From the Archives: Wild Oranges

During his travels in the 1700s, a botanist named Bartram reported finding wild citrus groves scattered along lakes and rivers. He stated that the majority of them were found growing with magnolia and bay trees and that the environment was perfectly suited for citrus growth. It is believed that the Native Americans in the area were responsible for planting these wild citrus groves. They most likely got the seeds from white settlers in the region as citrus originated from Europe.

When early settlers began to make a home in Florida, they began to graft and cultivate these citrus groves. A grove is defined as a naturally growing body of trees while an orchard is characterized as being a planned planting that is going to be harvested. Groves are trees that are typically free of underbrush.

Early settlers made attempts to cultivate the citrus groves in formation; however, they realized how difficult it was to grow seedlings in these conditions. This is when the citrus nursery was first implemented. Seedlings are planted in separate regions, and when they become large enough, the seedlings are then moved to the large-scale grove with the already adult trees.

Written by Tanzy Zviitwah, Florida Citrus Hall of Fame Fellow
In partnership with Florida Southern College’s McKay Archives Center
Spring 2024

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Sources:

Mack, Thomas B. Citrifacts II: A Portion of Florida Citrus History. Bartow, Florida: Associated Publications Corporation, 1998.

From the Archives: Using Animal Manure as Fertilizer

In a correspondence between Prof. W. L. Drew and Link & Bagley, dealers of Stable and Dairy fertilizers, Drew brings up the idea that their fertilizer could aid in the growth of his citrus groves. He credits the Citrus Industry magazine for the idea that animal manure would work very well in the growth of citrus.

There are several benefits to using animal manure as fertilizer, besides the low cost. Animal manure is rich in nutrients that plants depend on such as nitrogen, phosphorus, and potassium. Nitrogen is essential for chlorophyll production aiding in the overall health and growth of plants; phosphorus is used for ATP, or energy production, which is very important for flowering and blooming in plants; potassium is necessary for the use of several enzymes within plants and is essential for photosynthesis and water uptake in plants.

In some cases, animal manure can also help to regulate the pH levels of the soil. When soil is too acidic, this can lead to a decrease in the important nutrients discussed earlier. It can also stunt plant growth and cause browning of the leaves; in some cases, it can even lead to plant death.

Using animal manure also decreases the chances of runoff taking place. When using chemical fertilizers, excess nutrients can get washed into bodies of water. This can be very detrimental to the surrounding environment and lead to excessive algae growth. This is known as algae blooms, and it is caused by excessive nitrogen and phosphorus, the main nutrients in chemical fertilizers.

The addition of manure to soils helps improve the structure of soil making it better at holding water for longer periods of time. This is beneficial because during dry periods plants continue to have access to water stores being held in the soil. This reinforced soil structure is also less likely to erode when compared to regular soil structures.

Overall, the use of animal manure makes sense for various reasons.

Written by Tanzy Zviitwah, Florida Citrus Hall of Fame Fellow
In partnership with Florida Southern College’s McKay Archives Center
Spring 2024

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Sources:

Furiness, Cari, Ellis Cowling, Lee Allen, Robert Abt, Doug Fresrick, Kelly Zering, and Robert Campbell. “Using Animal Manures in Forest Fertilization.” North Carolina State Extension, January 1, 2011. https://content.ces.ncsu.edu/using-animal-manures-in-forest-fertilization.

Mack, Thomas B. Citrifacts II: A Portion of Florida Citrus History. Bartow, Florida: Associated Publications Corporation, 1998.

From the Archives: Citrus Experiment Station

In 1917, the Citrus Experiment Station was established at Lake Alfred. They started with 84 acres of land and $13,000 that had been raised by local growers. In 1923, Florida Legislators provided the station with $15,000 for the 1923-1924 fiscal year; this would be approximately $230,000 today. In 1926, the first permanent buildings were constructed; up until this point, they had been operating out of temporary buildings. By 1965, the station had multiple buildings and was spread out across 285 acres of land.

In the beginning, the goal of the station was to perfect already existing methods used for growing, packing, and processing citrus. These small changes helped to increase the efficiency of the field and helped grow the Florida Citrus Industry. In the 1940s, the staff at the experiment station were working on perfecting the processing of citrus concentrate. They received the patent for this process in 1948.

