Better BMP Implementation

Better BMP Implementation

Improving irrigation management can reduce production costs, save water, and reduce the risk of nutrient leaching. Proper irrigation scheduling requires a target irrigation volume, a measure of soil moisture, and a knowledge of how much water the root zone can hold. A method to account for rainfall contribution to volume, soil texture, organic matter content, compaction, rooting depth, hard pan layers, and antecedent soil moisture all are factors in water movement in the soil. One of the problems with making good irrigation management decisions is that water movement in the root zone is difficult to visualize. A dye test can provide a simple and practical method to visualize water movement in the soil by showing the depth and width of irrigation water movement in the soil.

Irrigation Demonstration

The UF/IFAS BMP Implementation Team planned a demonstration to show the effects of over-irrigation on the fate of nitrogen for the Florida Sod BMP Kick-off Event it held at Strickland Sod in New Smyrna Beach. The plan was to put a water-soluble dye (that mimics the movement of water-soluble forms of nitrogen) in a sod field the day prior to the event, water it in, and then dig pits in the sod on the day of the event to show dye distribution in the soil. However, nature did not fully cooperate. Two days before the event, a storm system moved through the area and dumped several inches of rain, saturating the soil. We went ahead with the demonstration, and sprayed a water-soluble dye in two separate areas. A traveling gun was used to apply ½ inch on one of the areas and the other was over-irrigated with 3 inches.

Unexpected Results

Usually, the plot that is over-irrigated will show that the dye has moved down through and beyond the rooting zone. The results of this demonstration were quite interesting in that the usual effect was not observed, but another important lesson was learned. The dye penetrated in both plots to the same depth, about 4 inches. Two factors contributed to this occurrence:

1. The soil was very wet before the demonstration was started, and most of the soil pore spaces were already full of water below the 4-inch depth to which the dye penetrated. When the irrigation water hit the saturated zone, it was not able to penetrate any further and moved laterally towards the drainage ditch.

2. The production field is crowned for drainage purposes (as opposed to being level). Wet field conditions result in excess irrigation or rainfall running off the field.

Important Implications

This demonstration illustrated that when you have crowned fields and soil moisture near field capacity, much of the applied fertilizer can leave the farm via sheet flow regardless of irrigation depth. Although this demonstration was done on a sod farm, producers of other commodities can apply this lesson when making management decisions about fertilization and irrigation under wet soil conditions.

The take-home lessons for growers from this demonstration are as follows:

  • Consider land leveling.
  • Do not fertilize when you have wet soil conditions.
  • Do not fertilize when you expect heavy rainfall.

Additional information on conducting dye tests can be found in the IFAS EDIS Extension document at http://edis.ifas.ufl.edu/HS222. Growers interested in learning more about using dye tests to visualize irrigation can contact their local county Extension office or the UF/IFAS BMP Implementation Team.

Leave a Reply

Featured Stories
Citrus
February 13, 2016
5 Questions With The New American Farm Bureau President
Zippy Duvall weighs in on priority issues. Read More
storm clouds moving across a field
Citrus
February 12, 2016
There’s No Excuse For Farmers To Be Weather Unaware [Opinion]
Studies show if you're not watching the weather, you should be. Read More
John Lawson of Hyrdro Harvest Farms in Ruskin, FL
Berries
February 12, 2016
Central Florida Farm Goes Vertical To Capture ‘Buy Local’ Market
Hydro Harvest Farms in Ruskin has built a loyal following by serving and engaging the community. Read More
Lynn Long talks about what this 2015 UFO Benton on Gisela 3 planting needs to get established at Riveridge Land Company in Sparta, MI, during IFTA 2016.
Fruits
February 11, 2016
Attendees Brave The Cold To Vet Hot Topics At IFTA Conference
Multileader systems, V-trellis systems on tour stops throughout the Ridge growing region in Michigan. Read More
Summer Foley gets crowned Miss Florida Citrus 2015 by 2004 winner Nikki Upthegrove Matthews and reigning Miss Florida Vicotria Cowen
Citrus
February 10, 2016
Who Will Be Crowned Miss Florida Citrus 2016?
Contestants invited to carry on a time-old industry tradition. Read More
field USDA
Disease Control
February 10, 2016
Broad-Spectrum Fungicide Approved For Specialty Crops In California
Rhyme controls powdery mildew, brown rot blossom blight, and leaf rusts. Read More
A selection of Andean dry beans, Phaseolus vulgaris, from the Andean bean diversity panel.

