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Besides the effect of zeolites against plant diseases and insect pests, zeolites may also have beneficial effects for the treated plant itself.Zeolites are able to adsorb CO2, which may influence photosynthesis.Zeolites may also reduce leaf temperature by reflecting the infrared radiation.These properties lead to a reduction of transpiration rate, which may improve the water-use efficiency, the yield and the fruit quality.In this study, the possible beneficial effects of zeolites on plant growth, dry weight, water uptake and photosynthesis are described.Despite the fact that little or no effects were observed for plant growth, water uptake and dry weight, some effects were noticed for the photosynthesis.A clear trend could mainly be observed for the treated apple trees, i.e. an increase of photosynthesis was observed after treating the apple trees with the zeolites, followed by a decrease after two weeks.
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Smedt et al. (2017) studied this question.
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