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Alfalfa and Reed Canarygrass Response to Midsummer Manure Application

^a USDA-ARS Plant Science Research Unit and Dep. of Agronomy and Plant Genetics, Univ. of Minnesota, 411 Borlaug Hall, 1991 Upper Buford Circle, Saint Paul, MN 55108
^b USDA-ARS-PRSU and US Dairy Forage Research Center (Minnesota Cluster), 1991 Upper Buford Circle, Room 439, Saint Paul, MN 55108
^c Dep. of Soil, Water and Climate, Univ. of Minnesota, 1991 Upper Buford Circle, Room 439, Saint Paul, MN 55108

View larger version (32K): [in a new window]   Fig. 1. Third harvest yield response to midsummer swine manure slurry applications for each entry in each location and year in the rate experiment. Ineffective Agate third harvest yield increased linearly with increasing manure rates at Rosemount in 1998 (y = 1.47 + 0.02x, P 0.0001) and in 1999 (y = 0.36 + 0.01x, P 0.0001), but demonstrated a quadratic response to increasing manure rates in 1998 at Waseca (y = 2.84 + 0.02x – 0.0003x2, P 0.02). Reed canarygrass third harvest yield increased linearly with increasing manure rates at Rosemount in 1998 (y = 1.21 + 0.02x, P 0.0001) and in 1999 (y = 0.22 + 0.01x, P 0.0001), but demonstrated a quadratic response to increasing manure rates at Waseca in 1998 (y = 2.52 + 0.02x – 0.0003x2, P 0.03) and 1999 (y = 1.58 + 0.03x – 0.0003x2, P 0.0001). At Waseca, third harvest yield declined with increasing manure rates for both of the N2–fixing alfalfas: UMN 3097 (1998, y = 3.63 – 0.01x, P 0.0001; 1999, y = 2.18 – 0.01x, P 0.0001) and Agate: (1998, y = 3.43 – 0.01x, P 0.003; 1999, y = 1.10 – 0.01x, P 0.0001).

View larger version (32K): [in a new window]   Fig. 2. Stand score response to midsummer swine manure slurry applications for each entry in each location and year in the rate experiment. Ineffective Agate stand score increased with increasing manure rates at Rosemount in 1998 (y = 57 + 0.13x, P 0.02) and at Waseca in 1999 (y = 25 + 0.23x, P 0.001). UMN 3097 stand score declined with increasing manure rates at Waseca in 1998 (y = 94 – 0.15x, P 0.0001) and in 1999 (y = 81 – 0.08x, P 0.03). Agate stand score declined with increasing manure rates only at Waseca in 1998 (y = 92 – 0.13x, P 0.001).

View larger version (26K): [in a new window]   Fig. 3. Total yield response to midsummer swine manure slurry applications for each entry in the rate experiment for two years at Rosemount and Waseca, MN. Total yield for reed canarygrass increased with increasing manure rates at Rosemount (y = 7.98 + 0.04x, P 0.01) and Waseca (y = 13.3 + 0.03x, P 0.01). Total yield for UMN 3097 (y = 17.3 – 0.01x, P 0.03) and Agate (y = 16.8 – 0.02x, P 0.02) declined with increasing manure rates only at Waseca.

View larger version (26K): [in a new window]   Fig. 4. Third harvest yield response to manure solids rate in midsummer swine manure slurry application to N2–fixing alfalfas, non-N2–fixing Ineffective Agate alfalfa, and reed canarygrass. Yields are expressed on a relative basis within each entry-site-year combination in both the rate and cultivar experiments. Ignoring plots that had not attained maximum yield because of insufficient manure-N supply (solid symbols), there was no effect of solids on relative yield (y = 0.97) until application rate exceeded about 3300 kg solids ha–1, after which relative yield declined linearly (y = 1.09 – 0.000037x for x > 3300 kg ha–1, R2 = 0.73, n = 112).