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Straw Production and Grain Yield Relationships in Winter Wheat

Dep. of Crop and Soil Sciences, Washington State Univ., 201 Johnson Hall, Pullman, WA 99164-6420

View larger version (33K): [in a new window]   Fig. 1. Soil water distribution in fallow in late summer during 3 yr at Lind, Washington. (A) Total soil profile (0–180 cm) water in August 1994, 1995, and 1996. Available water for winter wheat in the total profile after a year of fallow was 5.5, 11.5, and 9.5 cm in 1994, 1995, and 1996, respectively. (B) Seed–zone (0–22 cm) water and sowing depth on six sowing dates in August and September in 1994, 1995, and 1996

View larger version (71K): [in a new window]   Fig. 2. Straw production, harvest index, grain yield, and yield components, at Lind, WA, as influenced by sowing rate averaged across four winter wheat cultivars and 3 yr. Within-month means followed by the same letter are not significantly different at P < 0.05

View larger version (69K): [in a new window]   Fig. 3. Straw production, harvest index, grain yield, and yield components in 1995, 1996, and 1997 at Lind, WA, as influenced by sowing rate averaged across four winter wheat cultivars and three sowing dates. Within-year means followed by the same letter are not significantly different at P < 0.05

View larger version (70K): [in a new window]   Fig. 4. Straw production, harvest index, grain yield, and yield components in 1995, 1996, and 1997, as influenced by sowing date averaged across four winter wheat cultivars and three sowing rates. Within-year means followed by the same letter are not significantly different at P < 0.05

View larger version (80K): [in a new window]   Fig. 5. Straw production, harvest index, grain yield, and yield components of four winter wheat cultivars sown in August, September, and October, averaged across three sowing rates and three years. Within-month means followed by the same letter are not significantly different at P < 0.05

View larger version (79K): [in a new window]   Fig. 6. Straw production, harvest index, grain yield, and yield components of four winter wheat cultivars in 1995, 1996, and 1997, averaged across three sowing rates and three sowing dates. Within-year means followed by the same letter are not significantly different at P < 0.05

View larger version (11K): [in a new window]   Fig. 7. Path coefficient analysis of grain yield and yield components for four winter wheat cultivars grown during 3 yr at three sowing rates and three sowing dates at Lind, WA