Effect of dark period lighting regulation on cucumber seedling morphology and comprehensive evaluation analysis and comprehensive evaluation

The aim of this study is to ascertain light quality and light duration at dark duration and its influence on the growth and morphological of cucumber seedling, light-emitting diodes lights were taken as supplemental light at dark period for cucumber seedlings to study in this paper. According to the influence confirmed by using comprehensive evaluate method, suitable light quality and light duration were selected. Cucumber "Jin Chun IV" seedlings were planted in greenhouse with or without supplemental light during dark period for two groups of experiments. In the first group of experiments, the treatments were 4 types LED light, L1, L3, L4, which supplementing light times were 2 h, 4 h and 6 h respectively during dark period, and no supplemental light in dark period were taken as control (CK). In conclusion, the most suitable supplemental lighting time during dark period for cucumber seedlings was four hours. The most suitable light quality for cucumber seedling at early stage was L4, and the most suitable li