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The ideal temperature to grow grass seed varies depending on the type of grass you want for your lawn. Cool-season grasses prefer when air temperatures are around 70 to 75 degrees Fahrenheit.
Growing degrees (GDs) is defined as the number of temperature degrees above a certain threshold base temperature, which varies among crop species. The base temperature is that temperature below which plant growth is zero. GDs are calculated each day as maximum temperature plus the minimum temperature divided by 2, minus the base temperature.
Germination without damage to the seed coat is low, but continues for a long time. [6] In addition to starting new plants, the stolon connections also communicate defense signals between connected plants about the removal of leaves by herbivores. [36] Because of its fine and dense root network it excellent for controlling erosion. [7]
It is a measure of germination time course and is usually expressed as a percentage, e.g., an 85% germination rate indicates that about 85 out of 100 seeds will probably germinate under proper conditions over the germination period given. Seed germination rate is determined by the seed genetic composition, morphological features and ...
It is known as an "emergency crop" because it is planted late in the season, when the temperatures are warmer, and most other crops have already been planted. [24] Teff germination generally occurs 3–12 days after sowing. Optimal germination temperatures range from 15 to 35 °C; below 10 °C, germination almost does not occur. [24]
Some seeds including cocklebur and amaranth germinate only at high temperatures (30C or 86F). Many plants that have seeds that germinate in early to mid summer have thermodormancy and germinate only when the soil temperature is warm. Other seeds need cool soils to germinate, while others like celery are inhibited when soil temperatures are too ...
Some species produce seeds that require special conditions to germinate, such as cold treatment. The seeds of many Australian plants and plants from southern Africa and the American west require smoke or fire to germinate. Some plant species, including many trees, do not produce seeds until they reach maturity, which may take many years. Seeds ...
It is possible to devernalize a plant by exposure to sometimes low and high temperatures subsequent to vernalization. For example, commercial onion growers store sets at low temperatures, but devernalize them before planting, because they want the plant's energy to go into enlarging its bulb (underground stem), not making flowers. [24]
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