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ජනලේඛන හා සංඛ්‍යාලේඛන දෙපාර්තමේන්තුව

தொகைமதிப்பு மற்றும் புள்ளிவிபர திணைக்களம்

Department of Census and Statistics


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CHAPTER V - AGRICULTURE , FORESTRY AND FISHERIES
AGRICULTURE
INDEX OF AGRICULTURAL PRODUCTION (VOLUME)

An Index of Agricultural Production is computed to provide a general measure of the yearly changes in the volume of Agricultural Production. The earlier index with 1934 - 38 as base was later revised using 1962 as base and the commodity coverage was also extended by including livestock products in the index. Finally it was revised in 2008 as the base of 2002. Moreover divisions of vegetables, fruits and some major commodities were also included in order to prepare more suitable index.

Indices for (a) tea, rubber, coconut and paddy, (b) pulses, (c) other food crops, (d) vegetables, (e) fruits (f) livestock and livestock products (g) small export crops are computed separately by comparing production volume in 2002. The overall index combining Agricultural Crops and Livestock products provides an indicator of the volume of Agricultural Production. The revised series with 2002 as base year is available from the year 2003 onwards.

 
PADDY STATISTICS

The present system of collecting paddy statistics has generally three aspects, namely (1) Statistics on area under paddy, (2) Average yield per unit area, (3) Statistics on paddy production. These statistics are collected in respect of the cultivation seasons of Maha and Yala for each cultivation year.

Statistics on area under paddy are collected each season on the basis of parcel wise complete enumeration, where in all the paddy parcels in the island are listed on the form P1, at village or tract level. For this purpose a “Parcel” is being defined as a plot of land set apart for the cultivation of paddy, cultivated singly or jointly by a person. It may be surrounded by cultivated paddy lands or highlands belonging to other people.

 
PADDY YIELDS

Statistics of paddy yield are compiled from Crop Estimation Surveys conducted on a sample basis. The sampling design adopt for the survey is a stratified three stage random sampling method with D.S. Divisions as strata and mode of irrigation namely; Major, Minor, Rainfed as sub-strata. From each stratum sample villages are select using simple random sampling method where the number of samples per stratum depends on the sownarea. About 3,000 villages/tracts/ kandams are select for each Maha Season and about 2000 villages/ tracts/ kandams are select for Yala Season. In each selected village/ tract/ kandam two parcels are selected at random and each selected parcel a “Liyadde” (plot) is selected on the same basis to conduct the experiment. In each liyadde thus selected the standard experimental plot of size 16 1/2ft. x 16 1/2 ft. (5.03meters x 5.03 meters) is laid out at random. Then the experimental plot is harvested, the grain threshed, winnowed and the yield is recorded separately. From these results average yield per net acre harvested is estimated at district level and island level.

 
CULTIVATION DETAILS

Information on cultivation details such as system of tenure, variety of seed, method of land preparation, method of sowing, method of weed control, use of fungicides and insecticides, application of fertilizer are collected through a sample survey conducted concurrently with the crop estimation survey on paddy. The sample used for estimation of cultivation details is about three times as large as the sample used in the crop survey and the sampling unit used here is the paddy parcel. Using the sample data and the estimated sown extents, the extents associated with the cultivation practices are estimated at district level.

 
PADDY PRODUCTION

The estimates of paddy production are obtained each season as a product of the net extent harvested and the average yield. The preparation of district wise correction factors to convert Gross area to Net paddy area was done using the results of an area survey conducted for this purpose. All Island correction factor of 85% used hitherto is being used only in respect of Colombo, Gampaha, Puttalam, Ratnapura and Badulla Districts where the area survey work is not completed as yet.

 
COST OF PRODUCTION OF TEA, RUBBER AND COCONUT

Data for the computation of the cost of production of Tea, Rubber and Coconut are obtained from estatesgrowing Tea, Rubber and Coconut using a mail questionnaire sent out from the Department once a year.

TEA

The cost of production relates to the cost per kilogram of manufactured tea. Questionnaires are sent to all the registered tea factories in the island. From the data thus collected the cost of production of a kilogram of made tea is estimated.

RUBBER

The cost of production per kilogram of manufactured rubber is computed at the all island level. Estates of 20 acres and more in extent are considered in thirteen rubber growing districts, where Colombo, Kalutara, Galle, Matara, Ratnapura and Kegalle are the major districts.

COCONUT

The major coconut growing districts are grouped in to 4 regions as follows: 

  1. North - Western Region;
  2. South - Western Region;
  3. North - Eastern Region;
  4. Central Region;

The estates in each region are stratified into 4 size groups i.e.20 - 50 acres, 51 - 100 acres, 101 - 250 acres and over 250 acres. The cost of production of coconut is computed for the whole island. 

 
HIGHLAND CROPS AND LIVESTOCK STATISTICS

Statistics of highland crops are collected on the ‘H’ form and livestock statistics on the ‘L’ form. The primary reporters in both these instances are the GramaNiladhari. in North and Eastern Provinces while in rest of the Island are Agriculture Research and Production Assistants (ARPA). The island consolidated statements are prepared using district reports seasonally for highland crops and annually for livestock populations.

 
SLAUGHTER STATISTICS

The data on the number of animals slaughtered in the licensed slaughter houses are collected annually. 

 
FOOD BALANCE SHEET

The Food Balance Sheet is a statement showing the amount of food available, values of calories, proteins and fats on a per capita basis per day during a calendar year. The Sri Lanka Food Balance Sheet confirms to the requirements of the F.A.O. of the United Nations.

Forty items of food classified according to eleven major groups are included in the Food Balance Sheet. The required data are obtained from Government Departments, Private Organizations and the Custom Returns. Where information could not be obtained from these sources, reasonable estimates of such quantities are used in the estimation procedures.

 
ECONOMIC CENSUS 2013/14
Data Collection of Agriculture Sector

The Department of Census and Statistics (DCS) conducted this census covering the sectors agriculture, industry trade and services. Agriculture and Environment Division was responsible for collection of agriculture sector data under the Economic Census 2013/14. Agriculture sector data collection of the Economics Census 2013/14 was planned to be conducted in two stages. At the first stage, the listing of all estates was carried out during June – July 2013 and the second stage: collection of detail data from the estates and small holdings was carried out during June – August 2014. A preliminary report based on the data collected at the listing of estates has already been released.

Extent
Production
Cost of Production
Livestock
Food Balance Sheet
Forestry
Fisheries

 

 

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P O Box 121, Battamulla, Sri Lanka - Telephone: +94 112147000 - Email:information@statistics.gov.lk