Field Day to Feature GA and Nutrition Trials

Ernie Neff Nutrition

Growers will have the opportunity to learn more about recent citrus research trials on nutrition and gibberellic acid (GA) and their impact on tree health. University of Florida Institute of Food and Agricultural Sciences (UF/IFAS) Extension Polk County will host a field day on Dec. 14 to share research findings with growers. The field tours will begin with an overview …

Fertilization Splitting Helps With HLB

Ernie Neff HLB Management, Nutrition

Researchers at the University of Florida have found a way to manage groves infected with HLB by managing the timing of their fertilization. By splitting the application of nutrients to citrus rootstocks, they have been able to improve plant growth and fruit yields. The research was recently published in Soil Science Society of America Journal. Alisheikh Atta and his colleagues …

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Nutrition and Yield in the Face of HLB

Ernie Neff Nutrition

Fertilization frequency, micronutrient management and rootstocks can all impact the yield of HLB-affected sweet oranges, Tripti Vashisth recently told a Citrus Nutrition Day audience in Lake Alfred, Florida. The educational event was held at the Citrus Research and Education Center, where Vashisth is a University of Florida Institute of Food and Agricultural Sciences (UF/IFAS) horticulturist. FERTILIZATION FREQUENCYHLB-affected trees should be …

Fertilization Methods: Pros and Cons

Ernie Neff Nutrition

Brandon White with the University of Florida Institute of Food and Agricultural Sciences discussed the pros and cons of several types and methods of citrus fertilization at Citrus Nutrition Day on Oct. 26. The event was held at the Citrus Research and Education Center in Lake Alfred, Florida. White recently became the new commercial fruit crop agent for Florida’s Lake …

An Improved Method of Nutrient Analysis

Tacy Callies Nutrition, Technology, Tip of the Week

By Yiannis Ampatzidis and Ute Albrecht Optimizing nutrition is important for tree health and productivity and can improve tolerance to stresses and diseases. Good nutrient management requires regular field monitoring to identify problems and examine crop responses. Leaves need to be collected and sent to a specialized laboratory for detailed information on macronutrients and micronutrients, which is time-consuming and costly. …

The Fate of Phosphorus in Florida Citrus Soils

Ernie Neff Nutrition, soil

Multi-county citrus Extension agent Chris Oswalt discussed the fate of phosphorus in Florida citrus soils in the September Extension newsletter, Citrus from the Ridge to the Valley. Excerpts from his article follow. The amount of phosphorus in soil is closely related to the potential availability of this phosphorus to plants … Potentially available soil forms of phosphorus are dependent on …

Stepping Up Phosphorus Sustainability

Ernie Neff Environment, Nutrition

Two University of Florida Institute of Food and Agricultural Sciences (UF/IFAS) researchers have joined a national research effort to promote phosphorus sustainability across the United States. The researchers will work under the funding auspices of the National Science Foundation’s Science and Technology Center in the newly established Science and Technologies for Phosphorus Sustainability (STEPS). In addition to the University of …

Regular Leaf Nutrient Analysis Improves HLB-Affected Trees

Tacy Callies Nutrition

By Tripti Vashisth and Davie Kadyampakeni Nutrition management is complex! Multiple factors affect the nutrient uptake and availability in trees. For example, high soil pH can limit the uptake of soil-applied micronutrients such as zinc (Zn) and manganese (Mn). Oxide forms of nutrients might be less available than nitrate or sulfur forms. Moreover, the time and method of nutrient application …

Lessons on Yield and Root Health From Modified Nutrition

Tacy Callies Nutrition

By Davie Kadyampakeni, Evan Johnson, Kelly Morgan and Ali Atta Citrus production in Florida has been decreasing over the last 15 years due to several factors, with huanglongbing (HLB) a major driver. This disease has severe effects on citrus growth and production, including stunted vegetative growth, misshapen small fruits and poor color development, root mortality, stunted branches, excessive fruit drop, …

Impact of High-Density Planting and Enhanced Nutrition on HLB-Affected Grapefruit

Tacy Callies Nutrition

By Rhuanito S. Ferrarezi, Waqar Shafqat, Hernan Soto, Mark Ritenour, Lorenzo Rossi,Davie Kadyampakeni, Evan Johnson and Kelly Morgan Florida citrus growers have been using high-density planting and different soil and foliar fertilizer application strategies to compensate for the adverse effects of huanglongbing (HLB). Recent studies indicate that high-density plantings and enhanced nutritional programs with higher micronutrient levels, such as the …

