Determine if your soils are irrigable and take time to decide on the system you want, allowing several months for delivery and setup.

Advance planning is crucial for a successful transition from dryland to irrigated production. This involves installing and operationalizing equipment before the growing season.

To avoid costly delays, it's essential to give serious consideration to fall delivery of equipment, allowing time for assembly and setup during the fall or winter months. This will ensure the system is operational before the cropping season begins.

Allowing several months for delivery and setup is a must, as rushing the process can prove costly in both capital outlay and development that may not fit your needs over the 30- to 35-year life of the system.

Here's a rough timeline to keep in mind:

This advance planning will help you avoid costly mistakes and ensure a successful transition to irrigated production.

To determine power availability, you need to consider the options for powering your irrigation system. Electricity is generally the preferred source of power, but it may not be available at the pump site.

If existing power lines are more than a mile from the pump site, an internal combustion engine may be a more economic choice. This is because electricity has lower pumping costs, less maintenance, reliability, and ease of operation compared to engines.

However, construction costs and repayment for extending power lines vary with each electrical provider, so an estimation of annual power use, costs, and construction repayment is necessary to determine the most economical power source.

If electric pumps are used, three-phase power is preferred, but it may not be available or too expensive to bring to the site. Variable frequency drives (VFD’s) and rotary or static phase converters can transform single phase to three-phase power, but early contact with the power supplier is necessary to plan and construct facilities.

Here's a summary of the power options to consider: