Agriculture Reference
In-Depth Information
Fig. 4.9
NDVI images for 1991, 1992, 2001, 2002, 2005, and 2006
3. However, concentration of Mn in soil as well as groundwater is significantly
higher and has higher potential to influence human and plant health. Further-
more, Hettiarachchi and Gupta (
2008
) observations of Mn toxicity of tea planta-
tions in the area, especially during the dry weather conditions justify the result.
4. Lead concentration in groundwater is significant. Even though, heavy metals
such as Cu, Ni, Fe and Zn in groundwater are not significant.
5. According to supervised classification, reductions of paddy fields were observed
over a period of 13 years starting from 1992 to 2005. On the other hand, total
vegetation cover has increased. However, pixel overlapping limits the applica-
tion of remotely sensed data for the tea plantations.
6. Further relationship between annual yield and NDVI was not significant and there-
fore further studies are required to identify the relationship between reflection char-
acteristic of tea plantation with its yield. Though NDVI is unable to explain the
annual yield data, it is important to investigate its potential for shorter timeframes.
Acknowledgements
Authors acknowledge the facilities provided in School of Environmen-
tal Sciences, Jawaharlal Nehru University for the experimental and interpretation work for this
chapter.
References
Annual report (2009) Central bank of Sri Lanka
Anon (2003) Agricultural profile of corporate tea sector, Tea research institute of Sri Lanka, Ta-
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Balasuriya J (1999) Shoot population density and shoot weight of clonal tea (Camellia sinensis) at
different altitudes in Sri Lanka. Eur J Agron 11(2):123-130
