Abstract:

In the experiment of improving soil fertility in newly reclaimed mountain land, three different organic fertilizers, pig manure, sheep manure, and mushroom residue, were applied in combination with inorganic fertilizers to plant sweet potatoes. The results showed that organic fertilizers significantly increased the number of bacterial and fungal communities in the soil compared with the blank treatment. The increase in soil fertility led to a sharp increase in soil microbial numbers and improved soil acidification caused by the application of inorganic fertilizers. During the growth process of sweet potatoes, the distribution and biodiversity analysis of soil macrofauna were investigated under different fertilization treatments. Eight groups of soil macrofauna were captured in the sweet potato field, among which the Shannon-Wiener diversity index and PieLou evenness index of pig manure commercial organic fertilizer treatment were the highest, increased by 40.91% and 15.66% respectively compared with the blank treatment, and increased by 158.33% and 88.23% compared with the inorganic fertilizer treatment. The blank treatment and inorganic fertilizer treatment had the relatively low number of individuals and groups, and the inorganic fertilizer treatment had the lowest Shannon-Wiener diversity index and PieLou evenness index.

Key words: organic fertilizer, sweet potato, soil macrofauna, newly reclaimed mountain land, effect