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Ruan, Jianyun; Zhang, Fusuo; Wong, Ming Hung

doi:10.1023/a:1004882001803

Cited by 66 publications

(17 citation statements)

References 20 publications

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“…In the tea plantations on acid soils, the mobility of Al increases sharply and it actively competes with other cations for exchangeable situation, because soluble Al, such as most Ex-Al fractions, is the most chemically and biologically available form for plants . Generally, the Al fractions derived from mineral Al in soil solution can transform to Al 3+ and form corresponding complexes with phosphate or sulphate in acidic soils (Ruan et al 2000;Fung and Wong 2002;Wong et al 2003). Meanwhile, pH and CEC were correlated with Ec-Al, Or-Al, Hu-Al, Ex-Al and total Al in topsoil and subsoil, and all these results were observed by previous researchers (Dong et al 2001;Xie et al 2001).…”

Section: Discussionsupporting

confidence: 68%

“…The interplay between aluminum (Al) and nutrients in tea (Camellia sinensis L.) plantations is of scientific and social interest (Ruan et al 2006) since (1) tea plants are an Al-accumulating shrub (Dong et al 2001;Tolrà et al 2011) and commercially available tea contains large amounts of Al. A further 30-40% of Al could be absorbed into infusions and thus absorbed by tea drinkers (Flaten 2002); (2) a potential link between high Al contents in tissues and various neuro-degenerative disorders such as Alzheimer's disease has been reported (Nayak 2002); (3) soil pH and nutrients have been altered by atmospheric deposition with global environmental changes and fertilization due to productivity maintenance (Ruan et al 2000;Chen et al 2006;Wang et al 2010), this has affected the Al cycling in tea plantations (Fung and Wong 2002;Ruan et al 2004;Fung et al 2008;Duan et al 2012) and vice versa; for example, soil available Al promotes plants to absorb phosphate (Konishi et al 1985;Dong et al 2001;Debnath et al 2011).…”

Section: Introductionmentioning

confidence: 99%

“…Fung et al (2008) reported that the biomass of tea seedlings increased by 44% and 35%, when grown in solutions of 0.25 and 0.5 mM Al concentrations, respectively, compared with the absence of Al. On the other hand, it is a common and effective fertilization approach to include nitrogen (N) and phosphorus (P) additions to increase the yield and quality of tea (Bajaj et al 1984;Ruan et al 2000). It is also reported that soil Al levels and nutrient status generally increased, but soil quality and biological activity decreased with increasing age of tea plantations, due to unreasonable management practices (Dang 2007;Han et al 2007).…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Aluminum and nutrient interplay across an age-chronosequence of tea plantations within a hilly red soil farm of subtropical China

Fang¹,

Chen²,

Hu³

et al. 2014

Soil Science and Plant Nutrition

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Section: Discussionsupporting

confidence: 68%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Aluminum and nutrient interplay across an age-chronosequence of tea plantations within a hilly red soil farm of subtropical China

Fang¹,

Chen²,

Hu³

et al. 2014

Soil Science and Plant Nutrition

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“…In modern agriculture, large quantities of chemical fertilizers are applied to tea orchards annually to gain high economic benefits. However, nitrogen fertilizer in the rhizosphere soil of tea plant significantly reduced soil pH, while extractable Al levels grew [2,3]. The pH of long-term tea plantation decreased due to protons released from ammonium fertilizers preferentially for the growth [4].…”

Section: Introductionmentioning

confidence: 99%

Restoration of Long-Term Monoculture Degraded Tea Orchard by Green and Goat Manures Applications System

