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Germination of seeds, and the growth rate of plants, depend on temperature.  As roots penetrate the soil, they experience different temperature conditions from those at the surface, and different levels of moisture, too.

Questions

How deep do plant roots penetrate into the soil, for different crops?

How does temperature change in the soil as we go deeper?

How does the temperature change under the surface of the soil affect growing plants?

How does temperature in the soil vary at different depths day by day, month by month and year by year?

How much does variation of temperature within the soil (on all these time scales) affect success?

How critical is successful plant growth on temperature?

What are the crops and varieties which are most likely to succeed here?

Answers

...watch this space!