Onions (plantbed) (Code #169)
Soil Test RatingPotassium

Low K

Coast: 0-70 lbs/A

Pied: 0-120 lbs/A

Medium K

Coast: 71-170 lbs/A

Pied: 121-250 lbs/A

High K

Coast: 171-275 lbs/A

Pied: 251-400 lbs/A

Very High K

Coast: 275+ lbs/A

Pied: 400+ lbs/A

PhosphorusRecommended Pounds N-P205-K20 per Acre

Low P

Coast: 0-30 lbs/A

Pied: 0-20 lbs/A

*-120-120*-120-90*-120-60*-120-45

Medium P

Coast: 31-60 lbs/A

Pied: 21-40 lbs/A

*-80-120*-80-90*-80-60*-80-45

High P

Coast: 61-100 lbs/A

Pied: 41-75 lbs/A

*-40-120*-40-90*-40-60*-40-45

Very High P

Coast: 100+ lbs/A

Pied: 75+ lbs/A

*-0-120*-0-90*-0-60*-0-45

Coast = Coastal Plain    Pied = Piedmont, Mountain, and Limestone Valley

Recommendations:

Recommended pH:6.0 to 6.5. If the pH is less than 6.0, see Lime Table B.
Nitrogen:Coastal Plain 100-130 pounds nitrogen (N) per acre.

Piedmont, Mountain, Limestone Valley 90-120 pounds nitrogen (N) per acre.

Magnesium:

If soil test Mg level is low and lime is recommended, use dolomitic limestone; if soil test Mg is low and lime is not recommended, apply 25 pounds of Mg/Acre.

Coastal PlainLow: 0 - 60 lbs/acre Medium: 61 - 120 lbs/acre High: >120 lbs/acre
Piedmont Low: 0 - 120 lbs/acre Medium: 121 - 240 lbs/acre High: >240 lbs/acre
Zinc:If the Zn soil test level is low, apply 5 pounds of zinc per acre.
Sulfur:Apply 10 pounds of sulfur (S) per acre preplant on Coastal Plain soils.
Boron:Apply 1 pound of boron (B) per acre. This application should be split into two applications.

Fact Sheet:

Nitrogen (N) rates will vary depending on rainfall, soil type, irrigation, and method and timing of applications.

For more efficient use of fertilizer split the applications, applying one-third to one-half down (banded or incorporated in the bed) and the remainder in 1 to 3 applications. If the fertilizer is broadcast, increase the application rates of P2O5 and K2O 1½ to 2 times.

Apply 10 pounds of sulfur (S) per acre preplant on Coastal Plain soils.

Apply 1 pound of boron (B) per acre. This application should be split into two applications.