Abstract:

In order to determine the fertilizer which was most beneficial for the growth of transplanted seedlings, provide theoretical support for the practical production by studying the protective enzyme activity changes of leaves of transplanted Euonymus alatus (Thunb.) Sieb. in growing season after pouring fertilizer. This paper took 3-year-old Euonymus alatus (Thunb.)Sieb. as experiment material, poured fertilizer in which NPK ratio was 6:12:18 and the amount of fertilizer per plant for the F1 8.33 g, F2 28.33 g, F3 48.33 g, F4 68.33 g, F5 88.33 g, adopted one contrast, three repeat, poured fertilizer into the soil for 4 months on average, took 25 plants per cell and random arrangement. Then we sampled in the 10th day per month(April, May, June, July, August) and determine the enzyme activity. The results showed that: (a) the SOD activity changes increased and then decreased as a single-peak curve, and arrived at highest value under F3, F4, F5 treatment a month earlier than that under F1, F2 treatment; (b) the POD activity of seedlings after fertilization all arrived at the highest values in June and then decreased except the contrast; (c) the PPO activity of the contrast arrived at the lowest value in June to July, while the PPO activity after fertilization always had a increasing trend which had a significant difference with the contrast. By the comprehensive comparisons, it was found that the fertilizer under F3 treatment was the best option.