The station underwent a name change in 1970 and began going by the Agricultural Research and Education Center (A.R.E.C). It is currently known as the Citrus Research and Education Center (C.R.E.C.). They are currently working on several topics at the moment including protoplast and cell culture, genetic engineering, and applied plant breeding. The staff at the citrus institute is made up of 250 individuals; 50 of them are also faculty members at the University of Florida.

It is important to keep doing research in the citrus field because it helps growers to increase their yields. Citrus greening is a bacteria that makes both the fruit and tree look as though they lack nutrition and makes the fruit inedible. To combat this, C.R.E.C is working on genetically modifying certain citrus trees, so that they are resistant to this bacteria. The hope is that they will be able to distribute these trees to growers.

Written by Tanzy Zviitwah, Florida Citrus Hall of Fame Fellow
In partnership with Florida Southern College’s McKay Archives Center
Spring 2024

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Sources:

Borger, Ruth. “University of Florida awarded key federal grants to continue fight against citrus greening.” UF IFAS Blogs, University of Florida, October 22, 2020. https://blogs.ifas.ufl.edu/news/2020/10/22/university-of-florida-awarded-key-federal-grants-to-continue-fight-against-citrus-greening.

Mack, Thomas B. Citrifacts II: A Portion of Florida Citrus History. Bartow, Florida: Associated Publications Corporation, 1998.

From the Archives: Soil Science Foundation

In 1939, the Soil Science Foundation was started by a group of farmers in Dade City who were looking to come up with solutions that they were facing with their various crops; the Soil Science Foundation is credited with several scientific accomplishments. Their first headquarters was a small building on the campus of Florida Southern College, and they did not relocate off campus for 10 years.

When the Foundation started, they were running experiments on the fertilization of sandy soils at the Short Grove in Lake County. Sandy soils do not hold nutrients well, meaning fertilization is necessary to ensure that crops are able to obtain the necessary nutrients for growth. However, over fertilization can be harmful for plants as it will change the pH of the soil, suffocate the soil, and cause root damage. The goal of the experiments being run by the foundation was to determine the necessary amount of fertilizer.

During this time, the Foundation also researched the sustainability of Florida flatwoods for citrus planting. Florida flatwoods make up a large portion of Florida’s landscape. Flatwoods are ideal for citrus cultivation because of their sandy moist soils. Citrus does well in sandy soils because it provides good drainage, which prevents root damage from taking place. Planting in flatwoods also helps with irrigation because of the water deposits that are typically found within these flatwoods. However, there may be some disadvantages to planting citrus on these lands. During wet seasons, the soil can become overly saturated due to the water deposits already existing in the soil, they are at risk to develop frost that can cause freeze in citrus, and cultivating citrus in these regions could negatively impact the environment and decrease the biodiversity of the region. The goal of the experiments targeting citrus cultivation on the flatwoods was to determine if using the flatwoods would result in significantly better yields.


To learn more about the Soil Science Foundation, please check out the Soil Science Foundation Records at the McKay Archives: https://www.flsouthern.edu/getattachment/96400c75-e443-47c6-9fc7-690feef0137c/Soil-Science-Foundation-Records-Finding-Aid.pdf.

Written by Tanzy Zviitwah, Florida Citrus Hall of Fame Fellow
In partnership with Florida Southern College’s McKay Archives Center
Spring 2024

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Source:
 

Mack, Thomas B. Citrifacts. Bartow, Florida: Associated Publications Corporation, 1992.

From the Archives: Cattle Feed

In the 1900s, growers began to feed cattle the leftover pulp, peels, and seeds that were left behind after the desirable parts of citrus fruit had already been canned for production. Because pulp has a high liquid concentration, it went bad faster than the cattle could eat it. This left much of the feed to rot out in the pastures. This led researchers to run feed tests to determine if the citrus by-products were providing any nutrition for their cattle. This research found that only the pulp had any actual nutritional value that would be beneficial to the cattle while both the peel and seeds did not have any value to them.

Upon this discovery, there was a race to patent citrus pulp as feed. Everyone wanted a chance at reaping the rewards for this invention. The Pratt Food Company was one of the first plants that popped up in Tampa with the sole purpose of processing citrus waste. After this, several other companies opened branches that were responsible for dealing with citrus waste.

