The purpose of this study was to investigate the response of physicochemical properties of tobacco-growing soils and N/P/K accumulation of tobacco plant to tobacco straw biochar. Two contrasting tobacco-growing soils of paddy soil (Ultisol in USDA taxonomy) and brown soil (Alfisol in USDA taxonomy) were selected to conduct the pot experiments. Five addition rates ( w/w ) of tobacco straw biochar of 0%, 1%, 2%, 4%, and 10% without or with tobacco ( Nicotiana tabacum ) were applied in a greenhouse. The 7.41–35.90% increase of soil field capacity, 0.71–15.11% increase of total porosity, 3.40–17.55% increase of capillary porosity, 15.98–293.13% increase of organic matter, 6.52–58.75% increase of available phosphorus, 109.07–1789.70% increase of potassium, 3.23–147.71% increase of exchangeable cation, and 12.13–48.48% increase of soil pH were observed after biochar addition. And this improvement increased with the increasing application rate. The same trend was also found in the tobacco N/P/K uptake in the biochar application range of 0–4% and subsequently decreased at 10% rate. Meanwhile, biochar decreased the soil bulk density of 0.68–14.06%. The step regression equation showed that the exchangeable potassium and aluminum for Ultisol as well as the exchangeable potassium and hydrogen for Alfisol were the predominant factors that determined the soil pH. According to the PCA results, exchangeable calcium > exchangeable potassium > exchangeable cation > pH > organic matter > exchangeable magnesium > available potassium > available phosphorus and organic matter > exchangeable potassium > available phosphorus > exchangeable cation > available potassium > pH > exchangeable calcium had a significant impact on soil fertility of Ultisol and Alfisol, respectively. Finally, a comprehensive evaluation of soil fertility by PCA revealed that ST10 (10% rate, w/w ) performed best, followed by the ST4 (4% rate, w/w ) in both soils. The application of tobacco straw biochar, with appropriate rate, is an effect method to improve physicochemical properties of tobacco-growing soil and N/P/K uptake of tobacco plant.

中文翻译：

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烟草种植土壤理化性质和烟草植株氮磷钾积累对烟草秸秆生物炭的响应

本研究的目的是研究烟草种植土壤理化性质和烟草植株氮磷钾积累对烟草秸秆生物炭的响应。选择两种对比鲜明的水稻土（美国农业部分类学中的 Ultisol）和棕壤（美国农业部分类学中的 Alfisol）进行盆栽试验。在温室中应用五种添加率 (w/w) 的烟草秸秆生物炭，分别为 0%、1%、2%、4% 和 10%，不含或含烟草 (Nicotiana tabacum)。土壤田间持水量增加 7.41-35.90%，总孔隙度增加 0.71-15.11%，毛细管孔隙度增加 3.40-17.55%，有机质增加 15.98-293.13%，有效磷增加 6.52-58.75%。977-107-100钾增加 %，可交换阳离子增加 3.23-147.71%，12.13-48。添加生物炭后，观察到土壤 pH 值增加了 48%。并且这种改进随着施用率的增加而增加。在生物炭应用范围 0-4% 的烟草 N/P/K 吸收中也发现了相同的趋势，随后以 10% 的速率下降。同时，生物炭使土壤容重降低 0.68-14.06%。逐步回归方程表明，Ultisol 的钾和铝交换量以及 Alfisol 的钾和氢交换量是决定土壤 pH 值的主要因素。根据PCA结果，可交换钙>可交换钾>可交换阳离子>pH值>有机质>可交换镁>有效钾>有效磷和有机质>可交换钾>有效磷> 可交换阳离子 > 速效钾 > pH > 可交换钙对 Ultisol 和 Alfisol 的土壤肥力分别有显着影响。最后，PCA 对土壤肥力的综合评估显示，两种土壤中 ST10（10% 率，w/w）表现最好，其次是 ST4（4% 率，w/w）。烟草秸秆生物炭适量施用，是改善烟草种植土壤理化性质和烟草N/P/K吸收的有效方法。