Irrigation and Nutrient Management BMPs

Ernie Neff BMPs, Irrigation, Nutrition

A Citrus Expo presentation about best management practices (BMPs) focused on what growers should be doing now in their irrigation and nutrient management programs. The presentation noted that current BMPs were developed prior to HLB’s discovery in Florida in 2005, and that studies are underway to revise the citrus BMPs for nitrogen and phosphorus. The presentation was created by University …

Technologies for Improved Nutrient Analysis

Tacy Callies Nutrition, Technology

By Yiannis Ampatzidis and Ute Albrecht Nutrient management is important for citrus production. Regular nutrient assessments should be conducted to optimize nutrient balance and prevent deficiencies or over-fertilization. Optimizing nutrition is important for tree health and can improve tolerance to stresses and diseases. Good nutrient management requires regular field monitoring to identify problems and examine crop responses. Leaves need to …

Optimizing Macronutrients and Micronutrients

Tacy Callies Nutrition, Tip of the Week

By Davie Kadyampakeni Nutrients are needed for optimal tree growth, fruit yield and juice quality. Any nutrient deficiencies could result in low yields and decreased revenue. It is important to make sure citrus trees always receive adequate nutrient supplies. Nutrients are categorized into two groups: macronutrients and micronutrients. MACRONUTRIENTSMacronutrients are those nutrients needed in large quantities to influence yield, growth …

HLB and Citrus Nutrition

Ernie Neff HLB Management, Nutrition

Tripti Vashisth shared results of research into nutrition needs of citrus trees with HLB during a recent virtual educational program sponsored by the Citrus Research and Development Foundation and Florida Citrus Mutual. Vashisth is a University of Florida Institute of Food and Agricultural Sciences horticulturist at the Citrus Research and Education Center in Lake Alfred. Here are a few key …

Making Sense of Biologicals – Biofertilizers: Improving Nutrition in Citrus Trees

Tacy Callies MSOB, Nutrition

Citrus greening disease appears to be a problem for the foreseeable future for Florida growers. But what if growers could improve nutrition so trees could better cope with the disease? Scientists at Douglas Plant Health believe biofertilizers have that capability. “Think about it from a human health standpoint,” says Marcus Jones, vice president of research and development at Douglas Plant …

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Growers Benefit From Citrus Nutrition Box Program

Ashley Robinson Nutrition

Florida growers participating in the University of Florida Institute of Food and Agricultural Sciences (UF/IFAS) citrus nutrition box program have found great value in the program. Now in its second year of operation, the program provides free soil and leaf testing as well as tailored quarterly nutritional counseling. These free boxes of materials and instructions are distributed to registered growers …

Effect of Nutrients on Canopy Response and Yield

Tacy Callies Nutrition

By Davie Kadyampakeni, Tanyaradzwa Chinyukwi, Alan Wright and Rhuanito Ferrarezi The development of an efficient nutrition program for citrus trees provides the essential elements for optimum tree growth and yield. Tree performance is reduced when an essential element is deficient, while an excessive amount leads to plant toxicity and hinders overall tree performance. In citrus production, adequate fertilization rates help …

Sap Analysis for Detecting Nutrient Levels

Ernie Neff Nutrition

Monitoring tree nutrient content via sap analysis is a fairly new concept in Florida citrus, but has at least a decades-long history in other crops. That history and other background information about the technique were addressed in a recent University of Florida Institute of Food and Agricultural Sciences (UF/IFAS) virtual seminar. The workshop’s purpose was to introduce Florida’s citrus growers …

citrus acreage decline

Grower Instigates Sap Analysis Research

Ernie Neff Nutrition

Indian River area citrus grower Cody Estes provided the impetus for an upcoming research project into the use of sap analysis for monitoring citrus tree nutrient levels. The analysis method has been used in other crops. Advocates declare it to be a relatively inexpensive way to quickly determine nutrient status so growers can make corrections before nutrient excess or deficiency …

The Impact of Soil pH on Nutrients

Ernie Neff Nutrition

In the April Central Florida citrus Extension newsletter, multi-county citrus Extension agent Chris Oswalt discussed the fate of the nutrients nitrogen, phosphorus and potassium in soils that have elevated pH values. Here’s most of the discussion he presented: Soil pH can affect several reactions involving nitrogen in the soil solution and the efficient use of this nitrogen by plants. Nitrification, …