In order for the pulp to be fed to the cattle, it had to be dried. Reducing the liquid concentration in the pulp allowed the growers to store the pulp for later use without it going bad due to the liquids being held inside the pulp. There are many advantages to using dried citrus pulp for feed. Citrus pulp is a very bulky carbohydrate meaning cattle do not need to eat a lot of it and pulp is high in calcium. However, pulp is low in phosphorus, one of the major nutrients that cattle need, meaning it must be supplemented with other forms of feed to ensure that cattle stay healthy. Citrus pulp is still being used for feed today; however, it is not used for milking cows as it can cause a decrease in milk production.

Written by Tanzy Zviitwah, Florida Citrus Hall of Fame Fellow
In partnership with Florida Southern College’s McKay Archives Center
Spring 2024

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Source:
 

Mack, Thomas B. Citrifacts. Bartow, Florida: Associated Publications Corporation, 1992.

From the Archives: Traveling Citrus in Egypt

In 1992, Dr. Prevatt visited the Nile Delta region of Egypt as a citrus expert for six weeks in May and June. During this time, he worked with the Agricultural Cooperative Development International program; the goal of this program was to create a line of dialogue between Egyptian and American farmers and researchers. Prevatt was selected to be the citrus expert because of his background knowledge in citrus. The main objective of his role was to help the growers in the region of interest with any issues they may be facing regarding their crops.
 

Upon arrival, Prevatt was tasked with determining what the major problems in the area were. He concluded that the region was plagued with poor irrigation, Phytophthora foot rot and psorosis were killing trees, lack of a hedging program, excessive use of chemical fertilizers, and closed plantings.
 

At the time, farmers had begun growing citrus in a region referred to as the “New Lands.” This area is made up of sandy desert soils. Other regions where citrus production takes place have silt soil. This means that the same farming practices cannot be used in both regions due to the differences in the soil. Silt soil is a combination of sand and clay. It is an extremely fertile type of soil because it is very good at water retention. Due to the aforementioned fertility of silt, it does not need to be fertilized often. Silt soil is one of the ideal soils for citrus production due to its loose form and drainage properties; Prevatt comments on the effects over-fertilization is having on the crops. For centuries, the Nile River would flood and deposit more silt on its banks. This flooding was later controlled by the production of the Aswan Dam in 1968. Sandy soil is made up of fine particles and is loosely packed. Due to this loose packaging, sandy soil tends to need to be fertilized because it does not hold on to nutrients well. Besides this, it is a good soil for citrus production as long as it is fertilized to ensure there are adequate nutrients present.
 

However, the biggest problem with citrus production in the New Lands is the lack of water. The Egyptian government was attempting to install canals and waterways to aid in agriculture. Due to a lack of funds and resources, the installation of these irrigation systems was not an easy one. Regardless, Dr. Prevatt made attempts to give help where applicable. Dr. Prevatt comments on an interaction he had with a farmer in Cairo. Upon meeting this farmer for what Prevatt thought was the first time, the farmer exclaimed “I know you” to Prevatt. After some discussion, they realized that the farmer had visited Florida Southern College years ago as part of a citrus exchange program. The Agricultural Cooperative Development International program has helped people all over the world and given people the opportunity to visit places they may have never seen.

Written by Tanzy Zviitwah, Florida Citrus Hall of Fame Fellow
In partnership with Florida Southern College’s McKay Archives Center
Spring 2024

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Source:
 
Mack, Thomas B. History of the Citrus Institute, Florida Southern College, 1947-1993. Lakeland, Florida: Florida Southern College, 1993.

From the Archives: Traveling Citrus in China

In 1986, Dr. Prevatt had the opportunity to visit China with 52 students from the Florida State Horticulture Society. During this trip, they experienced both Chinese culture and traditions while having the opportunity to learn about their governmental policy and produce.
 

The first leg of their trip was spent doing tourist-like activities and going to see major historical sites, including the city of Shanghai. Shanghai is a heavily populated city on the port of the Yangtze River, and it runs under an integrated society meaning the government ensures that all its people have work.
 

