EFFECT OF RAINFALL VARIATION DUE TO ENSO ON TEA PRODUCTIVITY IN WEST JAVA (Case Study: Bandung Regency) Rahmatika, Joko Wiratmo
Faculty of Earth Science & Technology
Bandung Institute of Technology
Email: joko.wiratmo[at]meteo.itb.ac.id
Abstract
The purpose of this study was to determine the effect of rainfall variations due to ENSO on tea productivity in West Java with case study Bandung regency using monthly rainfall data from 2003-2020, tea production from 2003-2020, and Nino index 3.4. The used method are FFT (Fast Fourier Transform), Butterworth Bandpass Filter, and correlation. To see the effect of ENSO on tea products in the study area, it was used BBF in the cut off 3 and 7 years.
Rainfall pattern in Rancabali, Pasirjambu, Pangalengan and Kertasari (RPPK) district is monsoon. Power spectrum analysis shows that interannual pattern (ENSO) is one of the factors that have an impact on rainfall variations with different levels. The lowest negative correlation occurred in Rancabali and Pasirjambu districts with consecutive values of -0.085 and -0.063 while for Pangalengan and Kertasari districts had a positive correlation of 0.030 and 0.027. Then, the effect of rainfall variation due to ENSO on tea productivity has a low negative correlation for each RPK namely -0.023, -0.053, -0.137, and -0.239.
