Fertilizers

AGRI LEEDS

Essential nutrients

• Macronutrients (large quantities):• Nitrogen, Phosphorus• Potassium, Sulfur• Carbon, calcium, magnesium• Micronutrients (small quantities):• Zinc, iron• Copper, manganese• Chlorine, molybdenum, boron etc

Sources of nutrients

• Inorganic fertilizers (Chemical Fertilizers)

• Organic Fertilizers… Manures, composts, and other organic Materials.

• Green manures (legumes and others)

Fertilizer label and “grade”

• N.P.K• 3 numbersal ways appear on the label• Numbers refer to:% Nitrogen (N ) % Phosphorus (P2O5)

% Potassium ( K2o )

A few N-P-K labels out there

• 24-6-12• 16-4-8• 16-16-16• 12-12-12• 22-4-11• 22-4-14• 20-27-5• 18-5-9• 5-10-10• 9-17-9

• 34-0-0• 21-0-0• 29-3-4• 26-3-3• 28-4-4• 25-3-5• 20-2-4• 26-3-3• 25-3-5• 32-3-5

Methods of application

• Broadcast – evenly distributed on surface

• Banding – applied in a narrow band on surface or in a furrow opened adjacent to plant row

• Foliar – applied in liquid form through Spray

• Ferttigation -- dissolve and mix in a tank a apply through Ferttegated water

Soil pH

Soil pH

• Soil pH: the degree of acidity or

alkalinity of soil

• The pH scale:

2 7 12

Acidic Neutral Alkaline

Soil pH and nutrient availability

Foliar sprays

• Spray solutions directly onto leaves

• Rapid response, but you must have

complete coverage

• May require several applications

throughout the season as new leaves emerge

Corn: the indicator plant

Nitrogen deficiency

Phosphorus deficiency

Potassium deficiency

Iron deficiency

Zinc deficiency

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Questions

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