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  • Author or Editor: M. Jurgrau x
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The use of a highly reflecting layer of aluminized polyester to increase the amount of downward solar radiation in a rose glasshouse was investigated during midwinter. Solar radiation at the south end of the untreated glasshouse was 20% higher than that at the north end during this season, corresponding to similar differences in the number of flowers produced in mid-winter. Covering the north wall with a reflecting layer increased the solar radiations flux density above a roe crop canopy by 7.5% for about half the length of the cropped area. Covering the paths with the same material increased the downward solar radiation by an average of 3%, the effect being twice as great adjacent to the south wall. Much larger increases were inferred in the flux of upward solar radiation reaching the under surfaces of the canopy. Carbon dioxide fixation of the upper leaves of the rose canopy was linearly related to incident solar radiation. The effect of the reflecting surfaces on rose yield calculated from this relationship was in general agreement with that previously derived from the seasonal correlation between flower production and solar radiation.

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