Garlic - Fertility

Nitrogen

If manure is applied or legume sod is plowed down, reduce the nitrogen (N) application. See Table 1-8, Adjustment of Nitrogen Requirement Where Sod Containing Legumes Is Plowed Down, and Table 1-7, Average Amounts of Available Nutrients for Different Types of Manure, on page 9.

On mineral soils, a total of 110 kg N/ha (99 lb/ac) is required. Apply half the nitrogen as soon as the garlic plants begin to grow in the spring. Apply the rest of the nitrogen in 2-3 side-dresses at 3-week intervals.

On muck soils, apply a total of 120 kg N/ha (107 lb/ac). Apply 90 kg/ha (80 lb/ac) prior to spring growth and the remainer as a side-dress applications when the plants are 8-10 cm (3-4 in.) tall.

Phosphorus

Phosphorus requirements for garlic are similar to onions. Where the soil test values are 61 mg P per L soil (ppm) or higher, onions and garlic are unlikely to respond to additional phosphate applications. For soils testing lower than 61 mg P per L soil (ppm), see Table 1-10, Phosphorus Requirements: Vegetables on Mineral Soils, on page 12, or Table 1-11, Phosphorus and Potassium Requirements: Vegetables on Muck Soils, on page 13.

Potassium

Potassium requirements for garlic are similar to onions. Where the soil test values are 181 mg K per L soil (ppm) or higher, onions and garlic are unlikely to respond to additional potash applications. For soils testing lower than 181 mg K per L soil (ppm), see Table 1-12, Potassium Requirements: Vegetables on Mineral Soils, on page 14, or Table 1-11, Phosphorus and Potassium Requirements: Vegetables on Muck Soils, on page 13.

Related Links

• Publication 363 - Vegetable Production Recommendations

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