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
Wafler apple harvester
Apple Grower of the Year
August 27, 2016
Rock Steady U.S. Apple Crop Forecast
USApple predicts 2016 output will be just slightly higher than in 2015. Read More
UC Cooperative Extension Viticulture Advisor Lindsay Jordan installs a solar “Paso Panel.” (Photo Credit: Matthew Fidelibus)
Grapes
August 27, 2016
Managing Water In California Vineyards
National viticulture symposium provides insights into estimating vineyard irrigation requirements. Read More
A Concord model grape vineyard with a two-tier cordon system. (Photo credit: Tom Zabadel)
Grapes
August 26, 2016
Model Vineyard Looks To Maximize Concord Production
Watching Michigan ‘‘Concord’’ grape growers struggle with stagnant and sometimes declining prices, a team of researchers at Michigan State University Read More
Organic potato grower staring at his crops
Crop Protection
August 25, 2016
Better Biocontrol Options Becoming Available To Organic Growers
New bio-based solutions to effectively control weeds and pests are cropping up. Read More
Marty McKenna and Mark Wheeler grab a photo together at the Florida Citrus Industry Annual Conference
Citrus Achievement Award
August 25, 2016
Working Together For A Common Cause Key To Citrus Success
Cirus Achievement Award winner Marty McKenna says the industry is sustained by strength in numbers. Read More
New citrus grove in Florida
Citrus
August 24, 2016
Florida Citrus Granted New Incentive To Grow On
A state-backed $5.5 million grove renovation/re-establishment program is now available and accepting applications. Read More
Judi Whitson, 2016 Florida Woman of the Year in Agriculture
Citrus
August 24, 2016
Meet Florida’s 2016 Woman Of The Year In Agriculture
Dedication to fostering the state’s farming future defines the latest winner of longtime honor. Read More
University of New Hampshire scientists constructed a linkage map of the seven chromosomes of the diploid Fragaria iinumae, which allows them to fill in a piece of the genetic puzzle about the eight sets of chromosomes of the cultivated strawberry.
Berries
August 24, 2016
Researchers Unravel Genetic Ancestry Of Cultivated Strawberry
A genetic analysis conducted by New Hampshire Agricultural Experiment Station researchers aims to improve modern cultivation efforts of strawberry growers. Read More
Justin Clements, a fifth-year doctoral student in the Molecular and Environmental Toxicology Center working in the Department of Entomology at the University of Wisconsin-Madison, is the recipient of NPC's 2016-2017 Academic Scholarship.
Potatoes
August 24, 2016
Fifth-Year Doctoral Student Receives NPC’s Scholarship For Potato Research
The National Potato Council (NPC) has announced that Justin Clements, a fifth-year doctoral student in the Molecular and Environmental Toxicology Read More
2011 WA IFTA Tour
Fruits
August 24, 2016
Don’t Underestimate The Value Of Production Bus Tours For Your Business [Opinion]
Sure, you can see and talk with virtually anyone in the world through your smart phone, but you can’t shake their hand. Read More
The Latest
Apple Grower of the Year
August 27, 2016
Rock Steady U.S. Apple Crop Forecast
USApple predicts 2016 output will be just slightly higher than in 2015. Read More
Grapes
August 27, 2016
Managing Water In California Vineyards
National viticulture symposium provides insights into estimating vineyard irrigation requirements. Read More
Grapes
August 26, 2016
Model Vineyard Looks To Maximize Concord…
Watching Michigan ‘‘Concord’’ grape growers struggle with stagnant and sometimes declining prices, a team of researchers at Michigan State University Read More
Crop Protection
August 25, 2016
Better Biocontrol Options Becoming Avail…
New bio-based solutions to effectively control weeds and pests are cropping up. Read More
Citrus Achievement Award
August 25, 2016
Working Together For A Common Cause Key …
Cirus Achievement Award winner Marty McKenna says the industry is sustained by strength in numbers. Read More
Citrus
August 24, 2016
Florida Citrus Granted New Incentive To …
A state-backed $5.5 million grove renovation/re-establishment program is now available and accepting applications. Read More
Citrus
August 24, 2016
Meet Florida’s 2016 Woman Of The Year In…
Dedication to fostering the state’s farming future defines the latest winner of longtime honor. Read More
Berries
August 24, 2016
Researchers Unravel Genetic Ancestry Of …
A genetic analysis conducted by New Hampshire Agricultural Experiment Station researchers aims to improve modern cultivation efforts of strawberry growers. Read More
Potatoes
August 24, 2016
Fifth-Year Doctoral Student Receives NPC…
The National Potato Council (NPC) has announced that Justin Clements, a fifth-year doctoral student in the Molecular and Environmental Toxicology Read More
Fruits
August 24, 2016
Don’t Underestimate The Value Of P…
Sure, you can see and talk with virtually anyone in the world through your smart phone, but you can’t shake their hand. Read More
Farm Management
August 24, 2016
Swaying Views On GMO Foods No Easy Task
Featured speaker for the upcoming FFVA Annual Convention says tides are slowly turning in how people digest the concept of genetic modification. Read More
Grapes
August 23, 2016
Deeper Irrigation Method Showing Promise…
A new subsurface irrigation system is showing promise for slashing water usage in vineyards. Many vineyards use drip lines that Read More
Disease Control
August 23, 2016
Florida Sweet Corn Has New Deadly Stalke…
Learn how to identify, the survival and spread, as well as management methods for this disease. Read More
Fruits
August 23, 2016
New Insecticides Geared To Give Growers …
Check out three unique chemistries from several of the industry's leading crop protection suppliers. Read More
Apple Grower of the Year
August 22, 2016
Apple Crop Forecasts Live On Twitter
You'll be able to get up-to-the-minute reports of not only the various regions of the U.S., but key production regions around the world. Read More
Oranges
August 22, 2016
Major OJ Purchase Promises Relief For Fl…
$30 million planned acquisition from USDA to be used for surplus removal. Read More
Varieties & Rootstocks
August 22, 2016
Florida Citrus Breeders Squeezed For Tim…
The pressure is on to develop a more HLB-tolerant orange. Read More
Pest Control
August 21, 2016
Spotted Wing Drosophila: For Michigan, …
Why the pest can be so much more destructive for Eastern cherry growers might be due to what they’re not farming. Read More
[gravityform id="62" title="false" description="false"]