Effects of Long-Term Fertilization on Soil Physical and Chemical Properties of “Dangshansuli” Pear Orchard

Le résumé fourni par la source

Currently, inefficient fertilization practices are frequently observed in orchards in Dangshan County, which leads to substantial changes in the soil physicochemical properties and growth disorders in pear trees. This study investigated the effects of long-term fertilization on the different soil layers and aimed to establish scientific fertilization guidelines for “Dangshansuli” pear orchards. In May 2020, a total of 30 soil samples were collected from a “Dangshansuli” pear orchard that was subjected to long-term fertilization and from an unfertilized control area that had been maintained for 30 years. These samples were analyzed for their physicochemical properties, mineral elements, heavy metal content, chemical compound diversity, and allelopathic effects. Long-term fertilization considerably reduced the soil pH and increased the soil organic matter content. The contents of available potassium, exchangeable calcium, and magnesium in the fertilized soil were optimal for pear tree growth, whereas the available iron was insufficient. Although long-term fertilization led to the accumulation of heavy metals, including Cu, Hg, Ni, Cr, As, and Mn, their concentrations remained within safe limits. The number of chemical compounds detected in the fertilized soil was significantly higher than in the control. In addition, allelopathy tests indicated that 0.18 mmol·L⁻¹ octadecane exerted a strong allelopathic effect on the tissue-cultured seedlings of “Shanli” (Pyrus ussuriensis Maxim). Conclusion: These findings provide a basis for the development of optimal fertilization strategies in “Dangshansuli” pear orchards.

Ce résumé expose les affirmations des auteurs. BNTIC ne l’interprète pas comme une validation indépendante des résultats.