research area. This research only considers three types of rice variety which is dominant in the research area, meanwhile in the field farmers not only planted
Ciherang, Cilamaya Munjul, and IR64 rice variety.
4.4 Rice Planting Rotation
The temporal EVI images show the difference of planting date in research location. From the EVI temporal pattern, the planting and harvesting date were
rotating starting from the south area towards north of the area see figure 4-6. Figure 4-6 shows the EVI value in research area where the white color represent
the panicle initiation phase of rice plantation where rice leaf is at the greenest color phase. Through the time white color are shifting from south area towards
north area or in other word that the planting rotation were started from the south and then shifting to the north. In figure 4-7, rice ages in research area were able to
be determined based on EVI value through time. Rice age were identified by growing phases of rice plantation that consist of pre-flooding phase, germination
phase, tillering phase, panicle initiation phase, flowering phase, and harvesting phase. The figure also describes the planting rotation of rice through time shifting
from south towards north. The type of rice field in the research location were dominated by irrigated rice field which causing that the planting and harvesting
date moving towards north through time were the irrigation water started from the south region.
Each EVI classes then were examined to determine the growing season of rice for each class as a base for generating a crop calendar. Growing seasons of
rice were varied according MODIS EVI temporal pattern. The variations ranging from 96-128 days and for each class there is a rotating days of planting pattern
ranging from 16-48 days where the changes are moving backwards according to number of classes see figure 4-8 and table 4-5.
Figure 4-6. Time series EVI images showing the movement of planting and harvesting time red line showing the boundary of rice field and non-rice field
