Potato Grower

November 2014

Issue link: http://read.uberflip.com/i/407782

Contents of this Issue


Page 55 of 72

www.potatogrower.com 55 Save 10% on all orders prior to December 31, 2014 148663AgVant13.indd 1 9/29/14 12:18 PM Count on AG2000 Magmeter Now Available for 12" Pipe Diameter. 1 . 8 0 0 . 9 7 5 . 8 1 5 3 w w w . s e a m e t r i c s . c o m AG2000 Magmeter • Designed & Built for Irrigators. PROUDLY MADE IN THE USA AG2000 Magmeter AG2000 Magmeter 147575Seamet13.indd 1 7/8/14 2:36 PM tile or are opened to allow slow or free drainage to occur. Subirrigation This system is very similar to a controlled design but with the ability to add water back into the tile to raise the water table. Subirrigation requires the greatest cost, engineering and maintenance. Irrigation should be managed to meet the needs of the crop while keeping in mind the risks involved with a high water table. The water table is managed at a level that provides for crop uptake to meet the water demand but not so high as to reduce aeration in the upper root zone and limit crop development. Once the type of system to be installed is determined, a layout can be chosen. There are two main types of layouts: targeted (sometimes called random) and parallel (or pattern) drainage. In South Dakota, where I am based, targeted drainage is the most common layout because it minimizes the up-front costs by only placing tile in the lower areas where they will be most effective in removing water from the field. A parallel layout is best utilized where the entire field is poorly drained. It creates a series of equally spaced lines that covers an area typically larger than that of a targeted layout. Parallel drainage has a greater cost with a greater length of lines installed, but it also inf luences a greater area for improved production. A cost/benefit analysis is very important to determine your return on investment when choosing a design layout. A drainage or subirrigation system designed for water table management can have a large inf luence on many environmental factors. More information on the effects of tile can be found at www.igrow.org/agronomy/corn/tile- drainage-imapct/. This article is only a brief introduction into the broad design concepts of managing water tables. More information on starting a drainage design can be found at www.igrow.org/agronomy/ corn/evaluating-tile-drainage-design/. Daniel Ostrem is a water resource field specialist with the South Dakota State University Extension system.

Articles in this issue

Links on this page

Archives of this issue

view archives of Potato Grower - November 2014