Tabela Systems for Sustainabilty Agriculture in Northern of
Sumatera
Ameilia Zuliyanti Siregar
1*
, Rahmat Widia Sembiring
2
, Lusiana Andriani Lubis
3
and Fachri Yunanda
4
1
Departement Agrotechnology, Faculty of Agriculture, Universitas Sumatera Utara
2
Department Management Information, Polytechnic Negeri Medan
3
Department Communication, Political and Social Sciences, Universitas Sumatera Utara
4
English Education Department, Faculty of Teaching and Education, Universitas of Prima Indonesia
Keywords: Tabela, Sustainability, Agriculture, Atabela, Sumatera.
Abstract: In irrigated wetland agro-ecosystem, the sowing of rice seeds is carried out directly on the condition of the
ground not waterlogged. Direct seed planting system (called ‘Tabela’) is the planting of rice plants without
going through the nursery and removal of seedlings. Cultivation of direct rice seed crop categorized into 2
sections, such as: scatter (sonor/brodcast) where the seeds are sown evenly, while the Tabela array with the
drum seeder spaced 25 cm between rows. The result shows that technology have the comparative advantage
than transplanting method in rice cultivation. Adoption of direct seeded rice influenced significantly by land
ownership, cost of planting and maintenance, planting season, researcher or extension worker guidance and
location. Based on the result, the Tabela technology is suitable to be developed in the region where there is a
shortage of agricultural labor occurs. It reduces labor and cost for planting and maintenance which increase
income of the farmers. However, the socialization of direct seeded rice technology is still needed guidance
from researcher and extension workers. The characteristics of farmers influence in receiving information from
agricultural extension workers, such as through interpersonal communication through agricultural extension
visits to individual farmers, group communication through plot demonstrations, and also through mass
communication through brochures, posters, leaflets, manuals and electronic media (television, radio, internet).
1 INTRODUCTION
Rice demand will continue to increase along with
population growth rate. Based on the realization of
paddy production in the last 5 years, it is indicated
that the growth rate of rice production is decreasing
and production cost per unit of land is increasing.
Therefore, the achievement of rice production target
in the future will be more difficult. To overcome this
problem, the Government is aiming to increase the
national rice production by 2015 by 1.5% per year. In
this context, various breakthroughs of rice production
are needed.
In general, Tabela is defined as one way planting
or cultivation of crops by spreading the seeds directly
in the cultivation area or planting crops that are not
through the nursery so that none exists transfer of
seedlings to planting areas (Haryadi, 1985 and
Bismar, et al., 1985). Practice of Tabela in rice
farming in Indonesia has actually been done before
the farmers the existence of tandur jajar system or
planting move. But at that time it did not develop
because of various constraints (Supriadi and Malian,
1995).
Along with the development of science and
technology, Tabela system again made an alternative
in rice farming because it is considered more
efficient. Some countries in Asia have changed the
way rice cultivation from moving plant systems
(Tapin) to Tabela system. Factors that have motivated
farmers to apply Tabela's technology Asia, among
others, due to the onset of environmental changes in
farming, ie improved irrigation system, availability of
short-lived, high-yielding rice varieties, herbicides
effective and inexpensive, and rare and expensive
workforce (De Datta and Nantasomsaran, 1991).
In the Philippines and Malaysia, these cultivation
techniques change to 27 percent and 99 percent of the
total area of rice cultivation and has been ongoing
since 1987 Thailand (mainly in the North and
Siregar, A., Sembiring, R., Lubis, L. and Yunanda, F.
Tabela Systems for Sustainabilty Agriculture in Northern of Sumatera.
DOI: 10.5220/0010046005290535
In Proceedings of the 3rd International Conference of Computer, Environment, Agriculture, Social Science, Health Science, Engineering and Technology (ICEST 2018), pages 529-535
ISBN: 978-989-758-496-1
Copyright
c
2021 by SCITEPRESS Science and Technology Publications, Lda. All rights reserved
529
Northeast), the proportion of the Tabela system in
business rice farming reached more than 80 percent
(Isaranurak, 1995). Similarly with di Japan, where the
proportion of Tabela to the entire area of rice farming
is experiencing development from about 8 percent in
1973 to 30 percent in 1990 (Osamu, 1995). In South
Korea, cultivation of rice by way of transplanting the
already moved using tools and cultivation machines
have also begun to shift to the application of
cultivation spread directly.
