Vol. 43

Title:
Temperature—DIF

Author:
H.E. Kresten Jensen

pp: 191-193

Abstract:
INTRODUCTION

Until a few years ago, standard practice in the greenhouse industry was to keep the night temperature for potted plants set lower than the day temperature The reasoning was, that photosynthesis at day should be promoted by a high temperature and respiration at night should be limited by a lower temperature. In addition, the free heat from the sun during daylight should he utilized and the energy consumption at night should be limited to reduce production cost. Plant height and elongation growth was not considered—compact growth was obtained by the use of chemical growth retardants.

The use of chemicals, i.e., growth retardants, is now questioned and in society there is a general wish that chemicals should be used to a lesser extent. In Germany and Sweden, Alar is prohibited and this may also happen in Denmark for this and other chemicals. For these reasons growers and researchers are looking for other means to control plant height.

Therefore, much interest was generated by

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