Lisuma Jacob B, Mbega Ernest R, Ndakidemi Patrick A
Department of Sustainable Agriculture and Biodiversity Ecosystem Management, School of Life Science and Bio-Engineering, The Nelson Mandela African Institution of Science and Technology (NM-AIST), Arusha 23000, Tanzania.
Department of Research, Tobacco Research Institute of Tanzania (TORITA), Tabora 45000, Tanzania.
Plants (Basel). 2021 Aug 4;10(8):1597. doi: 10.3390/plants10081597.
This research was conducted to evaluate the trends of the extractable micronutrients boron (B), copper (Cu), iron (Fe), manganese (Mn), and zinc (Zn) in soils differing in textures and collected before tobacco cultivation, and in after unfertilized and fertilized (NPK and CAN 27%) plots. The soils and tobacco leaves were assessed on the contents of the micronutrients after unfertilized and fertilized tobacco cultivation. In soils, tobacco cultivation with fertilization increased the extractable Cu, Fe, Mn, and Zn by 0.10, 11.03, 8.86, and 0.08 mg kg, respectively, but decreased the extractable B by 0.04 mg kg. The effects of fertilization increased the extractable Cu, Fe, Mn, and Zn by 0.14, 14.29, 9.83, and 0.24 mg kg, respectively, but decreased B by 0.08 mg kg. The combination effects of tobacco cultivation and fertilization increased the extractable Cu, Fe, Mn, and Zn by 0.24, 25.32, 18.69, and 0.32 mg kg, respectively, but decreased the extractable B by 0.12 mg kg. The results revealed that the solubility of the extractable Zn, Mn, Cu, and Fe in soils were increased by both tobacco and fertilization, but the extractable B was decreased. The fertilization of the studied soils with NPK + CAN fertilizers significantly increased the concentration of the extractable micronutrients in tobacco leaves. Based on the findings of this study, further research must be conducted to investigate the effects of tobacco cultivation on soil health and fertility beyond considering only soil pH, SOC, micronutrients, and macronutrients. These studies should include the relationship between soil fertility (pH, texture, CEC, base saturation, etc.), micronutrients, and agronomic practices on the effect of tobacco cultivation on the extractability of B, Cu, Fe, Mn, and Zn.
本研究旨在评估质地不同且在烟草种植前采集的土壤中可提取微量营养元素硼（B）、铜（Cu）、铁（Fe）、锰（Mn）和锌（Zn）的含量变化趋势，以及未施肥和施肥（NPK和27%硝酸钙）地块种植烟草后的含量变化。在未施肥和施肥种植烟草后，对土壤和烟草叶片中的微量营养元素含量进行了评估。在土壤中，施肥种植烟草使可提取的Cu、Fe、Mn和Zn分别增加了0.10、11.03、8.86和0.08 mg/kg，但可提取的B减少了0.04 mg/kg。施肥的效果使可提取的Cu、Fe、Mn和Zn分别增加了0.14、14.29、9.83和0.24 mg/kg，但B减少了0.08 mg/kg。烟草种植和施肥的综合作用使可提取的Cu、Fe、Mn和Zn分别增加了0.24、25.32、18.69和0.32 mg/kg，但可提取的B减少了0.12 mg/kg。结果表明，烟草种植和施肥均增加了土壤中可提取的Zn、Mn、Cu和Fe的溶解度，但可提取的B减少了。用NPK + 硝酸钙肥料对研究土壤施肥显著提高了烟草叶片中可提取微量营养元素的浓度。基于本研究的结果，必须进一步开展研究，以调查烟草种植对土壤健康和肥力的影响，而不仅仅考虑土壤pH值、有机碳、微量营养元素和大量营养元素。这些研究应包括土壤肥力（pH值、质地、阳离子交换量、盐基饱和度等）、微量营养元素以及农艺措施与烟草种植对B、Cu、Fe、Mn和Zn提取率影响之间的关系。
