Abstract: Reasonable application of ammonium dihydrogen phosphate [(NH4)2HPO4] in substrate was expectedto provide nitrogen and phosphorus fertilizer for rapeseed blanket seedling growing. To optimize the application, wemeasured biomass, survival rate, leaf area, green leaves, seedling height, root collar length and root collar diameter.Results suggested that the application of (NH4)2HPO4 could significantly increase survival rate, seedling biomass,leaf area, green leaves rate, root collar diameter. It aslo reduced death rate during seedling growth. Regression analy⁃sis between the application amount and shoot dry weight, root dry weight and leaf area showed that the optimal appli⁃cation amount of (NH4)2HPO4 was about 6 g per plate by using standard rice nursery plate.

Key words:  , Brassica napus L.；rapeseed blanket seedling；(NH4)2HPO4；application amount；substrate