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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.
0: Germination 00: Dry seed 01: Beginning of seed imbibition 03: Seed imbibition complete 05: Radicle emerged from seed 07: Hypocotyl with cotyledons breaking through seed coat 09: Emergence: cotyledons break through soil surface 1: Leaf development (Main shoot) 10: Cotyledons completely unfolded; growing point or true leaf initial visible 11
Most common annual vegetables have optimal germination temperatures between 75–90 F (24–32 C), though many species (e.g. radishes or spinach) can germinate at significantly lower temperatures, as low as 40 F (4 C), thus allowing them to be grown from seeds in cooler climates. Suboptimal temperatures lead to lower success rates and longer ...
Image Credit: 123RF. Not all seeds sprout at the same rate. While environmental conditions may alter germination time (e.g., if the soil is too cold, tomato seeds may take longer to germinate ...
Warm stratification requires temperatures of 15–20 °C (59–68 °F). In many instances, warm stratification followed by cold stratification requirements can also be met by planting the seeds in summer in a mulched bed for expected germination the following spring. Some seeds may not germinate until the second spring. [citation needed]
Optimum factors for ideal pollination are a relative humidity rate of 50–70% and temperature of 24.4 °C. If the humidity rate is higher than 90%, the pollen would not shed. Increasing air circulation is a favourable method of keeping humidity levels under control. [4]
Plants in hot areas that are provided partial shade during the hottest part of the day will bolt more slowly. Temperatures above 27 °C (81 °F) will generally result in poor or non-existent germination of lettuce seeds. [33] After harvest, lettuce lasts the longest when kept at 0 °C (32 °F) and 96 percent humidity.
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