Although the production of rice in North Sumatra
throughout 2017 reached 5.1 million tons or a surplus
of 1.7 million tons of the calculated demand of 3.4
million tons. This number increased compared to the
previous year. With this surplus, surely we are over
production and then sent to other areas such as Riau
province and others who need it, "said Azhar
Harahap, head of Food Crops and Horticulture of
North Sumatra.To 2018, North Sumatra Provincial
Government targets to increase rice production to 5-
10 percent compared to 2017.
Given the important functions and roles of the
paddy, the Government seeks to realize increased rice
production by 2015 through the Integrated Crop
Management (GP-PTT) and Other Special Efforts
(Upsus) Movement. In relation to this, program
implementers in the field need guidance for various
rice cultivation technologies that have been
developed in Indonesia, especially the technology of
Rice Cultivation Seeds Direct (Tabela) which adopt
local wisdom in North Sumatra.
1.1 Definition of Planting Seed Direct
(Tabela)
Direct seed planting technology (Tabela) Tabela rice
has several advantages, such as shortening the period
of rice production so as to increase the index of crops
and reduce labor costs for planting. Tabela
technology can be applied to irrigated wetland
agroecosystem, rainfed lowland, and tidal land. In
general, Tabela applies the approach model of
Integrated Crop Management (PTT). Tabela's
specialty is not to plant transplants but the seeds are
sown directly.
The consequence of Tabela is that the land
requires different soil treatment and water
management with the land for transplanting plants.
Tabela is suitable to be applied in labor-less areas,
short wet season, and irrigation water can be
arranged. The most suitable location for the
application of Tabela is agroecosystem of technical
irrigation rice fields. However, in tidal, dryland and
rainfed lowland agro-ecosystems it can also be
applied on condition that water management and land
preparation are done in particular.
In Tabela there is no making of nursery and move
planting so it requires less labor. Directly planted rice
will reach the generative stadia faster, shortening the
rice production period and increasing the crop index.
In areas with limited rainfall periods, Tabela rice
cultivation may be avoided from drought or provide
opportunities for cultivation other food crops.
Potential areas to implement Tabela include West
Nusa Tenggara, East Nusa Tenggara, Kalimantan,
Sumatra and Papua. Tabela is potentially developed
with modern mechanization on a wide scale so as to
increase productivity. Tabela technology as a
reference for field officers, extension workers,
farmers, and other users, consists of guidance on the
implementation of the land to post-harvest handling.
Tillage consists of selection of varieties and seeds,
seed treatment, soil preparation, seed sowing,
irrigation, weeding, fertilization, controlling plant
pest organism (Pest), harvesting and post harvest
handling.
Seed distribution technology evenly on the
planting area is able to decrease the labor flow by
about 28% (Hazairin and Manalu, 1993). But the
main disadvantages of applying this method is the
need for 2-3 times more seeds, as well as harvesting
constraints due to the lack of spacing. The cultivation
of direct seeding in the run does not significantly
change the way the cultivation has been done so far
because it keeps using the array with the spacing
between the rows between 22-25 cm, depending on
the varieties grown. The seed requirement in this way
ranges from 50-60 kg / ha, or between 1.5-2 times
compared to transplanting plants (Supriono and
Milan, 1993).
Some improvements in the application of direct
seeding in the run were done and found Tabela
Legowo, rice planted in 4-6 rows, emptied 1 row
planted again, 4-6 next row and so on. Research
results from 1992-1994 in Balittan Sukamandi
showed that two-line Legowo Tabela is the best,
because rice production does not decrease, during rice
growing season. How to cultivate the soil in the
cultivation of Tabela rice in principle is the same as
the cultivation of transplanting plants. To get the
optimal result required perfect soil processing. Deep
soil processing will accelerate the growth of plants so
that plants do not easily fall on generative stadia. The
surface of the soil should be evenly so that the water
level can be controlled (Supriadi and Malian, 1993).
The technique of planting Tabela by using
Atabela cultivation tools does not require a nursery as
in moving cropping techniques. The seeds are
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Technology
530
instantly soaked for 24 hours then dried for 12-14
hours and directly planted in the run. Seeds are used
around 40 kg / ha while transplanting plants (taping)
is only 25 kg/ha.
