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
Scarlet Crush™
Our new Honeycrisp/Pink Lady® cross is sweet with citrusy notes, plus all that famous Honeycrisp snap and juiciness. Up to to 3” pink/rosy-red fruit is uniform, conical and very attractive. A fine cooking and fresh-eating apple. Keeps up to 6 months. Ripens as early as late September. USPPAF. Best pollinators: Starkspur® Red Rome Beauty, Stark® Jon-A-Red® Jonathan or any Golden Delicious. Zones: 3-6.
Fruits
December 8, 2016
Stark Bro’s Nurseries & Orchards Co. 2017 Variety Showcase [Slideshow]
For more information on these varieties, contact Stark Bro’s Nurseries & Orchards. Stark Bro’s Nurseries & Orchards P.O. Box 398 Read More
Past industry efforts to discover Paradox hybrid seedlings (Juglans hindsii x J. regia) with superior traits have led to advanced selections of Paradox clones, each with unique characteristics. The University of California selection, RX 1, is a top-choice for Sacramento Valley walnut orchardists and others looking for resistance to Phytopthora and good survivability. RX 1 is a cross of Juglans microcarpa x J. regia. It is showing to be one of the most adaptable walnut rootstocks, producing a large tree with the highest yields in replicated trials. USPP#20,649 P3
Fruits
December 7, 2016
Sierra Gold Nursery 2017 Variety Showcase [Slideshow]
Sierra Gold Nurseries in Yuba City, CA, offers two walnut rootstocks, a salt-tolerant pistachio rootstock, and more. Read More
Action shot of an automated strawberry picker from Harvest CROO
Equipment
December 6, 2016
USDA Announces $3 Million For Robotic Agriculture Research
More evidence being found about how people can benefit from automation in the field. Read More
billevans
Apple Grower of the Year
December 6, 2016
2014 Apple Grower Of The Year Bill Evans Dies
Legendary apple grower Bill Evans, who along with his wife, Jeannette, farmed more apple acreage than any grower in the Read More
weedy watermelon field
Crop Protection
December 6, 2016
New Fact Sheet Analyzes Weed Seeds And Their Longevity
Topics covered include how weed seeds travel, when they germinate, and ways they can be eliminated. Read More
Field trials are one component being used to evaluate water and nitrogen use efficiency in lettuce.  A wide array of germplasm is being screened including cultivars of leaf, romaine, iceberg and butter types, mapping populations and non-domesticated primitive types and wild lettuce species.   Photo credit: David Still
Crop Protection
December 6, 2016
Scientists Aim To Improve Nitrogen, Water Use Efficiency In Lettuce
Genetic research intends to develop varieties with enhanced nutrient uptake. Read More
Cannabis plant closeup
Citrus
December 6, 2016
Report: Florida Cannabis Business To Approach $2 Billion By 2020
Lofty projections include a compound annual growth rate of 140%. Read More
Growers participate in a real-time industry survey session at the 2016 Florida Citrus Show
Citrus
December 6, 2016
Florida Citrus Community Tasked To Unify For Stronger Future
A group effort is necessary to forge ahead. Read More
field shot the Produce Peddler Colorado
Crop Protection
December 6, 2016
Orondis Opti Fungicide Receives Registration In Premix Formulation
The product provides control of Oomycete diseases in vegetables and other specialty crops. Read More
BlackPearl® is the best early season cherry, ripening 10 days before Bing and around Chelan. It has exceptional flavor and is extremely firm and crunchy. BlackPearl® is medium size with 20% sugar and keeps better that most other cherries. The tree is hardy and canker resistant. Early season bloom, S4 unknown.
Fruits
December 6, 2016
Fowler Nurseries, Inc. 2017 Variety Showcase [Slideshow]
For more information on these varieties, contact Fowler Nurseries, Inc. Fowler Nurseries, Inc. 525 Fowler Rd. Newcastle, CA 9565827 Phone: Read More
The Latest
Fruits
December 8, 2016
Stark Bro’s Nurseries & Orchards Co.…
For more information on these varieties, contact Stark Bro’s Nurseries & Orchards. Stark Bro’s Nurseries & Orchards P.O. Box 398 Read More
Fruits
December 7, 2016
Sierra Gold Nursery 2017 Variety Showcas…
Sierra Gold Nurseries in Yuba City, CA, offers two walnut rootstocks, a salt-tolerant pistachio rootstock, and more. Read More
Equipment
December 6, 2016
USDA Announces $3 Million For Robotic Ag…
More evidence being found about how people can benefit from automation in the field. Read More
Apple Grower of the Year
December 6, 2016
2014 Apple Grower Of The Year Bill Evans…
Legendary apple grower Bill Evans, who along with his wife, Jeannette, farmed more apple acreage than any grower in the Read More
Crop Protection
December 6, 2016
New Fact Sheet Analyzes Weed Seeds And T…
Topics covered include how weed seeds travel, when they germinate, and ways they can be eliminated. Read More
Crop Protection
December 6, 2016
Scientists Aim To Improve Nitrogen, Wate…
Genetic research intends to develop varieties with enhanced nutrient uptake. Read More
Citrus
December 6, 2016
Report: Florida Cannabis Business To App…
Lofty projections include a compound annual growth rate of 140%. Read More
Citrus
December 6, 2016
Florida Citrus Community Tasked To Unify…
A group effort is necessary to forge ahead. Read More
Crop Protection
December 6, 2016
Orondis Opti Fungicide Receives Registra…
The product provides control of Oomycete diseases in vegetables and other specialty crops. Read More
Fruits
December 6, 2016
Fowler Nurseries, Inc. 2017 Variety Show…
For more information on these varieties, contact Fowler Nurseries, Inc. Fowler Nurseries, Inc. 525 Fowler Rd. Newcastle, CA 9565827 Phone: Read More
Vegetables
December 6, 2016
Rupp Seeds 2016 Vegetable Variety Showca…
For more information, contact, Rupp Seeds: 17919 County Rd. B, Wauseon, OH 43567 800-700-1199; WEBSITE www.RuppSeeds.com FAX 419-337-5491; EMAIL [email protected] Read More
Farm Marketing
December 6, 2016
Registration Is Open For 32nd Annual Nor…
The six-day event for agritourism operators heads to the Northeast with highlights including bus tours, educational sessions and workshops, and business exchange. Read More
Insect & Disease Update
December 5, 2016
Best Practices For Bactericides Key To V…
Approval finally cleared for antimicrobial applications, and now growers wait and hope to see positive results. Read More
Citrus
December 5, 2016
South Florida Endures Driest November On…
Region has not experienced any significant rainfall since Hurricane Matthew. Read More
Fruits
December 5, 2016
Fall Creek Nursery 2017 Variety Showcase…
For information about these varieties, contact Fall Creek Nursery: Fall Creek Nursery 39318 Jasper Lowell Road Lowell, OR 97452 800-538-30015 [email protected] Read More
Fruits
December 5, 2016
Team Coverage: Fruit And Nut Industry Co…
Can’t make it to the biggest fruit and vegetable conferences? No sweat, we’ll take you there. Read More
Vegetables
December 4, 2016
Rispens Seeds 2016 Vegetable Variety Sho…
For more information, contact Rispens Seeds: 1357 Dutch American Way, P.O. Box 310, Beecher, IL 60401 708-946-6560; WEBSITE RispensSeeds.com FAX Read More
GenNext Growers
December 4, 2016
New Loans Available For Small, Beginning…
USDA recently announced streamlined guaranteed Loans and additional lender category for small-scale operators. Read More