Optimizing vermiculite and sawdust ratios for enhancing composted green waste as a seedling substrate for cruciferous vegetables

文献类型： 外文期刊

第一作者： Chen, Yue

作者： Chen, Yue;Zhang, Lu;Tong, Jing

作者机构：

关键词： Circular bioeconomy; Peat alternative; Organic waste amendment; Cruciferous vegetable nursery; Multivariate analysis

期刊名称：JOURNAL OF MATERIAL CYCLES AND WASTE MANAGEMENT （ 影响因子：3.0； 五年影响因子：3.2 ）

ISSN： 1438-4957

年卷期： 2025 年

页码：

收录情况： SCI

摘要： Composted green waste (CGW) is an emerging alternative material for seedling substrate. However, its high salinity, bulk density, low porosity, and nutrient imbalance limit its application for seedling cultivation. This study investigated the effects of adding sawdust (0%, 20%, and 50%) and vermiculite (0%, 15%, and 25%) on the physicochemical properties of CGW and its suitability as a substrate for cruciferous vegetable seedlings. The combined amendment of 20% sawdust and 15% vermiculite significantly improved aeration porosity, water-holding porosity, total phosphorus, total potassium, and humic acid content by 5.9%, 3.9%, 43.9%, 5.1%, and 7.5%, respectively, compared to the unamended control (p <= 0.05). Seedlings of Brassica rapa (Chinese cabbage), Brassica chinensis (Shanghai qing), and Brassica rapa var. parachinensis (Choy sum) exhibited the highest germination energy under this exhibited substrate. Relative to unamended CGW, the germination energy of Chinese cabbage, Shanghai qing, and Choy sum increased by 21%, 200%, and 100%, respectively. Redundancy analysis, coupled with comprehensive assessment of plant morphological traits, confirmed that CGW amended with 20% sawdust and 15% vermiculite constitutes an optimal substrate formulation for cruciferous seedling production.

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