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Soybean Growth and Development Response to Rotation Sequence and Tillage System

^a Dep. of Agron., Iowa State Univ., 2104 Agronomy Hall, Ames, IA 50011
^b Dep. of Agron., Univ. of Wisconsin, 1575 Linden Dr., Moore Hall, Madison, WI 53706

View larger version (25K): [in a new window]   Fig. 1. Gravimetric soil moisture content from 0 to 30 cm in seven different rotation sequences (1-yr, 2-yr, 3-yr, 4-yr, and 5-yr = first-, second-, third-, fourth-, and fifth-year soybean, respectively; S/C = first-year soybean, alternated annually with corn; Cont. = continuous soybean since the experiment was started in 1983) during (A) 2000 and (C) 2001 and in two tillage systems [no-tillage (NT) and conventional tillage (CT)] during the (B) 2000 and (D) 2001 growing seasons. Vertical bars represent the LSD (P 0.05) on dates when significant differences were found.

View larger version (22K): [in a new window]   Fig. 2. Dry matter (DM) accumulation per plant in seven different rotation sequences (1-yr, 2-yr, 3-yr, 4-yr, and 5-yr = first-, second-, third-, fourth-, and fifth-year soybean, respectively; S/C = first-year soybean, alternated annually with corn; Cont. = continuous soybean since the experiment was started in 1983) during (A) 2000 and (C) 2001 and in two tillage systems [no-tillage (NT) and conventional tillage (CT)] during the (B) 2000 and (D) 2001 growing seasons. Vertical bars represent the LSD (P 0.05) on dates when significant differences were found.

View larger version (21K): [in a new window]   Fig. 3. Number of nodes on the main stem in seven different rotation sequences (1-yr, 2-yr, 3-yr, 4-yr, and 5-yr = first-, second-, third-, fourth-, and fifth-year soybean, respectively; S/C = first-year soybean, alternated annually with corn; Cont. = continuous soybean since the experiment was started in 1983) during (A) 2000 and (C) 2001 and in two tillage systems [no-tillage (NT) and conventional tillage (CT)] during the (B) 2000 and (D) 2001 growing seasons. Vertical bars represent the LSD (P 0.05) on dates when significant differences were found.

View larger version (23K): [in a new window]   Fig. 4. Plant height in seven different rotation sequences (1-yr, 2-yr, 3-yr, 4-yr, and 5-yr = first-, second-, third-, fourth-, and fifth-year soybean, respectively; S/C = first-year soybean, alternated annually with corn; Cont. = continuous soybean since the experiment was started in 1983) during (A) 2000 and (C) 2001 and in two tillage systems [no-tillage (NT) and conventional tillage (CT)] during the (B) 2000 and (D) 2001 growing seasons. Vertical bars represent the LSD (P 0.05) on dates when significant differences were found.

View larger version (22K): [in a new window]   Fig. 5. Leaf area index (LAI) in seven different rotation sequences (1-yr, 2-yr, 3-yr, 4-yr, and 5-yr = first-, second-, third-, fourth-, and fifth-year soybean, respectively; S/C = first-year soybean, alternated annually with corn; Cont. = continuous soybean since the experiment was started in 1983) during (A) 2000 and (C) 2001 and in two tillage systems [no-tillage (NT) and conventional tillage (CT)] during the (B) 2000 and (D) 2001 growing seasons. Vertical bars represent the LSD (P 0.05) on dates when significant differences were found.