Effects of Light, Temperature, and Soil Depth on the Germination and Emergence of Conyza canadensis (L.) Cronq.
Abstract
:1. Introduction
2. Materials and Methods
2.1. Germination Tests
2.2. Emergence Tests
2.3. Statistical Analyses
2.4. Modeling Germination Rates as a Function of Temperature
3. Results
3.1. Germination Tests
3.2. Emergence Tests
3.3. Modeling Germination Rates as a Function of Temperature
4. Discussion
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
References
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Temp. | Light Regime (Light/Dark h.) | FGP | T30 (d) | ||
---|---|---|---|---|---|
2.5 | 12/12 | 0.00 (0.00) | a | >16 | - |
5 | 12/12 | 0.11 (0.02) | b | >16 | - |
10 | 12/12 | 0.54 (0.04) | cde | 6.92 (0.27) | a |
15 | 12/12 | 0.70 (0.04) | e | 2.54 (0.10) | c |
20 | 12/12 | 0.61 (0.04) | cde | 1.89 (0.09) | f |
25 | 12/12 | 0.60 (0.04) | cde | 1.49 (0.06) | g |
30 | 12/12 | 0.55 (0.04) | cde | 1.99 (0.08) | ef |
40 | 12/12 | 0.00 (0.00) | a | >16 | - |
12/18 | 12/12 | 0.49 (0.04) | cd | 2.94 (0.12) | b |
17/23 | 12/12 | 0.67 (0.04) | de | 1.55 (0.06) | g |
22/28 | 12/12 | 0.61 (0.04) | cde | 1.53 (0.07) | g |
15 | 0/24 | 0.53 (0.04) | cde | 3.24 (0.13) | b |
20 | 0/24 | 0.51 (0.04) | cd | 2.26 (0.09) | cd |
25 | 0/24 | 0.45 (0.04) | c | 2.17 (0.11) | de |
Depth (mm) | Temperature (°C) | Pre-Treatment | FGP | T30 (d) | ||||
---|---|---|---|---|---|---|---|---|
0 | 15 | NI | 0.34 | (0.03) | a | 11.7 | (2.58) | a |
2.5 | 15 | NI | 0.02 | (0.01) | cde | >16 | ||
5 | 15 | NI | 0.00 | (0.00) | c | >16 | ||
10 | 15 | NI | 0.00 | (0.00) | c | >16 | ||
0 | 20 | NI | 0.36 | (0.03) | ab | 8.4 | (1.48) | a |
2.5 | 20 | NI | 0.04 | (0.01) | def | >16 | ||
5 | 20 | NI | 0.00 | (0.00) | c | >16 | ||
10 | 20 | NI | 0.00 | (0.00) | c | >16 | ||
0 | 25 | NI | 0.40 | (0.03) | a | 4.7 | (1.04) | ab |
2.5 | 25 | NI | 0.07 | (0.01) | dfa | >16 | ||
5 | 25 | NI | 0.00 | (0.00) | c | >16 | ||
10 | 25 | NI | 0.00 | (0.00) | c | >16 | ||
0 | 15 | I | 0.25 | (0.02) | bh | >16 | ||
2.5 | 15 | I | 0.13 | (0.02) | g | >16 | ||
5 | 15 | I | 0.05 | (0.01) | def | >16 | ||
10 | 15 | I | 0.00 | (0.00) | c | >16 | ||
0 | 20 | I | 0.48 | (0.03) | a | 2.5 | (0.47) | b |
2.5 | 20 | I | 0.16 | (0.02) | gh | >16 | ||
5 | 20 | I | 0.08 | (0.01) | dfg | >16 | ||
10 | 20 | I | 0.00 | (0.00) | c | >16 | ||
0 | 25 | I | 0.47 | (0.03) | a | 1.8 | (0.56) | b |
2.5 | 25 | I | 0.10 | (0.02) | fg | >16 | ||
5 | 25 | I | 0.09 | (0.02) | fg | >16 | ||
10 | 25 | I | 0.01 | (0.01) | ce | >16 |
Percentile | Tb (°C) | ΘT (°C Day) | k | Tc (°C) | ||||
---|---|---|---|---|---|---|---|---|
10th | 6.67 | (0.53) | 20.24 | (1.57) | 0.23 | (0.06) | 33.90 | (0.82) |
20th | 6.67 | (0.53) | 21.69 | (1.81) | 0.23 | (0.06) | 33.33 | (0.70) |
30th | 6.67 | (0.53) | 22.82 | (2.00) | 0.23 | (0.06) | 32.95 | (0.62) |
40th | 6.67 | (0.53) | 24.03 | (2.22) | 0.23 | (0.06) | 32.55 | (0.54) |
50th | 6.67 | (0.53) | 24.32 | (2.72) | 0.23 | (0.06) | 30.71 | (0.22) |
Parameters | Estimate | SE |
---|---|---|
Tb | 6.81 | 0.54 |
θT(0) | 19.64 | 1.48 |
b1 | 0.073 | 0.037 |
k | 0.201 | 0.054 |
Tc(0) | 35.78 | 1.16 |
b2 | −0.094 | 0.021 |
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Ottavini, D.; Pannacci, E.; Onofri, A.; Tei, F.; Kryger Jensen, P. Effects of Light, Temperature, and Soil Depth on the Germination and Emergence of Conyza canadensis (L.) Cronq. Agronomy 2019, 9, 533. https://doi.org/10.3390/agronomy9090533
Ottavini D, Pannacci E, Onofri A, Tei F, Kryger Jensen P. Effects of Light, Temperature, and Soil Depth on the Germination and Emergence of Conyza canadensis (L.) Cronq. Agronomy. 2019; 9(9):533. https://doi.org/10.3390/agronomy9090533
Chicago/Turabian StyleOttavini, Daniele, Euro Pannacci, Andrea Onofri, Francesco Tei, and Peter Kryger Jensen. 2019. "Effects of Light, Temperature, and Soil Depth on the Germination and Emergence of Conyza canadensis (L.) Cronq." Agronomy 9, no. 9: 533. https://doi.org/10.3390/agronomy9090533