Effects of 30-years deficiency fertilization and chemical fertilizer reduction combined with burned soil on cassava yield and microbial community in the rhizosphere soil

文献类型： 外文期刊

第一作者： Wei, Yunxia

作者： Wei, Yunxia;Huang, Jie;Xu, Ruili;Xue, Xinxin

作者机构：

关键词： Cassava; Long-term fertilization regime; Nutrients deficiency; Soil quality; Microbial functional prediction

期刊名称：PLANT AND SOIL （ 影响因子：4.1； 五年影响因子：4.7 ）

ISSN： 0032-079X

年卷期： 2025 年

页码：

收录情况： SCI

摘要： Background and aimsCassava adapts to infertile soils, but long-term inadequate fertilization impacts on yield and soil microbes remain unclear. This study aims to evaluate three-decade fertilization effects on cassava productivity, soil microbial communities, and resilience mechanisms to inform sustainable tropical agriculture strategies.MethodsRhizosphere soils were sampled from a 30-years experimental field with six treatments: NPK (balanced fertilization), PK (N-deficiency), NK (P-deficiency), NP (K-deficiency), -NPK (no fertilization), and FNPK (50% NPK plus burned soil). High-throughput sequencing was used to analyze microbial community composition and functions.ResultsDeficiency treatments (PK, NK, NP, and -NPK) decreased yield by 38.6% (P = 0.000), 21.3% (P = 0.021), 38.1% (P = 0.000), and 61.6% (P = 0.000) versus NPK, respectively, while FNPK maintained yield (P = 0.480). Compared to NPK, NK intensified acidification (pH decrease 6.0%), and NP depleted organic carbon (34.0% loss), whereas FNPK improved soil pH by 13.6% and nutrients availability. Deficiency fertilization did not significantly impact on bacterial and fungal alpha-diversity, whereas FNPK increased bacterial richness, diversity, and modified bacterial and fungal beta-diversity. Soil pH mainly drove microbial community shifts. FNPK treatment reduced abundances of Acidobacteriota and Crenarchaeota phyla while boosted abundances of Acidobacteriota genus RB41 and Proteobacteria MND1. FNPK shifted dominant fungal phyla from Ascomycota to Basidiomycota, and reduced the wilt-associated genus Melanconiella. PK, NK, and -NPK suppressed key microbial functions, FNPK enhanced functional groups of chemoheterotrophy, and arbuscular mycorrhizal.ConclusionThese findings suggest that prolonged nitrogen-based fertilization exacerbates soil acidification and disrupts microbial communities, while integrating burned soil with chemical fertilizers can improve fertility and diversity.

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