Mobile drip irrigation (MDI) combines the high efficiency of surface drip irrigation with the flexibility, lower hardware costs, and convenience of center pivot irrigation. In this system, the drip tubing is attached to center pivot irrigation systems to apply water directly to the soil surface as the driplines are dragged across the field and to create a uniform wetting pattern across the entire irrigated area.
This publication provides direction on estimating soil moisture by the "feel and appearance" method; taking a some soil and rolling it up in a ball then squeezing it between your thumb and forefinger to form a ribbon and noting how it appears and feels. Compare what you see with photographs and/or charts to estimate percent water available and the inches depleted below field capacity.
LEPA and LESA are alterations on a center pivot where the sprinklers are moved much closer to the ground, the spacing between sprinklers is reduced (more sprinklers), and water is emitted at very low pressures. It saves water (18%), it saves energy (less water pumped and pumped at a lower pressure), and it helps growers get better yields especially in areas where water is limiting. However, it has an increased propensity for runoff, and the sprinklers operating below the top of the canopy can require some management changes. In many cases energy savings alone can pay for the increased costs of the additional sprinklers and drop hose. However, the largest profit potential lies in the ability to get improved yields in areas that are water short or have large water losses to wind drift and evaporation.
Troy Peters, Howard Neibling, Richard Stroh, Behnaz Molaei, Hanny Mehanna |
Sep 2019 |
Oregon Crop Water Use and Irrigation Requirements: Provides consumptive use and net irrigation requirements for economically important crops in 27 climatic regions in Oregon. Computations are based on the modified Blaney-Criddle calculation method and climatic database information. ...
Western Oregon Irrigation Guides: Set of irrigation guides for farmers in the Willamette Valley, covering the primary field, row, and orchard crops. Gives an overview of the decisions and factors that go into irrigation system design, operation, and maintenance. ...
Small fruit, vegetable and nursery crops generally require irrigation to produce the quality the market demands and the yield the producer needs. Irrigation technology has changed dramatically over the last thirty years. Independent of which system or mix of systems a grower uses, irrigation management can be challenging. An irrigation program must match the changing demands of the crop with the water supplied.
Drip Irrigation: An Introduction: Discusses the advantages of drip irrigation and how it can help growers use water efficiently. Covers basic concepts related to components and design as well as management considerations such as placement of the tape, timing and rates, maintenance, and adjustments to fertilizer rates.
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