Response in Physicochemical Properties of Tobacco-Growing Soils and N/P/K Accumulation in Tobacco Plant to Tobacco Straw Biochar

Abstract

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.

Fate and health risk assessment of heavy metals in Brassica chinensis L. (pak-choi) and soil amended by sludge-based biochar

“…The enrichment effect (EC) of Brassica chinensis L. on six types of heavy metals was also weak, and the EC value was signi cantly reduced after adding biochar. This nding con rms the ndings of Zheng et al (Zheng et al 2020), who had prepared biochar using attapulgite and sludge pyrolysis. Moreover, compared with the EC value of the CK group, the enrichment factors of Brassica chinensis L. for heavy metals decreased in the order of: Zn > Cu > Ni > Cd > Pb > Cr.…”

Biochar increases tobacco yield by promoting root growth based on a three-year field application

“…The increase in leaf area index of the flue-cured tobacco lays the foundation for improving the maturity and yield quality of the flue-cured tobacco at the later stage. Biochar can increase the total biomass of tobacco, which is an important economic crop 42 . Therefore, the increased total biomass is of great significance to farmers.…”

Influence of soil characteristics on the concentrations of Cr, Pb, and Zn in tobacco leaves from Longyan, China, and the associated predictive models

“…The methodologies employed in our study, meticulously adapted and expanded from [24][25][26][27][28][29][30], were instrumental in providing a comprehensive analysis of the soil samples. These methods enabled us to accurately assess the content of Pb, Cr, and Zn, thereby offering insights into the heavy metal pollution levels of the area.…”