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Published online 31 January 2005
Published in Crop Sci 45:494-502 (2005)
© 2005 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Release of Seed Dormancy in Field Plantings of Eastern Gamagrass

Lance R. Gibson*, Ezra Z. Aberle, Allen D. Knapp, Kenneth J. Moore and Roger Hintz

Dep. of Agronomy, Iowa State Univ., Ames, IA 50011


Figure 1
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  		Fig. 1. Monthly average precipitation from August 1999 to June 2002 for the Iowa State University Agronomy/Agricultural and Biosystems Engineering Farm near Ames, IA.

 

Figure 2
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  		Fig. 2. Monthly mean temperature from August 1999 to June 2002 for the Iowa State University Agronomy/Agricultural and Biosystems Engineering Farm near Ames, IA.

 

Figure 3
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  		Fig. 3. Plant emergence from 50 seeds of eastern gamagrass planted at various dates and retrieved 3, 6, 9, and 12 mo after planting. Seed was either wet stratified at 4°C for 6 wk or unstratified before planting. Letters indicate statistical significance for the main effects of retrieval date. Plant emergence from retrieval dates with the same letter did not differ at P ≤ 0.05 according to Tukey's test. When interactions of stratification treatment with retrieval date were significant, significance of stratification treatment at each retrieval date was determined with Tukey's test. *, **, *** indicate differences between stratification treatments for a retrieval date at P ≤ 0.05, 0.01, and 0.001 levels, respectively. Separate lines for stratified and unstratified seed with no denotation of significance for individual retrieval dates represents significant (P ≥ 0.05) main effects of stratification treatment. A single line for a planting date indicates that stratification treatment and interactions of stratification with retrieval date were not significant.

 

Figure 4
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  		Fig. 4. Germinating seeds retrieved at 3, 6, 9, and 12 mo after planting 50 eastern gamagrass seeds at various dates. Seed was either wet stratified at 4°C for 6 wk or unstratified before planting. Letters indicate statistical significance for the main effects of retrieval date. Seed germination from retrieval dates with the same letter did not differ at P ≤ 0.05 according to Tukey's test. When interactions of stratification treatment with retrieval date were significant, significance of stratification treatment at each retrieval date was determined with Tukey's test. *, **, *** indicate differences between stratification treatments for a retrieval date at P ≤ 0.05, 0.01, and 0.001 levels, respectively. Separate lines for stratified and unstratified seed with no denotation of significance for individual retrieval dates represents significant (P ≥ 0.05) main effects of stratification treatment. A single line for a planting date indicates that stratification treatment and interactions of stratification with retrieval date were not significant.

 

Figure 5
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  		Fig. 5. Dormant seeds remaining after a 28 d germination test for seed retrieved at 3, 6, 9, and 12 mo after planting of 50 eastern gamagrass seeds at various dates. Seed was either wet stratified at 4°C for 6 wk or unstratified before planting. Letters indicate statistical significance for the main effects of retrieval date. The number of viable seeds from retrieval dates with the same letter did not differ at P ≤ 0.05 according to Tukey's test. When interactions of stratification treatment with retrieval date were significant, significance of stratification treatment at each retrieval date was determined with Tukey's test. *, **, *** indicate differences between stratification treatments for a retrieval date at P ≤ 0.05, 0.01, and 0.001 levels, respectively. Separate lines for stratified and unstratified seed with no denotation of significance for individual retrieval dates represents significant (P ≥ 0.05) main effects of stratification treatment. A single line for a planting date indicates that stratification treatment and interactions of stratification with retrieval date were not significant.

 




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