sap analysis - university of florida

SAP ANALYSIS:It’s All About The Inventory

Presenter: Jeff Glass

Business Development Manager

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Agro-K has been working with sap

analysis since 2016 – during the last 30

months I have analyzed over 200 sap

samples in Florida, most of which have

been with citrus.

Today’s topics:

• A well-balanced citrus grove

• Sap vs Tissue – tomato example

• Long term grove sap analysis

• A recent comparison with Zn & Mn

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Nutrient Demands Are Not A Flat Line

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GGGGGGGGGGGGGGGLooks great on paper, but what about the grove?

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A well-balanced grove is the ultimate

goal. Citrus trees must have a stocked

warehouse (soil), the proper equipment

(leaf tissue), and sufficient inventory

(sap) to maintain nutritional balance.

The Results Support the Sap Report:

• Solid flushes, large leaves

• Great color

• Nice fruit set & retention

Tissue Test vs.

Sap Analysis

Tomato:

During Bloom

Ca K Mn

Tissue Sap: Young Leaves Sap: Old Leaves

Excessive

Optimum

Deficient

December 6, 2018

1 pint/A for

3 weeks1 pint/A for

3 weeks

Ca K Mn

Tissue Sap: Young Leaves Sap: Old Leaves

Tissue Test vs.

Sap Analysis

Tomato:

After Ca & Mn

Applications

Excessive

Optimum

Deficient

January 31, 2019

Long Term

Citrus

Evaluation:

Grower

Standard vs.

Sap Managed

• Two 100+ acre Valencia blocks

• No micro-irrigation

• One grower standard block

• One sap managed block

• Only differences are foliar nutritional apps

• Project began in December of 2018

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Dec '18 Jan '19 Mar '19 Apr '19 May '19 Jun '19 Jul '19 Aug '19 Oct '19 Dec '19 Jan '20 Mar '20

POTASSIUM PPM

Grower Standard Young Leaves Grower Standard Old Leaves

Sap Managed Young Leaves Sap Managed Old Leaves

Sap Analysis: Potassium Levels in Young and Old ‘Valencia’ LeavesFlorida: December 2018 - March 2020

Dotted Line = Grower StandardSolid Line = Sap Managed

Sap Managed = +95 lb solids/Acre

Sap Analysis: Calcium Levels in Young and Old ‘Valencia’ LeavesFlorida: December 2018 - March 2020

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CALCIUM PPM



Dotted Line = Grower Standard

Solid Line = Sap Managed


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SODIUM PPM

Grower Standard Young Leaves Grower Standard Old LeavesSap Managed Young Leaves Sap Managed Old Leaves

Sap Analysis: Sodium Levels in Young and Old ‘Valencia’ LeavesFlorida: December 2018 - March 2020




Sap Analysis: Nitrogen Levels in Young and Old ‘Valencia’ LeavesFlorida: December 2018 - March 2020

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Dec '18 Jan '19 Mar '19 Apr '19 May '19 Jun '19 July '19 Aug '19 Oct '19 Dec '19 Jan '20 Mar '20

NITROGEN PPM






Sap Analysis: Molybdenum Levels in Young and Old ‘Valencia’ LeavesFlorida: December 2018 - March 2020

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MOLYBDENUM PPM

Grower Standard Young Leaves Grower Standard Old LeavesSap Managed Young Leaves Sap Managed Old Leaves




2021 Sap Managed Block: Applications of Zn and Mn

Two Valencia blocks – grower standard and Sap managed

• Before and after sap analysis (January & March)

• 1 quart of Zn phosphite per acre

• 1 quart of Mn phosphite per acre

• Focus – Zn, Mn, K and Ca

Note: Optimum ranges are modified based on research and data

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+15%

+29%

Grower Standard Block

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+355%

+586%

Sap Managed Block

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-2%

+9%


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+373%+334%

Sap Managed Block

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-21%

-13%


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-58% -64%

Sap Managed Block

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+3%

-18%


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+55%

+64%

Sap Managed Block

Sap Analysis: The Key To Inventory Balance

Real-time analysis

of inventory; have

the ability to make

adjustments

Sap analysis reports

the inventory status

of 21+ plant

nutrition indicators

Balance plant

nutrient inventories

to maximize yield &

bottom line

“The Science-Driven

Approach to Plant

Nutrition”

sap analysis - university of florida

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