在扦插苗圃用不同颜色的塑料薄膜进行覆盖，观察地温、气温和空气湿度的变化对扦插苗发根的影响。
By covering tea cutting stock with various plastic film and observing the effect of different soil-temperature atmospheric-temperature air-humidity on the rooting of tea cutting.
相对湿度，是空气中绝对湿度与饱和湿度的比值，它随着温度变化。
Relative humidity, a percentage, is the ratio between the water vapor present and the air's saturation point, a figure that changes with the temperature.
近地层空气湿度的日变化与温度相反。
The daily change of air humidity in surface layer is contrary to that of temperature.
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