Article | 10. 2016 Vol. 34, Issue. 5
Impact of Pre-planting NH4+:NO3- Ratios in InertMedia on the Growth of Chinese Cabbage Plug Seedlings

Division of Soil and Fertilizers, National Institute of Agricultural Science, Rural Development Administration1
Department of Horticultural Sciences, College of Agriculture & Life Sciences, Chungnam National University2

2016.10. 736:745


This research was conducted to evaluate the impact of various pre-planting NH4+:NO3- ratios on the growth of plug seedlings of ‘Bool-am No.3’ Chinese cabbage. With fixation of the pre-planting N concentrations to 300 mg·kg-1 in a peatmoss+coir dust+perlite (3.5:3.5:3, v/v/v) medium, the NH4+:NO3- ratios were varied to 0:100, 27:73, 50:50, 73:27, 100:0. Then, the each of root media containing various ratios of NH4+:NO3- as well as equal concentrations of other essential nutrients was packed into 72-cell plug trays. After seeds of ‘Bool-am No.3’ Chinese cabbage were sown, the seedling growths were measured 2 and 4 weeks after sowing. The weekly analysis of root media and end-crop tissue analysis for mineral nutrients 4 weeks after seed sowing were also conducted. As the seedlings grew up, the pH of the root media increased, however ECs in all treatments of NH4+:NO3- ratios decreased. The concentrations of K, Ca and Mg in root media were higher in the treatments of NH4+:NO3- (100:0) and NH4+:NO3- (73:27) than those of NH4+:NO3- (0:100) and NH4+:NO3- (27:73) 2 weeks after seed sowing. But the concentrations of K, Ca, Mg and Zn were get lowered in all treatments and the differences among treatments were not significant 4 weeks after sowing. The highest NH4+ and lowest NO3- concentrations of the root media were observed in the NH4+:NO3- (100:0) among all treatments. Contrary to these, the treatment of NH4+:NO3-(0:100) had the lowest NH4+ and highest NO3- concentrations. The seedling growth in terms of fresh and dry weights of aerial part were the highest in the treatment of NH4+:NO3- (23:73) at 2weeks after sowing and those of NH4+:NO3- (50:50) at 4 weeks after sowing. The survival rate of seedlings in NH4+:NO3- (100:0) treatment were 19% and the growth of aerial part 4 weeks after sowing was the poorest among all treatments tested. The results mentioned above indicate that the pre-planting NH4+ ratio in inert media should not exceed 25% in plug stage 1 through 3 (until 2true leaf development) and 50% in plug stage 4 (after 2 true leaves to transplant).

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