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Planting Date Effects on Winter Triticale Dry Matter and Nitrogen Accumulation

^a Dep. of Agron., Iowa State Univ., Ames, IA 50011
^b USDA-ARS Natl. Soil Tilth Lab., Ames, IA 50011

View larger version (37K): [in a new window]   Fig. 1. Location effects on spring and summer dry matter accumulation, N concentration, and N removal of winter triticale in Iowa during two growing seasons. Growing degree days were calculated from 1 March using a base temperature of 4°C.

View larger version (40K): [in a new window]   Fig. 2. Planting date effects on spring and summer dry matter accumulation, N concentration, and N removal of winter triticale in Iowa during two growing seasons. Growing degree days were calculated from 1 March using a base temperature of 4°C.

View larger version (19K): [in a new window]   Fig. 3. Effect of planting date on relative dry matter yield of winter triticale grown over two growing seasons at three Iowa locations. Relative yields are based on mean final dry matter yield of the highest-yielding planting date within each location and growing season. Growing degree days were calculated beginning at planting. Critical level was obtained using the Cate–Nelson test to separate the data into two populations. Regression then fitted lines to the two populations.