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Fertilizers. Fertilizers What are the numbers?What are the numbers? –N, P 2 O 5, K 2 O –“primary” macronutrients Nutrients derived from…Nutrients derived.

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Presentation on theme: "Fertilizers. Fertilizers What are the numbers?What are the numbers? –N, P 2 O 5, K 2 O –“primary” macronutrients Nutrients derived from…Nutrients derived."— Presentation transcript:

1 Fertilizers

2 Fertilizers What are the numbers?What are the numbers? –N, P 2 O 5, K 2 O –“primary” macronutrients Nutrients derived from…Nutrients derived from…

3 Fertilizers Secondary macronutrientsSecondary macronutrients MicronutrientsMicronutrients

4 Nitrogen breakdownNitrogen breakdown

5 Organic fertilizersOrganic fertilizers –Kelp meal

6 Organic fertilizersOrganic fertilizers –Feather Meal to (different suppliers) –Slow release!

7 Organic fertilizersOrganic fertilizers –Green sand 0-0-3

8

9

10 lbs/acre ÷ = oz/1,000 ft 2

11 Application Strategy Soil Test ResponseSoil Test Response –Preplant Adjustments pH (liming) 100%pH (liming) 100% –Dolomitic limestone (CaMg)(CO 3 ) 2 –Calcitic limestone CaCO 3 Calcium (Ca) / Magnesium (Mg) 100%Calcium (Ca) / Magnesium (Mg) 100% –If pH is ok & Ca needed: gypsum CaSO 4 2H 2 O –If pH is ok & Mg needed: Epsom salt MgSO 4 7H 2 O Phosphorus (P 2 O 5 ) 100%Phosphorus (P 2 O 5 ) 100% Potassium (K 2 O) 30 to 50% (unless slow-release)Potassium (K 2 O) 30 to 50% (unless slow-release) Nitrogen (N) 30 to 50% (unless slow-release)Nitrogen (N) 30 to 50% (unless slow-release) Sulfur (S) – Epsom salt or other sulfate fertilizer 100%Sulfur (S) – Epsom salt or other sulfate fertilizer 100% –Micronutrients (B, Cl, Cu, Fe, Mn, Mo, Zn)? Usually not in soil test unless requested (UGA does Zn and Mn in routine tests); usually not deficientUsually not in soil test unless requested (UGA does Zn and Mn in routine tests); usually not deficient

12 Application Strategy Soil Test ResponseSoil Test Response –Postplant Adjustments Potassium (K 2 O) 50 to 70% as sidedress (as-needed for SRF)Potassium (K 2 O) 50 to 70% as sidedress (as-needed for SRF)sidedress Nitrogen (N) 50 to 70% as sidedress (as-needed for SRF)Nitrogen (N) 50 to 70% as sidedress (as-needed for SRF)


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