When compared between the use of planting
ways to move by planting Tabela, then the ways of
planting Tabela will provide several advantages,
among others: Labor costs outside the harvest 25-30
percent lower, The cost of production means is 5-10
percent lower, The yield per hectare is 10-25 percent
higher and the price of both grain and rice is higher
(due to better quality) and Farmer net income
increased from Rp. 1.2-1.5 million/ha/ season to Rp.
2.0-2.5 million/ha/season (Adnyana et al, 1997) (click
the link below to read directly from the source.
2 RESEARCH METHODOLOGY
The research was undertaken on Direct Seeded Rice
technology (Tabela) performance, particularly to test
relevant factors affecting adoption of direct seeded
rice. It was conducted in Langkat and Deli Serdang
districts, consists of 2500 meter. The primary data
collection is done through interviews with list
assistance question (questionnaire) includes two
growing seasons ie dry and wet seasons 2016/2017
year. To enrich the discussion, the description is
equipped with secondary data from various related
institutions. From the data, the resu;ted presentation
into description and figure below.
Figure 1. Inpari 20 varieties using Tabela (Source: South
Sumatera AIAT, 2014)
3 RESULTS AND DISCUSSIONS
3.1 Seed
3.1.1 Selection of Varieties and Seeds
Rice varieties used are high yielding varieties that
have small number of tillers and are heavily neglected
to prevent pests and diseases caused by high plant
populations. Agro ecosystem of irrigated fields using
superior varieties include Inpari 6, Inpari 9, Inpari 10,
Inpari 13, Inpari 19, and Inpari 24. Agroecosystem of
rainfed lowland uses Inpari 13, Batutegi, Situ
Patenggang, Situ Bagendit, and Mekongga.
Agroecosystem of dry land using Inpago 8, Inpago 9,
Batutegi, and Situ Patenggang. Tidal agroecosystem
using Indragiri, Mendawak, Banyuasin, Inpara 4,
Inpara 8, Inpara 9, Inpari 20 (Figure 1), and Inpari 30
Ciherang sub1.
The seed of good quality and certification
guarantees high vigor, uniformity of growth,
pathogen-free and seeds, weeds, and not mixed with
other varieties. Seed requirement on a Tablet
(broadcast / sonor) system of 60-80 kg / ha, while
Tabela in sequence and ATabela (drum seeder)
require seeds 30-45 kg / ha.
3.1.2 Seed Treatment
Seed treatment aims to get pithy seed so as to produce
a healthy plant. Pithy seeds are selected using a 3%
salt solution or 30 grams of kitchen salt per liter of
water. Seeds that float at the time of submersion are
dumped and the drowning is the pithy seed that will
be sown. Selected seeds are soaked in clear and clear
water for 1x24 hours, then drained and immersed for
1x24 hours until the seeds begin to grow (Figure 2).
The incubation is done by spreading the seeds over
the tarpaulins evenly and then covered with a sack or
a damp cloth. Tabela on dry land does not require
soaking and curing of seeds. In the endemic areas of
blast disease and Bacteria Leaf Blight (HDB), before
sowing the seeds are treated with systemic pyroquilon
or agrepdeng with 5-10 g / kg doses of seeds by way
of soaking or coating.
Figure 2. Seeds begin to grow ready to sow (Source:
Suwarno, 2014)
Tabela Systems for Sustainabilty Agriculture in Northern of Sumatera
531
4 LAND PREPARATION,
SOWING AND MAINTENANCE
4.1 Land Preparation
Irrigation field irrigation agroecosystems are
subjected to perfect cultivation, covering singkal
(wet) piracy or piracy (renewal), renewal, and land
leveling measures. Wet-treated land is left for 1 week
after hijacking with a water depth of 10-20cm. The
cultivation is carried out by using the new / 'gelebeg'
1 week before land smoothing (Figure 3). After
flattening, water is added agartanah moist so the land
ready to sow. Prevention of standing water when
sowing on the Tabela system plot is done by creating
a worm channel surrounding the paddy fields and
caren in the paddy field. Tabela technology in the
array (ATabela) does not require caren in the map.
Irrigated rice paddies and rainfed rice fields with
dry land, are pirated and renewed evenly. At the time
of renewal can be added organic material in the form
of compost or manure 2 ton / ha.Lahan left for 1 week
then put water until soil moist and ready to sow.
