Environmental Problems From Tea Cultivation in Japan and a Control Measure Using Calcium Cyanamide

Oh, Kwang-Soo; Kato, Tadashi; Li, Zhongpei; Li, Fayun

doi:10.1016/s1002-0160(06)60113-6

Cited by 59 publications

(40 citation statements)

References 24 publications

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“…al., 1990, Tee et. al., 1987 Long-term tea cultivation even caused serious soil acidification (77% of 70 tea fields having pH below 4.0) as a consequence of heavy nitrogen (N) application (Oh et. al., 2006).…”

Section: Effect Of Farming System On Soil Phmentioning

confidence: 99%

Journal of Sustainable development, Vol. 1, No. 3, November 2008, all in one file

JSD¹

2009

JSD

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Section: Effect Of Farming System On Soil Phmentioning

confidence: 99%

Journal of Sustainable development, Vol. 1, No. 3, November 2008, all in one file

JSD¹

2009

JSD

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“…On the other hand, in terms of environment sustainability, green tea is one of the highest nitrogen (N) pollutant emitters to water bodies among land use categories in Japanese agricultural watersheds due to intensive use of N fertilisers (Nakasone et al, 2002;Oh et al, 2006). N application rates as high as 2500 kg N ha -1 year -1 was once applied to green tea crop (Oh et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

“…N application rates as high as 2500 kg N ha -1 year -1 was once applied to green tea crop (Oh et al, 2006). In contrast, paddy fields and their associated irrigation systems possess abundant environment multifunctionality roles that include water purification, flood mitigation, water resources fostering, soil erosion prevention and biodiversity conservation (Matsuno et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

Robust optimal model for sustainable joint production of green tea and paddy rice in Japanese agricultural watersheds

Mabaya

Unami

Takeuchi

et al. 2017

IJISD

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Abstract:In Japanese hilly agricultural watersheds, green tea is a profitable crop, whereas paddy rice cannot endure without subsidies. Environmentally, green tea plantations are the highest nitrate pollutant emitters to water bodies, whereas paddy fields are the most significant nitrogen sinks. This study investigates the effectiveness of diverting nitrate-contaminated drainage water from upland tea fields to the lowland paddy fields, in terms of reduction of downstream pollution and rice production cost, using the robust optimal model. The model optimally maximises diversions to reduce nitrate pollution to the adjacent rivers, and is environment risk averse to possible malfunctioning denitrification processes in the respective paddy fields. The application shows increased diversions to paddy fields during the rice growing season, thereby facilitating rice plants to have optimal access to substantial amounts of nitrogen nutrients and water. Thus, the robust optimal model has the potential to support sustainable joint production of the two crops.Keywords: robust optimisation; sustainable production; green tea; paddy rice; agricultural drainage water; nitrogen pollutants.Reference to this paper should be made as follows: Mabaya, G., Unami, K., Takeuchi, J., Fujihara, M. and Yoshioka, H. (2017) 'Robust optimal model for sustainable joint production of green tea and paddy rice in Japanese agricultural watersheds ', Int. J. Innovation and Sustainable Development, Vol. 11, No. 1, 70 G. Mabaya et al.Biographical notes: Goden Mabaya, MSc (Water Science and Engineering) 2012 UNESCO-IHE, Netherlands, is a PhD student in Water Resources Engineering at the Graduate School of Agriculture, Kyoto University, Japan. He has an extensive technical experience in planning, designing, construction and water management of multiuser irrigation and drainage systems in Africa. His research interests are robust optimisation of integrated agricultural watershed management with an emphasis on environmental sustainability, environmental water quality management, and post-modernisation of irrigation and drainage systems.Koichi Unami, PhD (Agriculture) 1998, Kyoto University, is an Associate Professor at Graduate School of Agriculture, Kyoto University, Japan. His research topics include theories and practices of water resources and environment management in rural areas, with specific emphasis on robustness in decision-making under uncertainty. For example, he determines operation rules for irrigation dams with irregular occurrence of recharge events in the framework of stochastic control. He is also an expert in field studies with different agro-ecological climates in Asia and Africa, such as Lake Biwa Basin of Japan and Volta Basin of West Africa.Junichiro Takeuchi, PhD (Agriculture) 2010, Kyoto University, is an Assistant Professor of Water Resources Engineering at Graduate School of Agriculture, Kyoto University, Japan. His main research interests include fluid flow and solute/energy transport through porous media and environmentally so...

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“…Plantations of tea accelerate soil acidification, and acidification degree of tea garden soils increased with cultivation time (Abe et al 2006, Oh et al 2006, Wang et al 2010). An acidic environment is favorable for tea plant growth, but if soil pH is too low and levels of aluminum (Al) are high there can be negative impacts on tea plants (Fung et al 2008); a range of suitable pH for tea plants is 4.5-6.0.…”

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confidence: 99%

“…An acidic environment is favorable for tea plant growth, but if soil pH is too low and levels of aluminum (Al) are high there can be negative impacts on tea plants (Fung et al 2008); a range of suitable pH for tea plants is 4.5-6.0. Ammonium (NH 4 + )-N fertilizers applied to increase tea yields accelerate soil acidification through the nitrification of NH 4 + (Ruan et al 2004, Oh et al 2006. Tea plants are known to be typical Al accumulators and can take up large amounts of Al, most of which accumulates in leaves.…”

mentioning

confidence: 99%

Proton release by tea plant (Camellia sinensis L.) roots as affected by nutrient solution concentration and pH

Wan¹,

Xu²,

Li³

2012

PLANT SOIL ENVIRON

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Solution culture experiments were conducted and the protons released were measured with an automatic titration system to determine the main factors affecting proton release by tea roots. Results indicated that the higher were the cation concentrations, the more protons were released from the roots, suggesting that tea roots took up a large amount of cations during growth, and then released protons to maintain charge balance of the plant body. The amount of protons released from tea roots at controlled pH was much higher than that in the treatments with uncontrolled pH. Stepwise multiple linear regression analysis showed that both NH 4 + and Al(III) played distinct roles in proton release by tea plant roots. The uptake of Al(III) and NH 4 + and subsequent release of protons may be an important mechanism for soil acidification in tea gardens.

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Environmental Problems From Tea Cultivation in Japan and a Control Measure Using Calcium Cyanamide

Cited by 59 publications

References 24 publications

Journal of Sustainable development, Vol. 1, No. 3, November 2008, all in one file

Journal of Sustainable development, Vol. 1, No. 3, November 2008, all in one file

Robust optimal model for sustainable joint production of green tea and paddy rice in Japanese agricultural watersheds

Proton release by tea plant (Camellia sinensis L.) roots as affected by nutrient solution concentration and pH

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