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2. BBCH-scale (potato) - Wikipedia

   en.wikipedia.org/wiki/BBCH-scale_(potato)

   Stems growing towards soil surface, Hypocotyl with formation of scale leaves in the axils; cotyledons growing of which stolons will develop later towards soil surface 09: 009: Emergence: stems break through soil surface; cotyledons break through soil surface 021–029 1: 1: Leaf development 10: 100: From tuber: first leaves begin to extend

3. Physical properties of soil - Wikipedia

   en.wikipedia.org/wiki/Physical_properties_of_soil

   Soil temperature depends on the ratio of the energy absorbed to that lost. [68] Soil has a mean annual temperature from -10 to 26 °C according to biomes. [69] Soil temperature regulates seed germination, [70] breaking of seed dormancy, [71] [72] plant and root growth [73] and the availability of nutrients. [74]

4. Growing degree-day - Wikipedia

   en.wikipedia.org/wiki/Growing_degree-day

   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.

5. This Seed Spacing Hack Will Make It Easy to Plant Your Garden

   www.aol.com/seed-spacing-hack-easy-plant...

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6. Sowing - Wikipedia

   en.wikipedia.org/wiki/Sowing

   A seed rate of about 100 kg of seed per hectare (2 bushels per acre) is typical, though rates vary considerably depending on crop species, soil conditions, and farmer's preference. Excessive rates can cause the crop to lodge, while too thin a rate will result in poor utilisation of the land, competition with weeds and a reduction in the yield .

7. Soil thermal properties - Wikipedia

   en.wikipedia.org/wiki/Soil_thermal_properties

   The single probe method employs a heat source inserted into the soil whereby heat energy is applied continuously at a given rate. The thermal properties of the soil can be determined by analysing the temperature response adjacent to the heat source via a thermal sensor. This method reflects the rate at which heat is conducted away from the probe.

8. USDA soil taxonomy - Wikipedia

   en.wikipedia.org/wiki/USDA_soil_taxonomy

   The soil suborders within an order are differentiated on the basis of soil properties and horizons which depend on soil moisture and temperature. Forty-seven suborders are recognized in the United States. [6] The soil great group category is a subdivision of a suborder in which the kind and sequence of soil horizons distinguish one soil from ...

9. Germination - Wikipedia

   en.wikipedia.org/wiki/Germination

   Many seeds germinate at temperatures slightly above 60-75 F (16–24 C) [room-temperature in centrally heated houses], while others germinate just above freezing and others germinate only in response to alternations in temperature between warm and cool. Some seeds germinate when the soil is cool 28–40 F (-2 - 4 C), and some when the soil is ...