Arup Borgohain's research while affiliated with Dibrugarh University and other places

... The annual production of green tea is 1.8494 million tons, accounting for 60.38% of the total production (Association 2022). In recent years, there have been more and more reports on the excess of HMs in tea (Ju et al. 2024;Gogoi et al. 2023;SeyyediBidgoli et al. 2020). According to popular belief, the soil in tea plantations serves as the plant's physical foundation. ...

... Jiang et al. [11] analyzed the rhizosphere soil of the tea plant and found that pruning could alleviate the degradation of the rhizosphere soil of the tea plant, improve the ecosystem function of the tea plantation, and thus stabilize tea yield, but it would reduce the content of polyphenols and amino acids in the tea leaves. Borgohain et al. [12] analyzed soil litter accumulation and found that tea plant litter after pruning could promote tea plant growth and improve tea plant biomass. It can be seen that pruning was indeed beneficial in promoting the growth of tea plants. ...

... [25][26] Zinc and nickel are also important in plant growth. 27 Although the presence of zinc and nickel ions are not considered dangerous metals, excessive accumulation of these ions in the body can cause poisoning in humans. 28 For example, the presence of too many zinc ions in the body causes the ion to bind to vital enzymes and macromolecules in the body and alter their function. ...

... Healthy soils for tea gardens frequently have a total nitrogen content of more than 0.1%. The pH of the soil can fluctuate between (4.5 and 5.50) [9]. Two methods are available for determining the type of soil: image analysis and chemical analysis [10]. ...

... [128] --Tea pruning litter biochar (TPLBC) 400 kgha -1 of TPLBC improved Mn, Cu, and Zn at a 5% level of significance. [129] Thale cress (Arabidopsis thaliana) Brassicaceae ...

... Fortunately, several studies have investigated the use of LDHs as SRFs for different nutrients. Gogoi et al. synthesized NO 3 − intercalated ZnAl-LDH composites by co-precipitation as a nitrogen SRF for crop production, 190 demonstrating 90% (w/w) and 85.45% (w/w) of intercalated NO 3 − at pH values of 5.25 and 7, respectively were released in 30 days. The results showed that LDHs possess the ability to supply plants with accessible N for long periods, even in acidic soils. ...

... ( TPLBC is beneficial for tea cultivation, and it is effective in decreasing Cd, As, and Cr in made tea. [128] --Tea pruning litter biochar (TPLBC) 400 kgha -1 of TPLBC improved Mn, Cu, and Zn at a 5% level of significance. [129] Thale cress (Arabidopsis thaliana) Brassicaceae ...

... Tea plant is an acidophilic plant that is suitable for tea plant growth when the soil pH is between 4.5 and 5.5, and unsuitable for tea plant growth when the pH is less than 4.5 or greater than 5.5 [21][22][23]. In this study, rhizosphere soil pH of tea plants in 30 tea plantations was collected and determined, and the results showed (Table S3) that the distribution of soil pH was in the range of 3.29 to 5.58, with a mean value of 4.51 and a coefficient of variation of 17.29%. ...

... Therefore, it can be speculated that the variable results on the nutrient contents in the various biochars may be attributed to plants having potentially distinct elemental compositions across different tissues (or organs), or the exposure to different management levels, feedstock origins, times for feedstock collection, etc. Notably, based on the International Biochar Initiative (IBI, 2014), the Zn, Cr, Cu, Pb, and Cd contents in the six pecan biochars were all in the safety range (the maximum allowed thresholds for them were 200-7000, 64-1200, 63-1500, 70-500, and 1.4-39 mg kg −1 , respectively). Therefore, there would be no potential risk of heavy metal pollution in the six pecan biochars to the environment after the application of the biochars (Table S1) [29,68]. ...