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            Relative humidity is the ratio of the amount of water vapor actually in the air to the maximum amount that the air can hold at that temperature. It is inversely related to the temperature. If the temperature is high, humidity is low, meaning that air is dry and vice versa. High temperature and low relative humidity cause the plant to wilt. Low temperature and high humidity, on the other hand, cause the formation of fog that favors reproduction of fungus and occurrence of pest and diseases.

             This climatic parameter has positive relationship with the rainfall pattern and was observed commonly even throughout the year. The relative humidity values range from 75 to 88 percent and lower during lean months. It exerts its influence upon the transpiration and consequently, the “turgor pressure” of the leaves of the plants, enhancing the translocation of the plant food nutrients and metabolic within the plant system.




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