The group also took a trip to “The Garden City of the World” during this trip, and they were in awe of the artistry that was on display. Prevatt comments on how the people made intricate designs using different plants, rocks and the occasional waterfall.
 

Tourism was not the only goal of this trip; the group moved on to learn more about the various horticulture techniques used in China. Mandarin is the primary citrus grown in China. Most of the land in China has poor drainage meaning the soil does not dry out easily post irrigation. This can be disastrous to produce because it stops plants from being able to take up oxygen through the roots. To combat this, citrus trees are only grown on high beds of land - this helps in making drainage more efficient. Prevatt noted that the Chinese tend to do most farm work by hand with very little machinery to help.
 

This trip was made possible due to the help and cooperation of the U.S. China Exchange Center; they linked the group with a native tour guide to help them get a full experience of the area. Not only were they able to have one-on-one interactions with the farmers, but they also got to see countless historical sites. China is currently the leading producer of citrus in the world making up 28.77% of the world's citrus.

Written by Tanzy Zviitwah, Florida Citrus Hall of Fame Fellow
In partnership with Florida Southern College’s McKay Archives Center
Spring 2024

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Source:
 
Mack, Thomas B. History of the Citrus Institute, Florida Southern College, 1947-1993. Lakeland, Florida: Florida Southern College, 1993.

From the Archives: Traveling Citrus in Europe

For five weeks in 1982, Professor Mack, along with six students, toured the common markets in Europe. The goal of this adventure was to see firsthand how citrus, among other fruits, was handled and marketed in major importing hubs in Europe. They visited a total of 7 countries including England, Belgium, The Netherlands, Germany, Switzerland, Spain, and France. 

While in England, they had the opportunity to see how apples were grown, produced, and sent out all over the continent. During their 4 week-long road trip across Europe, they spoke with buyers, marketers, and importers of Florida citrus specifically. They had the unique experience of seeing how these markets work behind the scenes. 

The goal of traveling to Spain was to observe the citrus growing styles and the research that was being done on citrus. Today, Spain is the leader in citrus production making up 56% of citrus production in Europe. Spain is well suited for citrus growth for a multitude of reasons, especially the climate as they have hot dry summers. However, this is paired with relatively cold winters, low humidity, and little rainfall, making irrigation a necessity. Although irrigation may be difficult, they are still able to produce large amounts of fresh fruit every year. 

This trip was not only spent learning about produce and how it is grown or marketed. Students had down time to learn more about the cultures and see historical land sites and monuments. In 1983, Mack orchestrated another tour of Europe; however, this one was not nearly as detailed as the tour the year before had been. Both tours gave students memories that most people can only dream of, and the memories they gained will hopefully last a lifetime. 

 

 

Written by Tanzy Zviitwah, Florida Citrus Hall of Fame Fellow
In partnership with Florida Southern College’s McKay Archives Center
Spring 2024

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Sources:
 

Díaz, Sergio. “Citrus Fruit: A Leading Sector Despite the Complicated Context.” CaixaBank Research, October 4, 2022. https://www.caixabankresearch.com/en/sector-analysis/agrifood/citrus-fruit-leading-sector-despite-complicated-context.

 

Mack, Thomas B. History of the Citrus Institute, Florida Southern College, 1947-1993. Lakeland, Florida: Florida Southern College, 1993.

 

From the Archives: Traveling Citrus in Mexico

Dr. Rubert Prevatt and Professor Tom Mack spent a month in Texas in the 1980s. During this time, they crossed the border into Mexico to learn more about one of the world's top citrus producers. The goal of this trip was to observe how they were combating the different obstacles they faced due to the climate in Mexico.  They visited the Campo Agricola Experimental Station where they were able to view all the experiments that were currently being practiced.

The regions where citrus is grown are notoriously arid, extremely dry, and to combat this, they use flood irrigation. This is an extremely wasteful irrigation style as it uses significantly more water than other irrigation methods. During flood irrigation, the land flood gates are opened allowing a large body of water to flow into the area this creates several disadvantages: 80% of the water is being lost as run off or evaporation, all sections of land do not receive the same amounts of water, which may cause anaerobic conditions in the soil. Because the soil is over saturated with water, this can cut off access to oxygen making respiration difficult for plants. Plants are only able to take up oxygen through their roots, but if there is no oxygen in the soil, the plant becomes void of oxygen.

