In raising vegetable seedlings using cylindrical paper pots, the root substrates inside paper pots dry out fast mainly due to air spaces between paper pots created by chinks between the pot’s exterior and the holding tray. Frequent watering is necessary that contributes to the loss of nutrients by leaching during seedling production. This study was carried out to investigate the appropriate concentration of nitrogen required as a pre-planting fertilizer for growing fruit-bearing vegetable seedlings in cylindrical paper pots. For the experiment, the paper pots were made with the root substrate containing perlite (1–3 mm) and peat moss (10-mesh, 10–20% by volume) and they were placed into the 40-cell trays. The concentrations of all essential elements except nitrogen was equal in all treatments and the N concentration was adjusted to 0, 150, 250, 500, and 750 mg L⁻¹ during the substrate formulation. Then, seedling grafts of cucumber, watermelon and tomato were transplanted and seeds of hot pepper were sown directly into the paper pots. The growth of cucumber, watermelon, and tomato plants were measured at 15, 18, and 21 days after transplanting and pepper at 5 weeks after seed sowing. The concentrations of macro-elements, pH, and EC of root substrates were analyzed every week. The pH of root substrates gradually increased during the seedling growth, but the differences in pH among N treatments is not significant. The EC in all treatments did not changed until one week after the transplanting of cucumber, watermelon, and tomato seedling grafts and 3 weeks after seed sowing of pepper. The concentration of Ca remained similar over time during the entire experimental period, but the concentration of Mg and K decreased 3 weeks after the seed sowing for the pepper growing root substrate. The concentrations of Ca, Mg, and K gradually decreased after one week of transplantation (cucumber, watermelon, and tomato). Based on the results, the optimal concentration of N required is 250 mg L⁻¹ for tomato and 500 mg L⁻¹ for cucumber, watermelon, and pepper respectively. In summary, the appropriate N concentration in the root substrate of paper pot is 250–500 mg L⁻¹, and post-planting fertilization period is 1 week after transplanting for cucumber, watermelon and tomato and 3 weeks after seed sowing for hot pepper.

在使用圆柱形纸盆栽种蔬菜幼苗时，纸盆内的根基基质很快变干，这主要是由于纸盆之间的空气间隙是由花盆外部和支撑托盘之间的缝隙形成的。经常浇水是必要的，这会因幼苗生产过程中的浸出而导致营养损失。进行了这项研究，以研究在圆筒形纸盆中种植水果类蔬菜幼苗所需的适当氮素浓度，作为种植前的肥料。对于实验，用含有珍珠岩（1-3 mm）和泥炭藓（10目，占体积的10-20％）的根基制成纸盆，然后将它们放入40格的托盘中。在所有处理中，除氮外所有必需元素的浓度均相同，并且将氮浓度调整为0、150、250，^-1在底物配制过程中。然后，将黄瓜，西瓜和番茄的幼苗移植，并将辣椒种子直接播种到纸盆中。在移栽后15、18和21天测量黄瓜，西瓜和番茄植物的生长，在种子播种后5周测量辣椒的生长。每周分析根基质的宏观元素，pH和EC浓度。幼苗生长过程中，根系底物的pH值逐渐升高，但N处理之间的pH值差异不显着。在所有处理中，EC直到黄瓜，西瓜和番茄幼苗移植物的移植后1周和胡椒种子播种的3周后才发生变化。在整个实验期间，Ca的浓度在一段时间内保持相似，但是在播种后3周，Mg和K的浓度下降，辣椒生长的根系基质。移植一周（黄瓜，西瓜和番茄）后，Ca，Mg和K的浓度逐渐降低。根据结果​​，所需的最佳氮浓度为250 mg L^-1用于番茄和500毫克的L ^-1分别黄瓜，西瓜，和胡椒。总之，纸盆根部基质的适宜氮浓度为250–500 mg L ^-1，黄瓜，西瓜和番茄的移栽后施肥期为1周，辣椒播种的播种后施肥期为3周。