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Impact of biosolarization with almond hull and shell amendments for the control of Fusarium oxysporum f. sp. lactucae in a lettuce/tomato cropping system
Crop Protection ( IF 2.5 ) Pub Date : 2021-11-01 , DOI: 10.1016/j.cropro.2021.105856
Ana M. Pastrana 1 , Emily A. Shea 2 , Jesus D. Fernandez-Bayo 3 , Brittany Allison 2 , Dean C. Watson 1 , Juliano Toniato 2 , Thomas R. Gordon 1 , Christopher W. Simmons 2
Affiliation  

Biosolarization is an alternative to chemical fumigation that couples solarization and organic amendments to control diseases by increasing temperature and microbial activity. A field study was conducted to evaluate the efficacy of biosolarization, using almond processing residues from two varieties, to control propagules of Fusarium oxysporum f. sp. lactucae, the causal agent of Fusarium wilt of lettuce. Peak soil temperatures of solarized and biosolarized soils were 6–15 °C higher than control soils, and biosolarized soils experienced 1 to 3 °C higher temperatures on average and 10 to 27°C-day higher cumulative temperatures than soil solarized without amendment. Residues were high in endogenous organic acids, between 144 and 298 mM combined acetic, lactic, succinic, and butyric acids. After eight days of treatment, solarized soils only reduced the population of Fusarium oxysporum f. sp. lactucae by 9% compared to the average non-treated non-amended control plots; whereas soils solarized and amended with residues from pollinator varieties of almonds showed a greater pathogen reduction of 63%. In this instance, Fusarium wilt had no effect on plant health due to low pressure and moderate innate plant resistance. Soils amended with nonpareil residues had similar lettuce biomass and health scores to untreated plots, but lower health scores than the solarized treatments. This may be due to residual organic acids detected in biosolarized plots 3–4 weeks after treatments (1–57 mM), which significantly correlated to poor lettuce health score. Roughly, one year after soil treatment, solarized plots continued to out-perform pollinator-residue amended plots. Germination assays indicate biosolarization outcomes may be improved with increased aerobic remediation time.



中文翻译:

用杏仁壳和壳改良剂进行生物日晒对控制尖孢镰刀菌的影响。sp. 莴苣/番茄种植系统中的乳科植物

生物日晒是化学熏蒸的替代方法,它将日晒和有机改良剂结合起来,通过增加温度和微生物活动来控制疾病。进行了一项田间研究,以评估使用来自两个品种的杏仁加工残留物的生物日晒法控制尖孢镰刀菌繁殖体的功效。sp. 莴苣,生菜枯萎病的病原体。日晒和生物日晒土壤的峰值土壤温度比对照土壤高 6-15°C,与未经改良的日晒土壤相比,生物日晒土壤的平均温度高 1 至 3°C,日累积温度高 10 至 27°C。内源性有机酸的残留量很高,在 144 到 298 mM 的醋酸、乳酸、琥珀酸和丁酸中。经过 8 天的处理,日晒土壤只会减少尖孢镰刀菌的数量。sp. 莴苣与平均未处理的未修正对照地块相比,降低了 9%;而用授粉品种杏仁的残留物进行日晒和改良的土壤显示病原体减少了 63%。在这种情况下,枯萎病由于低压和适度的先天植物抗性而对植物健康没有影响。用极好的残留物改良的土壤与未经处理的地块具有相似的生菜生物量和健康评分,但健康评分低于日晒处理。这可能是由于在处理后 3-4 周(1-57 mM)的生物日晒地块中检测到残留有机酸,这与生菜健康评分不佳显着相关。粗略地说,土壤处理一年后,日晒地块的表现继续优于传粉媒介残留修正地块。

更新日期:2021-11-16
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