Typical B type tidal agroecosystem is done though
wet soil or dried soil using hand tractor with plow
depth less than 20 cm. Grounding is done 1 week after
first tillage. The making of aqueduct (canal)
surrounds the plot of land for micro-water
Figure 3. Garu / gelebeg pulled hand tractors in irrigated
fields (Source: Firmansyah, 2014)
4.2 Sow the Seeds
In agro ecosystem of irrigated rice sowing is done on
the condition of moist soil or not waterlogged. Tabela
scatter (sonor / broadcast), seed sown evenly (Figure
4), while Tabela array with drum seeder spaced 25 cm
between rows (Figure 5).
Figure 4. Sow seed (sonor / hambur) (Source: Zarwazi,
2013)
Figure 5. Sow seeds with drum seeder (Source: Zarwazi,
2008)
Seed sowing in rainfed agroecosystems avoids
rainfall, whereas in type A tidal agroecosystems it is
done by sowing (sonor) followed by sowing of husk
ash. Tidal type B is done by seed sower (seed blower).
4.3 Irrigation
In irrigated wetland agro ecosystem, the land is
kept moist and not stagnant for 10 days after sowing.
Furthermore, the water is fed with a depth adjusting
the height of the plant to a maximum depth of 5 cm.
Where possible irrigation can be made. Type-T-type
tidal agroecosystem, carried out with micro water
management using a folder system.
4.4 Weeding
Figure 6 described the weed control is done
mechanically and chemically. Glyphosate-based
active herbicides were applied before tillage to kill all
weeds. Selective pre-growth herbicides (pre
emergence) are used at 3 days after seed sowing
(DASS). Post-emergence selective herbicides are
used at the time of 14 HSTb or when weeds are 2-4
strands. Tabela Lam and ATabela, in addition to
using weed control chemistry methods can also be
ICEST 2018 - 3rd International Conference of Computer, Environment, Agriculture, Social Science, Health Science, Engineering and
Technology
532
done by manual or tool, such as gasrok (rotary
hedgehog) and power weeder machine at the age of
less than 21 DASS.
Figure 6. Weeding weeder (Source: Firmansyah-BB Rice,
2014)
4.5 Fertilization
Basic fertilizer application is done on 5-7 HSTb by
using NPK fertilizer of 200 - 250 kg / ha. Fertilization
of urea follow-up based on leaf color (BWD) reading
done every 2 weeks (Figure 7).
Figure 7. Leaf color chart (BWD) reading (Source: ICRR,
2014)
4.6 Pest Control
Monitoring/monitoring of pest populations was
conducted 2 weeks before planting using light trap
(lighttrap). Trap lights are installed at a distance of
15-20 m from the paddy field (Figure 10). Control is
carried out according to the recommendation of
Integrated Pest Management (IPM) by considering
the economic threshold and the use of pesticides as
recommended.
Insecticide granular active ingredient carbofuran
amounting to 20 kg / ha is used in conjunction with
the basic fertilization time. Rice borer endemic area
using insecticide granules active ingredient
carbofuran dose 17-20 kg/ha or spinetoram (dose
300ml/ha), rynaxypyr (500 ml / ha), tiametoxam +
rynaxypyr (dose 250 ml / ha), and dymehipo (dose
600 ml / ha). Endemic areas of brown stems and white
leafhoppers used insecticides with active ingredients
of dinotifuran (1 mg/l concentration) or pymetrozine
(0.5 g / l concentration). Trap Barrier System (Fig 8)
full protection and massive gropyokan / fumigation
(Figure 9) were performed in mouse endemic areas 2
weeks before and after sowing. Linear Trap Barrier
System (LTBS) (Figure 10) is used to control rat
migration.
Figure 8: Trap Barrier System (TBS) (Sumber: Anggara,
2012)
Figure 9: LinearTrap Barrier System (Sumber: Anggara,
2011)
Figure 10: Fumigasi dan penutupan (LTBS) & pemasangan
bubu perangkap & pemasangan bubu perangkap lubang
pasca fumigasi (Sumber: Anggara, 2013).
Tabela Systems for Sustainabilty Agriculture in Northern of Sumatera
533
5 HARVEST AND HANDLING
PASCAPANEN
Harvesting is done at the time of physiological rice
cooking, with characteristic 95% of paddy grass is
yellow. The rice harvest is manually done using a
jagged sickle and a thresher (Figure 11) or
mechanically using a harvesting machine (Figure 12).
