Abstract
Foliar sprays of either 20% methanol or 20% methanol + nutrients (Carbonkick) in water, were applied weekly to greenhouse roses, tomato and cucumber during 4–6 weeks. The plants were grown at 18.7 °C air temperature in growth chambers placed in a greenhouse compartment, and supplied with a photosynthetic photon flux density of 175 μmol m −2 s −1 for 18 h day −1. No effects of the two foliar spray treatments were found on any of the species, as compared to control plants grown either in the same chamber or in a separate chamber. Foliar sprays of aqueous methanol, at least so far, can not be recommended for greenhouse crops under supplementary lighting during winter. The present results are discussed in relation to the positive effects of methanol previously found in field and greenhouse crops.
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