I have 2 ideas, but they are what we call "hot takes" that come from experience rather than research:
1. Fungus. Sprinklers get water on the leaves of plants, which creates an environment for fungal infections. Although, possibly, drip lines can cause fungal infections of roots and soil. Still, drip lines reduce the need for spraying fungicides on crop leaves.
2. Pump power sources. The water pumps for sprinklers can be very large and very energy-intensive. I've seen more petrol powered water pumps for sprinklers than I have for drip lines. Drip lines can even use gravity to transport water from source to soil, whereas sprinklers must spend energy resisting gravity.
I see your points. Fungus can indeed be a problem with sprinklers because wet leaves are prone to infections. Drip lines, however, mainly wet the soil, reducing the need for leaf fungicides. On the energy front, water pumps for sprinklers are usually more energy-intensive. Drip lines can often work with gravity, which makes them more energy-efficient. According to a study, drip irrigation systems can save up to 30-50% of water compared to sprinklers.
The benefits of drip irrigation are water saving of 50 to 60% over flood irrigation, increased crop yield with improved crop quality, increased crop and soil health, saving in power and labour cost, and community irrigation, crop diversification and protected cultivation is possible. The major challenges of adopting drip irrigation systems are high Initial cost, finance, lack of awareness, technical knowhow, power supply for agriculture, infrastructure challenge, minimum adoption on surface water, maintenance and repair, availability of subsidy.
Whereas a sprinkler irrigation system allows the application of water under high pressure with the help of a pump. It releases water-like rainfall through small-diameter nozzles placed in the pipes. Water is distributed through a system of pipes and sprayed into the air. Therefore, drip irrigation could save more water and money than sprinkler irrigation.
While drip irrigation systems offer significant advantages in water efficiency, crop health, and environmental benefits, they also require careful planning, maintenance, and initial investment. Overcoming these challenges can lead to substantial long-term benefits for farmers in terms of water conservation and improved agricultural productivity.
Drip irrigation offers significant benefits like saving 50 to 60% more water compared to flood irrigation, boosting crop yield and quality, and promoting soil and crop health. It also supports community irrigation, crop diversity, and protected farming. However, challenges such as high initial costs, lack of awareness, and technical expertise hinder its widespread adoption. In contrast, sprinkler irrigation uses high-pressure pumps to spray water like rainfall, which is less water-efficient and cost-effective than drip irrigation.
Bhawna Vijay "Drip irrigation saves water by delivering it right to plant roots, cutting waste. It boosts crop growth and cuts down on diseases, which is great for the environment. Farmers need to plan well and keep it maintained, but it pays off big time: less water used means more savings and better harvests in the long run."
[Drip irrigation is a method in which water is supplied to crops at “specific point” usually at the base of the plant. This method uses a network of pipes ending with small emitters to give water to the plant roots. Whereas, sprinkler (or overhead) irrigation is a method of distributing water in pipes under pressure, and spraying it into the air so that it breaks up into small water droplets and falls to the ground like natural rainfall. As pressurized irrigation systems have better uniformity & higher application efficiency; higher crop yields can be obtained with these methods. The drip/sprinkler systems are suitable where traditional surface irrigation methods do not work properly. For example in desert and hilly terrains pressurized systems can work quite satisfactorily (Bhutta & Azhar, 2005). The drip/sprinkler system can also be used with gravity flow where hydraulic head is available, reducing the initial cost. Such locations are available in northern areas, NWFP and Balochistan.]
.Water Efficiency: Drip irrigation systems deliver water directly to the root zone of plants, minimizing water loss due to runoff. This targeted approach ensures that water reaches the plants' roots where it is most needed, reducing water waste1
.Reduced Evaporation: Drip irrigation systems emit water close to the ground, minimizing evaporation losses compared to sprinkler systems that distribute water through the air. This helps maximize water utilization and reduce water loss1
.Precise Water Delivery: Drip irrigation systems allow for precise water delivery, ensuring that water is applied only where it is needed. This minimizes overspray and reduces water waste on non-targeted areas like sidewalks or driveways1
.Improved Crop Quality: The slow and precise application of water directly to the roots of plants in drip irrigation systems can result in improved crop quality. This method allows for better control over soil moisture levels, which can positively impact crop growth and yield2
Conserves Energy: Drip irrigation eliminates the need for manually moving sprinklers or walking while spraying with a hose, saving time and energy.
.Climate Resilience: Drip irrigation helps farmers cope with water scarcity, erratic rainfall patterns, and prolonged droughts by efficiently utilizing available water resources. It can contribute to building climate resilience within the farming community2
Challenges of Drip Irrigation Systems:
.Initial Setup Costs: Drip irrigation systems can be more costly to install compared to traditional sprinkler systems. However, in the long run, the cost may be offset by increased crop yield and better quality3
Maintenance and Clogging: Drip irrigation systems require regular maintenance to ensure proper functioning. The emitters or micro-spray heads can become clogged with debris, affecting water flow and distribution. Regular inspection and cleaning are necessary to prevent clogging.
.System Design and Installation: Careful study of factors such as land topography, soil, water availability, crop type, and agro-climatic conditions is needed to determine the most suitable drip irrigation system and components for a specific installation. Proper system design and installation are crucial for optimal performance4
.Limited Water Dispersal: Drip irrigation systems deliver water in low amounts over long periods of time. While this is beneficial for water efficiency, it may not be suitable for delivering large volumes of water quickly when water availability is high5
It is important to note that the benefits and challenges of adopting drip irrigation systems can vary depending on specific agricultural practices, crop types, and local conditions. Farmers should carefully evaluate their specific needs and resources before deciding on the most suitable irrigation method.