The harvested grain is dried with a drying thickness
of about 5 cm and a reversal every 2 hours until the
moisture content reaches 12-14%. Drying rice can
also be done by using a sprayer tool.
Figure 11. Persiapan merontok gabah dengan combine
harvester (Sumber: Firmansyah, 2015)
Figure 12: Panen padi dengan power thresher (Sumber:
Rahardja, 2014)
5.1 Local Wisdom Communications
Extension Tabela in North Sumatra
Increased national rice production today is based on
efforts to increase productivity due to the expansion
of areas on new lands facing various technical and
socio-cultural constraints. Characteristics of farmers
influence in receiving information from agricultural
extension workers, such as through interpersonal
communication through agricultural extension visits
to individual farmers, group communication through
plot demonstrations, and also through mass
communication through brochures, posters, leaflets,
manuals and electronic media (television, radio,
internet). These communication forms are expected to
accelerate the adoption process of location-specific
agricultural innovations to support farming as well as
TABELA (Norvasion, 2013). However, among the
three forms of communication, interpersonal
communication is the most appropriate and effective
form of communication in terms of changing
knowledge, opinions, beliefs, attitudes and behavior
of farmers/communicants (Far, 2009).
Furthermore, the mastery of land resource
technology, in this case TABELA in principle is a
local wisdom that must be preserved from the
farmers. Therefore, the mastery of information and
agricultural innovation is needed by farmers so that
the local wisdom is not eroded by social, economic
and cultural factors. Farmers must have the character,
among others, capable of high competitive, superior
and competitive products, environmentally friendly,
integrated with other sectors and meet market demand
(Suwanda, 2008).
In addition to that, the role of specialist
agricultural extension workers (PPS), agricultural
extension workers (PPM) and agricultural field
extension (PPL) is a matter that must be optimized so
that the extension process to farmers in groups
(farmer groups) run effectively in the understanding
of information the same between each group member
in the acceptance of new information or innovation.
The effectiveness of counseling communications will
give maximum results if implemented in a sustainable
manner. In fact related to this, the government
through the Ministry of Agriculture has launched a
program of institutional development of farmer
groups that received an intensive and continuous
guidance from the government (Lubis, 1999).
6 CONCLUSION
The farmers' opportunity to apply (continue) the
Tabela system is influenced by: (a) planting and
maintenance costs, (b) escort by agricultural
researcher extension, (c) season cropping, (d) the size
of the laban's ownership, and (e) the location.
Opportunity of farmers to continue Tabela tend to be
higher with the increasingly high wages of workers
for planting activities and maintenance. Similarly, the
presence of escort researchers/agricultural extension
will encourage farmers' opportunities to apply
Tabela. The chance of Tabela's success is likely to be
higher in the dry season as well carried out on the
condition of land that irrigation is relatively good.
ICEST 2018 - 3rd International Conference of Computer, Environment, Agriculture, Social Science, Health Science, Engineering and
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534
This is possible related to the type of rice varieties
easy to fall down.
The policy implications of these findings are:
First, Needed improvements to the superior varieties
of bam suitable for the Tabela system (such as fall
down). Second, Atabela needs to be designed with
due regard to local laban conditions. Third,
considering the cost of planting and maintenance
(wage labor) is one factor determinants in adopting
the Tabela system, application of Tabela is suitable to
be prioritized its development to wilayal1 where there
is a shortage of agricultural labor (farmers).
Implementation of the Tabela system in these areas
will suppress the need work force, which in turn will
reduce the cost of meaningful farming increase
farmers' income. Fourth, development requires
Tabela support/guidance/escort from
researcher/extension farmer due to socialization
Tabela technology is still relatively bam. and it turns
out from the results of this factual analysis still
remains determinant for farmers to adopt the Tabela
system
REFERENCES
Adnyana, M.O., K. Kariyasa, B. Rahmanto, F. Sulaiman, C.
Muslim, A. Asikin, and Y.m Marisa. 1997. Study
Impacts on Agribusiness Development of Commodities.
Central Report Research So Agricultural Economics,
Bogor.
Anonymous. 1996. Aspect of cultivation and development
of direct seed rice planting. Seminar on Analysis of Rice
Based Farmers System (SUTPA). Cisarua 2-4 April
1996. Agricultural Research Agency. Puslitbang
Pertanian. Rice Research Institute Sukamandi. Subang.
