Abstract: The effect on cucumber seedlings of different nutrient content of new environmentfriendly substrates which were mainly composed of the fermentation products of crop straws was explored. The results showed that higher effective nitrogen content in seedling substrates was not conducive to cultivating strong seedlings, and the suitable content of the effective nitrogen, phosphorus and potassium before the fifth leaf emerged was 160, 950 and 3 600 mg·kg-1, respectively, and the effective phosphorus content should be increased to 1 700 mg·kg-1 after the fifth leaf emerged. These findings suggested that the use of crop straws fermentation products as the materials and sources of nutrients of substrates for cucumber seedling is feasible.

Key words: cucumber, substrate, seedling, nutrient