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

CitrusBe Willing To Take A ‘Wild Turkey’ Approach To Farm Fixes [Opinion]
November 27, 2014
Editor Frank Giles says Florida Grower will be stepping up to the bully pulpit in 2015 addressing topics that impact the industry the most. Read More
CitrusNew Partnership To Expand ‘Fresh From Florida’ Footprint In Taiwan
November 26, 2014
Latest deal puts exclamation point on successful Asia marketing campaign. Read More
Insect & Disease UpdateCalifornia OKs Asian Citrus Psyllid Insecticide
November 26, 2014
Agriphar Crop Solutions’ Micromite 80WGS is also effective on several other citrus pests. Read More
VegetablesAmerican Takii Presents Its Latest Vegetable Varieties
November 26, 2014
For more information, contact: American Takii 301 Natividad Rd. Salinas, CA 93906 831-443-4901; fax: 831-443-3976 takii.com Read More
FruitsWet December Predicted For Parched California
November 25, 2014
National Weather Service says above-normal precipitation expected; it may continue through the winter in central and southern parts of the Golden State. Read More
Apples & PearsEPA Approves Three New Moth Mating Disruption Products
November 25, 2014
Codling moth and oriental fruit moth are targeted by apple and pear growers. Read More
VegetablesSakata Hosts Annual Fall Field Trials
November 25, 2014
Growers and dealer partners gather to see new varieties at the company's South Florida field station. Read More
VegetablesStokes Seeds Presents Their Latest Vegetable Varieties
November 25, 2014
For more information, contact: Stokes Seeds P.O. Box 548 Buffalo, NY 14240-0548 800-263-7233; fax: 800-272-5560 stokesseeds.com Read More
VegetablesAbbott & Cobb Presents Their Latest Vegetable Varieties
November 25, 2014
For more information, contact: Abbott & Cobb P.O. Box 307 Feasterville, PA 19053 800-245-SEED; fax:215-245-9043 abbotcobb.com Read More
VegetablesVariety Trials 2014: Rupp Seeds
November 25, 2014
Check out new pumpkins weighing between 18 and 20 pounds as well as new powdery-mildew tolerant butternut squash hybrids. Read More

The Latest

CitrusBe Willing To Take A ‘Wild Turkey’ Approach…
November 27, 2014
Editor Frank Giles says Florida Grower will be stepping up to the bully pulpit in 2015 addressing topics that impact the industry the most. Read More
CitrusNew Partnership To Expand ‘Fresh From Florida’ Foot…
November 26, 2014
Latest deal puts exclamation point on successful Asia marketing campaign. Read More
Insect & Disease UpdateCalifornia OKs Asian Citrus Psyllid Insecticide
November 26, 2014
Agriphar Crop Solutions’ Micromite 80WGS is also effective on several other citrus pests. Read More
VegetablesAmerican Takii Presents Its Latest Vegetable Varieties
November 26, 2014
For more information, contact: American Takii 301 Natividad Rd. Salinas, CA 93906 831-443-4901; fax: 831-443-3976 takii.com Read More
FruitsWet December Predicted For Parched California
November 25, 2014
National Weather Service says above-normal precipitation expected; it may continue through the winter in central and southern parts of the Golden State. Read More
Apples & PearsEPA Approves Three New Moth Mating Disruption Products
November 25, 2014
Codling moth and oriental fruit moth are targeted by apple and pear growers. Read More
VegetablesSakata Hosts Annual Fall Field Trials
November 25, 2014
Growers and dealer partners gather to see new varieties at the company's South Florida field station. Read More
VegetablesStokes Seeds Presents Their Latest Vegetable Varieties
November 25, 2014
For more information, contact: Stokes Seeds P.O. Box 548 Buffalo, NY 14240-0548 800-263-7233; fax: 800-272-5560 stokesseeds.com Read More
VegetablesAbbott & Cobb Presents Their Latest Vegetable Varie…
November 25, 2014
For more information, contact: Abbott & Cobb P.O. Box 307 Feasterville, PA 19053 800-245-SEED; fax:215-245-9043 abbotcobb.com Read More
VegetablesVariety Trials 2014: Rupp Seeds
November 25, 2014
Check out new pumpkins weighing between 18 and 20 pounds as well as new powdery-mildew tolerant butternut squash hybrids. Read More
Food SafetyMultistate Salmonella Outbreak Linked To Bean Sprouts
November 25, 2014
FDA and the Centers for Disease Control and Prevention along with state and local officials continue to investigate the food-borne illness outbreak. Read More
Insect & Disease UpdateCitrus Survey: New Management Techniques Trending
November 25, 2014
Growers widen their tactical approach to survive HLB. Read More
FruitsFruitGrowerConnect Brings Buyers And Sellers Together […
November 25, 2014
Suppliers and growers got down to business in San Diego discussing current needs, solutions, and ways to increase efficiencies on the farm. Read More
Vegetables15 Must Have Carrot Varieties [Slideshow]
November 24, 2014
Browse the slideshow for information on 13 carrot varieties to add to your collection. Read More
CitrusReasons Aplenty Florida Growers Should Feel Good Going …
November 24, 2014
Thanks to recent industry achievements, the next 12-month period is shaping up to be a year to remember --- fondly. Read More
BerriesSuspected Borer Could Be Big Bother To Florida Blueberr…
November 24, 2014
Producers warned to be on the lookout as scientists probe samples. Read More
NutsWatch Your Almonds’ Salt Intake
November 24, 2014
Because of the current California drought, almond growers must pay extra attention to soil salinity. Read More
Varieties & RootstocksHelp On The Way Citrus Growers Can Truly Tap Into
November 24, 2014
Demand for inventory to rise as USDA’s Tree Assistance Program pushes new plantings. Read More