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Manure Management Effects on Grass Production, Nutritive Content, and Soil Nitrogen for a Grass Silage–Based Dairy Farm

^a Department of Animal Sciences, Washington State University, 7612 Pioneer Way East, Puyallup, WA 98371
^b Department of Biological Systems Engineering, Washington State University, Smith Hall, Pullman, WA 99164-6120
^c Bueler Dairy Farm, 8626 Lowell Larimer Road, Snohomish, WA 98296
^d Dari-Tech Services, 11730 SE 277th Place, Kent, WA 98031

View larger version (28K): [in a new window]   Fig. 1. Soil N availability, soil nitrate, and forage total N of grass treated with (a) one application of manure after each cutting, Field 1a in 2001 (old seeding); (b) two applications of manure, three times, Field 1b in 2001 (old seeding); and (c) two applications of manure, four times, Field 1c in 2001 (old seeding).

View larger version (27K): [in a new window]   Fig. 2. Soil N availability, soil nitrate, and forage total N of grass treated with one application of manure after each cutting in Fields (a) 4 and (b) 5 during 2001 (new seeding).

View larger version (26K): [in a new window]   Fig. 3. Grass nitrate N over time in Field 4 during 2001 (new seeding).

View larger version (30K): [in a new window]   Fig. 4. Crude protein (CP) concentration versus nitrate N levels for all grass samples in (a) 2001 and (b) 2002 separated by new- and old-seeding grass.

View larger version (23K): [in a new window]   Fig. 5. Soil nitrate N concentration in new seeding and old-seeding grass in 2002 for Fields 1a and 2.