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Method and Timing of Rye Control Affects Soybean Development and Resource Utilization

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

View larger version (40K): [in a new window]   Fig. 1. Daily air temperature and precipitation near Boone, IA, in 2002 and 2003. Long-term average is from 1951–2002.

View larger version (28K): [in a new window]   Fig. 2. Gravimetric soil water content in chemical and mechanical rye control at three growth stages and a no-rye check from the 0- to 15- and 15- to 30-cm soil depths at different sampling dates in 2002. Vertical error bars represent LSD value at = 0.05.

View larger version (27K): [in a new window]   Fig. 3. Light interception in chemical and mechanical rye control at three growth stages and a no-rye check at different sampling dates in 2002 and 2003. Vertical error bars represent LSD value at = 0.05.

View larger version (38K): [in a new window]   Fig. 4. Soybean main-stem node development in chemical and mechanical rye control at three growth stages and a no-rye check at different sampling dates in 2002 and 2003. Vertical error bars represent LSD value at = 0.05.

View larger version (24K): [in a new window]   Fig. 5. Soybean plant height in chemical and mechanical rye control at three growth stages and a no-rye check at different sampling dates in 2002 and 2003. Vertical error bars represent LSD value at = 0.05.

View larger version (19K): [in a new window]   Fig. 6. Soybean dry matter accumulation in chemical and mechanical rye control at three growth stages and a no-rye check at different sampling dates in 2002. Vertical error bars represent LSD value at = 0.05.

View larger version (17K): [in a new window]   Fig. 7. Soybean dry matter accumulation, averaged across method of control, at three growth stages and a no-rye check at different sampling dates in 2003. Vertical error bars represent LSD value at = 0.05.