Abstract: In order to decrease the node position of the first female flower in cucumber plug breeding in summer, an experiment with cucumber cultivar ‘Yousheng F1’ was conducted to study the effects of watering with different temperature water (7 ℃, 11 ℃, 15 ℃, 22 ℃+ ethylene) on the position of the first female flower and its growth and development, taking the water with temperature 22 ℃ as the control. As compared with the control, all the treatments except 22 ℃ water + ethylene resulted in the decrease of the position of the first female flower and the enhancement of seedling index. At the growth stage of fourleaf and one tip, the seedling height in treatment 7 ℃ water reduced by 24%, stem diameter increased by 10%, and the first female flower position was at 4.8, whereas the seedling dry mass in treatment 11 ℃ water increased by 14%, and the first female flower position was at 5.6. Though the two treatments were all significantly better than the control and treatment 22 ℃ water + ethylene, treatment 11 ℃ water could be more suitable for cucumber plug breeding, in considering the economic input.

Key words: state space method, comprehensive capacity of resources and environments, Poyang Lake Eco-economic Zone.