The farmers at Campo Agricola were working on implementing a different irrigation system that would be more cautious of how they used the available resources. Their main focuses were seeing if they could use less water during the flooding and if they could use sprinkling or drip irrigation; as you can imagine, this method uses significantly less water than flood irrigation. With all the issues they face, one would not expect the Mexican citrus industry to be as big as it is. Mack comments on how he foresees the industry continuing to improve as the years pass. Mack was correct in his views, citrus production in Mexico has been steadily increasing over the years. Currently, Mexico produces 7.7% of the world's citrus.

Written by Tanzy Zviitwah, Florida Citrus Hall of Fame Fellow
In partnership with Florida Southern College’s McKay Archives Center
Spring 2024

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Source:

Mack, Thomas B. History of the Citrus Institute, Florida Southern College, 1947-1993. Lakeland, Florida: Florida Southern College, 1993.

From the Archives: Traveling Citrus in New Zealand

Florida Southern College’s Citrus Institute aimed to give students not only an exceptional in-classroom education, but also a hands-on experience; with citrus groves planted all around campus, students had a learning experience unlike any other. The faculty were also well versed in the different techniques used all over the world thanks to their own hands on learning. Professor Tom Mack spent time in New Zealand in 1982 and spent his time abroad learning more about their citrus culture.
 
New Zealand is located on the limit for citrus culture and only on the northern and north eastern sections of the north island can citrus be feasibly grown. Ideal conditions for citrus include warm and sunny positions and temperature ranging from 50-55 degrees Fahrenheit; anything below 45 could possibly kill the plants. Upon hearing this, one can understand why Florida is the ideal place for citrus production. The lack of sunshine during the summers in New Zealand results in small, slow growing fruits, usually with poor yield.

During his time in New Zealand, Mack was able to see several similarities and differences in planting habits. The country is known for its strong winds in an effort to protect citrus cultures; they plant windbreakers which have been effective in sheltering the plants up to a specific distance. They also grew citrus crops on significantly smaller areas in order to grow more plants per the area to secure a reasonable income for the grower. They did not have significant issues with pests or diseases killing crops, but they continue to take precautions to ensure that this remains the reality. Mack remarks on the fumigation process that takes place the moment an airplane lands in the country.

New Zealand is far from being one of the world's top producers in citrus, but they are well on their way in kiwifruit. Growers in different parts of the country were seen to be growing kiwifruit in between the citrus plantings in the hopes of cutting down the citrus trees once the kiwifruit has matured. Mack ends his account commenting on how the New Zealand citrus industry will never be a threat to the Florida citrus grower. Currently,  New Zealand makes up about 0.05% of the world's citrus production. Safe to say, Professor Mack was right in his conclusion.

Written by Tanzy Zviitwah, Florida Citrus Hall of Fame Fellow
In partnership with Florida Southern College’s McKay Archives Center
Fall 2023

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Source:

Mack, Thomas B. History of the Citrus Institute, Florida Southern College, 1947-1993. Lakeland, Florida: Florida Southern College, 1993.

Exciting New Exhibition!

October 15th was an exciting day for the Florida Citrus Community. The Exhibition: Plant City and the Agriculture, Food Processing, and Supermarket Revolution; 1939 - 1975, opened to the public with a flourish. The exhibition dictates the changes in Plant City agriculture and has several unique exhibits. The exhibition has a lot of interesting information regarding all-things agriculture, specifically citrus distribution, scientific experimentation, and even how super markets came to be the way they are today. Sponsored by Publix Super Markets, this exhibition is running until November 4th, 2018.

Below is a photo from the ribbon cutting ceremony which took place on October 15th, 2018. In the background is the Florida Citrus Hall of Fame Exhibit and prominently displayed within this exhibit are numerous citrus crate labels.

If are interested in attending this exhibit, here is a link to the Plant City Chamber of Commerce website where you can find more information. Feel free to send us any photos you take while attending the event, and it just may get featured on our social media.

Written By: Emma Morton

Student Fellow at the Florida Citrus Hall of Fame

In partnership with Florida Southern College’s McKay Archives Center