The bluegrass variety and its yield potential in your location. The variety Argyle generally requires less N for optimum yields than other varieties. Total annual precipitation and other climatic factors. The age of the bluegrass seed. Estimated total nitrogen needed by a bluegrass seed crop based on variety and annual precipitation.
Soils vary in their capacities to release N from organic matter during the growing season.
The rate or amount of N released depends on factors such as amount of soil organic matter, soil erosion, available soil moisture and soil temperature during the growing season. Mineralizable N release rates for northern Idaho soils. Bluegrass grown for seed is capable of removing N to a depth of 2 feet or more. Plants use phosphorus most efficiently when it is incorporated into the seedbed before seeding because P is not mobile in soils. For established stands, P can be surface-applied in fall.