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Analysis of High Yielding, Early-Planted Soybean in Indiana

^a Dep. of Agronomy, Purdue Univ., 915 West State St., West Lafayette, IN 47907-2054
^b Dep. of Agronomy, 1575 Linden Drive, Univ. of Wisconsin, Madison, WI 53706

View larger version (45K): [in this window] [in a new window]   Fig. 1. Daily average air temperature, precipitation, and cumulative precipitation during the 2006 soybean growing seasons, and gravimetric soil moisture for six planting dates (PD) during the growing season. Gravimetric soil moisture was measured at 0 to 5, 5 to 10, and 10 to 20 cm from planting to physiological maturity. Field capacity (FC) and permanent wilt point (PWP) are shown on each graph. Growth stages are provided for each cultivar for each planting date. The top row is Becks 367NRR (Maturity Group 3.7), middle row is Becks 321NRR (Maturity Group 3.2), and bottom row is Pioneer 92M61 (Maturity Group 2.6). The vegetative growth stages were similar among cultivars and were averaged.

View larger version (67K): [in this window] [in a new window]   Fig. 2. Daily average air temperature, precipitation, and cumulative precipitation during the 2007 soybean growing seasons, and gravimetric soil moisture for six planting dates (PD) during the growing season. Gravimetric soil moisture was measured at 0 to 5, 5 to 10, and 10 to 20 cm from planting to physiological maturity. Field capacity (FC) and permanent wilt point (PWP) are shown on each graph. Growth stages are provided for each cultivar for each planting date. The top row is Becks 367NRR (Maturity Group 3.7), middle row is Becks 321NRR (Maturity Group 3.2), and bottom row is Pioneer 92M61 (Maturity Group 2.6). The vegetative growth stages were similar among cultivars and were averaged.

View larger version (34K): [in this window] [in a new window]   Fig. 3. Regression of yield (Mg ha–1) on planting date (day of year) for three soybean cultivars during 2006 and 2007. Cultivars were Pioneer brand 92M61 (P92) (Maturity Group 2.6), Becks brand 321NRR (B321) (Maturity Group 3.2), and Becks brand 367NRR (B367) (Maturity Group 3.7). Regression models were developed based on significant orthogonal polynomial contrasts, or as linear-plateau models when means for early planting dates were not different within a cultivar. Error bars represent the least significant difference for comparing cultivar means within each planting date, P 0.05.

View larger version (30K): [in this window] [in a new window]   Fig. 4. Regression of pods m–2 (no.) on planting date for three cultivars during 2006 and 2007. Cultivars were Pioneer brand 92M61 (P92) (Maturity Group 2.6), Becks brand 321NRR (B321) (Maturity Group 3.2), and Becks brand 367NRR (B367) (Maturity Group 3.7). Regression models were developed based on significant orthogonal polynomial contrasts. Error bars represent the least significant difference for comparing cultivar means within each planting date, P 0.05.

View larger version (28K): [in this window] [in a new window]   Fig. 5. Regression of seed mass (g 100 seeds–1) on planting date for three cultivars during 2006 and 2007. Cultivars were Pioneer brand 92M61 (P92) (Maturity Group 2.6), Becks brand 321NRR (B321) (Maturity Group 3.2), and Becks brand 367NRR (B367) (Maturity Group 3.7). Regression models were developed based on significant orthogonal polynomial contrasts. Error bars represent the least significant difference for comparing cultivar means within each planting date, P 0.05.

View larger version (34K): [in this window] [in a new window]   Fig. 6. Regression of main stem nodes m–2 (no.) on planting date for three cultivars during 2006 and 2007. Cultivars were Pioneer brand 92M61 (P92) (Maturity Group 2.6), Becks brand 321NRR (B321) (Maturity Group 3.2), and Becks brand 367NRR (B367) (Maturity Group 3.7). Regression models were developed based on significant orthogonal polynomial contrasts. Error bars represent the least significant difference for comparing cultivar means within each planting date, P 0.05.

View larger version (29K): [in this window] [in a new window]   Fig. 7. Regression of oil (g kg–1) on planting date for three cultivars during 2006 and 2007. Cultivars were Pioneer brand 92M61 (P92) (Maturity Group 2.6), Becks brand 321NRR (B321) (Maturity Group 3.2), and Becks brand 367NRR (B367) (Maturity Group 3.7). Regression models were developed based on significant orthogonal polynomial contrasts. Error bars represent the least significant difference for comparing cultivar means within each planting date, P 0.05.

View larger version (30K): [in this window] [in a new window]   Fig. 8. Regression of protein (g kg–1) on planting date for three cultivars during 2006 and 2007. Cultivars were Pioneer brand 92M61 (P92) (Maturity Group 2.6), Becks brand 321NRR (B321) (Maturity Group 3.2), and Becks brand 367NRR (B367) (Maturity Group 3.7). Regression models were developed based on significant orthogonal polynomial contrasts. Error bars represent the least significant difference for comparing cultivar means within each planting date, P 0.05.

View larger version (27K): [in this window] [in a new window]   Fig. 9. Relationship between protein concentration and oil concentration and mean daily maximum temperature (°C) during R6. Cultivars were Pioneer brand 92M61 (P92) (Maturity Group 2.6), Becks brand 321NRR (B321) (Maturity Group 3.2), and Becks brand 367NRR (B367) (Maturity Group 3.7), years were combined (n = 36).