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    Aspire®: Impact on Potassium Uptake (Greenhouse Trial) – AgriFacts

    11.2%

    Increased K uptake when providing K nutrition with Aspire and adequate N.:

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    Objective

    Quantify the impact of Aspire® (0-0-58-0.5B) on potassium (K) uptake and plant growth in corn when applied with low vs. high nitrogen (N) rates.

    OVERVIEW

    • Adequate levels of K and N can aid in nutrient uptake and optimize nutrient recovery.
    • Optimizing Nitrogen Use Efficiency (NUE) relies on potassium ions (K+) to balance the negative charge of nitrate (NO3 -) as it is taken up by roots and distributed throughout the corn plant.
    • Aspire is an innovative K fertilizer that uses Nutriform® technology to combine potassium along with two forms of boron (B) (fast and slow release) for optimal nutrient delivery and distribution.

    TRIAL DETAILS

    CROP: Corn (Zea mays)
    YEAR: 2023
    LOCATION: Sabanci University, Turkey
    DATA SOURCE: Dr. Ismail Cakmak

    EXPERIMENTAL DESIGN: Pot trials conducted under greenhouse conditions and averaged across two soil types.

    • Loam (7.8 pH, 244 ppm K, 0.1 ppm B)
    • Clay (4.6 pH, 81 ppm K, 0.4 ppm B)
    • Fertilizer applied representing a low and high nitrogen rate

    Treatments:

    • Low N, no K
    • High N, no K
    • Low N, Aspire
    • High N, Aspire

    Study Details:

    • Fertilizers were homogeneously mixed with soil, simulating broadcast and incorporated applications.
    • Above ground dry matter and nutrient uptake was determined 37 days after planting.

    SUMMARY

    • Corn potassium uptake increased 10 mg/plant (11.2%) when nitrogen application rates were increased to sufficient levels with Aspire, but only 5.5 mg/plant when no K was applied.
    • Plant dry matter increased 22% (0.91 g/plant) with Aspire when N rate increased from low to high, compared to only an 11% (0.41 g/plant) increase when N rates were increased from low to high with no K.
    • Potassium nutrition with Aspire is needed as part of a balanced crop nutrition program to optimize N applications, plant dry matter production, and K uptake.