Soilmeter

The Soilmeter will, when used with right click, tell you the local conditions that affect Rice and Tea growth. Those conditions are altitude, temperature and humidity. Holding shift while hovering over a Tea Seed or Rice Seedling will tell you the conditions that plant favors. Tea prefers an altitude of 80 to 110 meters (262 to 360 feet) and a cool to warm temperature. Rice likes a semi-humid to humid and cool to warm climate.

Some screenshots of me using the Soilmeter:

(I will add these when I find my screenshots)