The effect of thermal time and soil water on emergence of Ranunculus repens |
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| Authors: | HARRIS DOOHAN GORDON & JENSEN |
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| Institution: | Nova Scotia Agricultural College, Department of Plant Science, Truro, NS, Canada, B2N 5E3; Nova Scotia Department of Agriculture and Marketing, Truro, NS, Canada, B2N 5E3; Agriculture and Agri-Food Canada, Atlantic Food and Horticulture Research Centre, Kentville, NS, Canada B4N 1J5 |
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| Abstract: | The effect of temperature and soil available water (AW) on the emergence of Ranunculus repens ?L. was examined in artificial media in growth chambers. Two seed populations, `arable type' and `wild type', were investigated. Moisture levels were 20%, 40%, 60% and 80% AW, and temperatures were 10/5 °C, 15/7 °C, 20/10 °C and 25/15 °C. Time to onset of emergence varied from 11 to 28 days for both seed populations, primarily as a result of mean temperature. Mean thermal time (TT) required for the onset of emergence of both populations was 251 ± 45 TT. Total emergence of the `arable type' R. repens varied from 3% at 10/5 °C and 20% AW to 30% at 25/15 °C and 60% AW. Total emergence of the `wild type' was greater, ranging from 4% at 10/5 °C and 20% AW to 57% at 25/15 °C and 80% AW. Temperature and AW significantly affected total emergence. A logistic response was displayed for the cumulative emergence of both populations. Seedling emergence models based on TT were developed for both populations at each of the four levels of AW. |
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