et al. 2019

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Tea is an economic shrubby plant in tropical and subtropical regions of the world. To obtain high yield in tea cultivation, chemical fertilizer application rates have generally been used. However, a large quantity of chemical fertilizer application in a long-term continuously ratooned and monoculture tea orchard can inevitably lead to soil acidification and a decline in fertility. Therefore, the restoration of soil fertility and the sustainable development of tea planting by organic ways are critical for the tea industry. In this study, field trials were conducted in the tea orchard that was continuously ratooned and mono-cultured for 20 years. Nitrogen fertilizer (NF), Laredo soybeans green manure (LF), and goat manure (GM) treatments were applied to restore optimum acidity, soil fertility, microbial activity, and the community structure of a long-term continuously monoculture tea orchard. This paper investigated that the pH value was increased from 4.23 to 4.32 in GM and LF, respectively. Similarly, the content of exchangeable acidity (EA) was decreased by 1.21 and 1.46 cmol·kg−1 in GM and LF, respectively. Available nutrient results indicated that the content of NH4+-N was increased by 3.96, 4.38, NO3−-N by 1.07, 2.16, AP by 3.46, 6.86, AK by 0.26, 0.3 mg kg−1 in GM and LF treatments, respectively. Enzyme analysis revealed that the activity of urease and sucrase was promoted by 7.98 mg·g−1·24 h−1 and 6.77 mg·g−1·24 h−1, respectively, in LF treatment. Likewise, the activity of acid phosphatase and polyphenol oxidase was sharply increased by 2.3 mg·g−1 h−1 and 63.07 mg·g−1 h−1 in LF treatments. Additionally, the activity of urease, sucrase, acidic phosphatase, polyphenol oxidase, and peroxidase were also significantly increased by applying GM treatments. Meanwhile, LF and GM treatments significantly improved soil microbial biomass as well as low weight organic acid content in degraded tea rhizosphere. Furthermore, high throughput sequence results illustrated that the relative abundance of Rhizobiaceae and Bradyrhizobiaceae families increased in LF and GM treatments, respectively, which are mostly a kind of nitrogen fixer and plant growth promoting bacteria. Taken together, the physiological traits of the new sprouts and the biochemical components of new tea leaves were also significantly improved by GM and LF treatments. From this study, it is concluded that LF and GM are good agriculture management practices, which promote plant growth, yield, and nutrient availability by maintaining and improving pH, enhancing available nutrients status, improving the secretion of low molecular weight organic acids, and balancing the microbial community structure in the long-term mono-cultured tea orchard.

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“…Since struvite solubility is strongly dependent on pH, such observation raises the question of whether manipulation of rhizosphere processes by stimulating rhizosphere acidification through NH 4 -N supply might be an effective approach to improve struvite solubility at the vicinity of roots. On the other hand, root-induced acidification in the rhizosphere of NH 4 -fed plants may increase the concentration of Al in solution [25], potentially resulting in toxicity for plants [26] and P precipitation as variscite, AlPO 4 •2H 2 O [27].…”

Section: Introductionmentioning

confidence: 99%

Fertilizer Potential of Struvite as Affected by Nitrogen Form in the Rhizosphere

et al. 2020

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Struvite is increasingly considered a promising alternative to mined phosphorus (P) fertilizer. However, its solubility is very low under neutral to alkaline pH while it increases with acidification. Here, we investigated whether supplying ammonium to stimulate rhizosphere acidification might improve struvite solubility at the vicinity of roots and, ultimately, enhance P uptake by plants. Using a RHIZOtest design, we studied changes in soil pH, P availability and P uptake by ryegrass in the rhizosphere and bulk soil supplied with either ammonium or nitrate under three P treatments: no-P, triple super phosphate and struvite. We found that supplying ammonium decreased rhizosphere pH by more than three units, which in turn increased soluble P concentrations by three times compared with nitrate treatments. However, there was no difference between P treatments, which was attributed to the increase of soluble Al concentration in the rhizosphere, which subsequently controlled P availability by precipitating it under the form of variscite-like minerals (predicted using Visual MINTEQ). Moreover, although ammonium supply increased soluble P concentration, it did not improve P uptake by plants, likely due to the absence of P deficiency. Further studies, especially in low-P soils, are thus needed to elucidate the role of nitrogen form on P uptake in the presence of struvite. More generally, our results highlight the complexity of manipulating rhizosphere processes and stress the need to consider all the components of the soil-plant system.

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Cited by 66 publications

References 20 publications

Aluminum and nutrient interplay across an age-chronosequence of tea plantations within a hilly red soil farm of subtropical China

Aluminum and nutrient interplay across an age-chronosequence of tea plantations within a hilly red soil farm of subtropical China

Restoration of Long-Term Monoculture Degraded Tea Orchard by Green and Goat Manures Applications System

Fertilizer Potential of Struvite as Affected by Nitrogen Form in the Rhizosphere

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