 

Photo by Stephen Ausmus.
Vegetables
February 10, 2016
Pulse Crops Top The List For Research
Scientists are making global contributions by participating in the Feed the Future Grain Legumes Project. Read More
The restoration of this secondary channel of the Napa River was made possible through the Rutherford Reach Restoration Project.
Photo: Gretchen Hayes
Grapes
February 10, 2016
Restoring The Napa River
The Napa River, which has helped create soil perfect for grape-growing in the Napa Valley, is in danger. Fortunately, conscientious Read More
Almond Board of Calif. logo
Nuts
February 10, 2016
Almond Board Working Toward Next-Generation Sustainability Solutions
New sustainability initiatives will bring the almond industry into the 22nd century. Read More
Photo Credit: David Eddy
Nuts
February 10, 2016
Incentives Available For Low-Emission Harvesters 
Almond and walnut growers who use lower-emission harvesting equipment may be eligible for financial incentives. Beginning this year, the USDA Read More
The Latest
Citrus
February 13, 2016
5 Questions With The New American Farm B…
Zippy Duvall weighs in on priority issues. Read More
Citrus
February 12, 2016
There’s No Excuse For Farmers To B…
Studies show if you're not watching the weather, you should be. Read More
Berries
February 12, 2016
Central Florida Farm Goes Vertical To Ca…
Hydro Harvest Farms in Ruskin has built a loyal following by serving and engaging the community. Read More
Fruits
February 11, 2016
Attendees Brave The Cold To Vet Hot Topi…
Multileader systems, V-trellis systems on tour stops throughout the Ridge growing region in Michigan. Read More
Citrus
February 10, 2016
Who Will Be Crowned Miss Florida Citrus …
Contestants invited to carry on a time-old industry tradition. Read More
Disease Control
February 10, 2016
Broad-Spectrum Fungicide Approved For Sp…
Rhyme controls powdery mildew, brown rot blossom blight, and leaf rusts. Read More
Vegetables
February 10, 2016
Pulse Crops Top The List For Research
Scientists are making global contributions by participating in the Feed the Future Grain Legumes Project. Read More
Grapes
February 10, 2016
Restoring The Napa River
The Napa River, which has helped create soil perfect for grape-growing in the Napa Valley, is in danger. Fortunately, conscientious Read More
Nuts
February 10, 2016
Almond Board Working Toward Next-Generat…
New sustainability initiatives will bring the almond industry into the 22nd century. Read More
Nuts
February 10, 2016
Incentives Available For Low-Emission Ha…
Almond and walnut growers who use lower-emission harvesting equipment may be eligible for financial incentives. Beginning this year, the USDA Read More
Potatoes
February 10, 2016
Potatoes Are More Than A Good Source Of …
Researchers have been investigating the enhancement of oxidative qualities through breeding potato selections that are considerably higher in antioxidants than those currently available. Read More
Equipment
February 10, 2016
Get Your Sprayer Ready For Spring
Cleaning equipment, checking for damages, and ensuring proper calibration should be standard procedure before the season begins. Read More
Crop Protection
February 10, 2016
Bayer Contests EPA’s Decision On Insecti…
Company seeks to stop agency’s proposed cancellation of flubendiamide. Read More
Vegetables
February 10, 2016
Vegetable Production: A Lesson In Sustai…
Thanks to the efforts of those producing vegetables, we have an abundance of healthy food options. Read More
Insect & Disease Update
February 9, 2016
University Of Florida Research Receives …
A big chunk of the federal funding will focus on growing the bacterium in a lab. Read More
Citrus
February 9, 2016
Revised Forecast Yields Small Victory Fo…
Updated USDA estimate holds serve again; hasn’t dipped since December. Read More
Apples & Pears
February 9, 2016
State Of The Fruit Industry 2016 [VIDEO]
According to an national poll of fruit growers, fruit industry suppliers, and researchers, the market is poised for growth in Read More
Crop Protection
February 9, 2016
Biopesticides And IPM
Dr. Surendra Dara, Strawberry and Vegetable Crops Advisor and Affiliated IPM Advisor with University of California Cooperative Extension, has long Read More
[gravityform id="62" title="false" description="false"]