stakeholders such as farmers, collectors, retailers,
cassava processing industries, distributors, retailers
and consumers about the situation or reality that
occurred in the field, the more the number of
respondents then the data obtained will be more valid
a. Sampling method
The sampling method was done by snowball
sampling, the sampling was done gradually, the
first thing to do was to determine the key
informant in the cassava farmer who can give
information and this person also used as informant
to identify other person as sample which is
considered can give information. Based on
snowball sampling method obtained 48
respondents which consist of 30 farmers, 10
middlemen, 7 retail traders and 1 tapioca industry.
b. Data analysis
Value chain analysis refers to a series of activities
required to present a product or service starting
from a conceptual stage, followed by several
stages of production, to delivery to end-
consumers and destruction after their use
(Kaplinsky & Morris, 2000).
c. Value chain mapping
Identify each part of the production process and
identify where steps can be eliminated or
improved. Improvements made aim to cut
production costs or increase productivity (Porter,
1985).
d. Value chain analysis
This analysis aims to identify opportunities for
value enhancement on the value chain map.
Improved value chains can be performed on
various sides such as processes, products,
resources and functions. Value chain
improvements aim to improve efficiency, product
diversification, resource optimization and
establish the most important activities in the value
chain.
3 RESULT AND DISCUSSION
3.1 General Overview of the Study
1. Location and geographical state
Toba Samosir is a regency in North Sumatra
Province with Balige as its capital. Toba Samosir
Regency consists of 16 districts and 244 sub-
districts. Toba Samosir Regency covers an area of
2,021.80 km
2
and is located between 2°03' and
2°40' North latitude and between 98°56' and
99°40' East longitude.
2. Social economic and environmental policies
According to Toba Samosir's central statistics
agency in 2014, over the past three years
economic growth in Toba Samosir has always
been positive. In 2013 the amount of GDP per
capita Toba Samosir district reached Rp 28.24
million with an increase rate of 12.36%. Tobacco
PDRB contributes 1.24% to the formation of
GRDP of North Sumatra. The large population of
Toba Samosir Regency depends on the
agricultural sector. Agriculture becomes the
mainstay sector for Toba Samosir Regency in
moving the local economy. In 2016 this sector
contributed significantly in the formation of
GRDP Regency Toba Samosir, which is about
34.93%. Toba Samosir regency is one of
producing centers of rice, corn, cassava, and
andaliman in North Sumatra.
3. Production and productivity of cassava in Toba
Samosir district
Production of cassava in Toba Samosir Regency
fluctuated where there is a decrease or increase in
the number of production each year. Based on
data obtained from BPS in 2005-2016 shows that
the production of cassava in Toba Samosir
Regency has a positive trend and move
exponentially. The exponential movement means
that cassava production will increase
continuously. In 2010-2012 a significant increase
in cassava occurred due to the presence of a
tapioca starch factory in Toba Samosir Regency,
PT Hutahaean. However, in 2012-2014 cassava
production has decreased very sharply. This
happens because of the prolonged dry season that
occurred in 2013-2014. While the productivity of
cassava in Toba Samosir Regency has a positive
trend and experienced a linear growth, this means
that cassava productivity will increase in the long
term. Increased productivity of cassava in Toba
Samosir District is caused by several factors
among others the use of superior seeds and the
increasing ability of the community in processing
cassava farming.
3.2 Supply Chain Mapping
According to (Chopra & Meindl, 2001) the supply
chain consists of all parties involved, directly or
indirectly, to meet customer demand. Based on data
that have been collected from the interview and
observation obtained 3 models of supply chain of
cassava commodity in Toba Samosir Regency (Fig.
1).