3 Fertility

Apply adequate lime to bring the pH to between 6.0 and 6.5. If a large amount of lime is needed, apply half before plowing and incorporate the remainder after plowing. Remember, asparagus will be in the field for eight to 12 years or longer, so reducing weed levels and supplying adequate nutrients prior to planting is essential. See Table 3.1 for the recommended rates of nitrogen, phosphorus, and potassium based on soil test results for your field. These levels are based on the total nutrient needs of the whole plant and assume the use of synthetic fertilizers. Research and grower experience suggests that somewhat lower levels may be adequate in organic systems. As many of the nutrients as possible should come from cover crop, manure, and compost additions in previous seasons. Refer to the Soil and Nutrient Management chapter to estimate nutrients.

Table 3.1 Recommended application rate of nutrients based on soil tests

Bed type	N pounds/acre	P2O5 pounds/acre			K2O pounds/acre
		Soil Phosphorus Level			Soil Potassium Level
		low	med	high	low	med	high
New plantings	50	110	60	30	150	100	50
Cutting beds	50	75	50	25	80	60	40