EFFECTS OF ATMOSPHERIC HUMIDITY ON GREENHOUSE CROPS
The paper draws together information about the influence of atmospheric humidity on all aspects of crop production in greenhouses. Special attention is given to humidities which encourage plant diseases and cause physiological disorders. Occasions when high humidities are desirable (e.g. generating root-pressure to minimize calcium deficiency in fruit or young leaves, using pathogenic fungi to control insect pests, and propagating plants from leafy cuttings) are discussed in relation to energy-saving practices in greenhouses.