Summary: Relative humidity values observed in fertilized rice crops and in reference crops which received no fertilization, during various phenophases of the crop, were compared to values measured over a free water surface and over a dry soil area.

We found that the humidity of the air space of the crops is exhibiting a close correlation to the growth of the crop. From the beginning of the phenophase of intense growth, we have, within the fertilized and denser rice crop during the greatest part of the day, a relative humidity which is approximating saturation and this could yield an explanation for the intensive fungus infection of these crops.

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