Anwar, K., Andriati, A. Ruhnayat, Kendriyanto and
Purwati. 1993. Prospect of Rice Planting Spread
Directly at Laban Irrigation. Field Visit Report Report
on Training Development Research Methodology and
Procedures. Date April 26 - May 22, 1993. Agricultural
Research Agency.
Bismar, S., S. Sankaran and S. Palaniappan. 1991. Direct
Seeding Practices in India. In: Direct Seeded Floded
Rice in Tropics. IRRI. Manila, Phillipines.
De Datta and Nantasomsaran. 1991. Status and Prospect of
Direct Seeded Flooded Rice in Tropical Asia. Direct
Seeded Flooded Rice in The Tropics, IRRI, Philippines.
Far R A F. 2009. Relationship of Interpersonal
Communication Effectivity with Behavior of Rice Field
Farming (Case of Waimital Village of Kairatu Sub-
district of West Seram District Thesis Bogor
Agricultural Institute: Bogor.
Gurning, T.M. 1995. Direct spread of rice cultivation. Rice
Research Institute Sukamandi. Subang.
Haryadi, S. 1985. Introduction to Agronomy. IPB. Bogor
Hazairin and M. Manalu. 1993. Rice Field Cultivation with
Direct Spread Cam (Direct Seeding), Bah Bolon
Project. Cooperation between Indonesia and Australia.
Isaranurak, S. 1995. Thailand Agricultural Systems.
Ministry of Agriculture & Cooperatives. Bangkok.
Lubis, Lusiana Andriani. 1999. Decision Making
Regarding Transfer of Rice Technology Continues In
The Barisan in North Sumatra. Thesis (S2). USM:
Pulau Pinang.
Malian, A. H., A. Supriatna and H. Supriadi. 1995.
Economic Feasibility of Rice Cultivation Spread
directly on the North Coast of West Java. In Zaini, et al
(Editor). System Food Crops-Based Farming.
Comparative and Competitive Advantages. 74 Minutes
of Seminar on Research Results of Farming and Socio-
Economic System. Bogor. 4-5 October I994. Center for
Food Crops Research and Development. Bogor.
Noor, E.S. 2008. Acceleration of rice planting with Tabela
system in the tertiary area of irrigation reservoir of the
sublime forest. Proceedings of National Seminar of
Paddy 2008. Sukamandi.
Norvasion K. 2013. Communication Effectiveness of
Integrated Crop Management Extension Padi. Skripsi.
Bogor Agricultural University: Bogor.
Rawa Lawa Rice: Guidelines for Agricultural Extension.
Agency for Agricultural Research and Development.
Agriculture department. Jakarta.
Sriyani, N, Soesiladi, E. Widodo, M. Kamal, A. Karyanto,
P. Setiawan, D.J. Sembodo, E. Pramono, M.S. Hadi.
1998. Increased national rice production through
paddy field cultivation system and less productive land
use. Proceedings of the National Seminar. Lampung 9-
10 December. Indonesian Weed Sciences Association
(HIGI). Komda Lampung.
Supriadi, H., and A. H. Malian. I. 1995. Agronomic
Feasibility of Rice Cultivation Technology Spread
directly in Irrigated Rice Field. In Sham, et al. (Editor).
Food Crops Research. Book 3. Proceedings of the Plant
Research Symposium Food III. Jakarta / Bogor 23 - 25
August I993. Research and Development Center Food
Plant, Bogor.
Suryana, A., Suyamto, S. Abdulrachman, I.P. Wardana, H.
Sembiring, and I.N. Widiarta. 2007. Field Technical
Guidelines Integrated Crop Management (ICM)
Irrigated Wetland Paddy: Guidance for Agricultural
Extension. Agency for Agricultural Research and
Development. Department Agriculture. Jakarta.
Suryana, A., Suyamto, H. Pane, Suwarno, B. Kustianto,
A.K. Makarim, Sutrisno and H. Sembiring. 2007. Field
Technical Guidelines for Integrated Crop Management
(PTT)
Suwanda F N. 2008. Communication Effectiveness Analysis
Model Prima Tani As Dissemination of Agricultural
Technology in Citarik Village, Karawang Regency of
West Java. Bogor Agricultural Institute. Bogor.
Tabela Systems for Sustainabilty Agriculture in Northern of Sumatera
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