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Estimating Area and Production of Rice Under Different Crop-cut Methods in Bangladesh

M S Kabir
Director (Administration and Common Service)
BRRI, Gazipur, Bangladesh

D N R Paul
Former Chief Scientific Officer and Head
BRRI, Gazipur, Bangladesh

M I Hossain
Principle Scientific Officer and Head
Irrigation and Water Management Division, BRRI, Gazipur, Bangladesh

N M F Rahman
Senior Scientific Officer
Agricultural Statistics Division, BRRI, Gazipur, Bangladesh

Abstract/ Executive Summary:

Crop-cut is a widely used and well accepted procedure for estimating rice yield. This yield is then multiplied by the area planted under rice cultivation to determine rice production of the country. In Bangladesh, crop-cut is used to estimate transplanted rice yield. Department of Agricultural Extension (DAE) and Bangladesh Bureau of Statistics (BBS) as the public agencies provide estimate on area and production of rice but they use different methods of crop-cut. The estimates of these two agencies on area and production of rice are different posing a question to the users on the reliability of the estimates. An attempt has been made with the objective to formulate a protocol that provides reliable and unique estimates on rice area and production. It is suggested to make at least three cuts in each plot to minimize the chance of over or under estimation of the whole plot yield and the radius of the circle should be 178.5cm so that the cut area becomes 10 m² in order to easy conversion of the crop-cut yield to t ha^-1.

Keywords: Crop-cut, BBS, DAE, Rice, Area, Production

Location: Kapasia upazila of Gazipur

Start Date: 00-11-2006

End Date: 00-04-2007

Program Area: Crop-Soil-Water Management

Commodity: Harvester

Objectives:

To identify the Estimating Area and Production of Rice under Different Crop-cut Methods in Bangladesh

Methodology:

The technique of crop cut experiment (CCE) has various steps. There is certain equipment/material required for conducting the crop cutting experiments. These are: Measuring tape as per requirement (30 or 50 meter). Weighing balance as per requirement (Beam of spring balance). Set of weights (1, 2, 5, 10, 20, 50, 100, 200, 500; 1, 2 and 5 kg). String or rope (30 meter) Four pegs. The Hessian Cloth: is a coarsely woven fabric usually made from vegetable fibers and jute. Cloth bags for keeping the produce for crying. Two strong water proof bags (one for keeping crop cutting equipment’s and other for keeping schedules and papers etc.). There are various steps involved in the conduct of crop cutting experiments. These steps are: Selection of field (including size and shape of the CCE plot) where crop cutting experiment is to be carried out, Locating and marking of the experimental plot of a given size in the selected field, Harvesting of the CCE plot, Threshing of crop harvested from the CCE plot, Winnowing and weighing of the produce obtained from the CCE plot, Drying of produce, if it contains moisture, and Weight of the dry produce. The study was conducted at Kapasia upazila of Gazipur in Boro season 2007. The crop-cut was done in a farmer’s field in Boro. Farmers were selected randomly. At maturity, crop was cut and yield was estimated following standard procedure. Weight was taken and moisture was adjusted. The present crop-cut methods include the followings: For each variety, DAE takes three cuts each of size 5-×-2m, one from good crop, one from intermediate crop and the other from a bad crop in each block. The crop condition (good, intermediate and bad) is judged by visual inspection of crop stand, which is very much subjective and is likely to vary from person to person. Rice area in each season planted to different varieties is determined through farmer’s interview by the Sub-Assistant Agriculture Officers (former Block Supervisors). At the block level, the moisture content of crop-cut paddy is used as per directives of the upazila agriculture office. The directives are based on some sample crop-cuts and measurement of moisture content using moisture meter. DAE also uses BBS method of crop-cut where BBS personnel join DAE in crop-cut. The results suggest that method C i.e., a single circular cut where the plants falling inside the circumference of the circle are harvested, may be followed for crop-cut in estimating transplanted rice yield. It is suggested to make at least two cuts in each plot to minimize the chance of over or under estimation of the whole plot yield and the radius of the circle should be 178.5 cm so that the cut area becomes 10 m² in order to easy conversion of the crop-cut yield to t ha^-1.

Source of Information: Bangladesh Rice J. 20 (1) : 11-16, 2016

Article Link (Online Journal):

Funding Source:

1.

Budget:

Total Budget (Tk.) :

Achievement/Findings:

A detail block-wise account of area and the number of plots planted to rice crop in different seasons has to be made at every five- year interval. In each year, a detail block-wise account of the number of plots planted to rice crop in different seasons has to be made. Three crop-cuts have to be made in three rice fields for each variety under each land type. A single circular cut where the plants falling inside the circumference of the circle are to be harvested for crop-cut in estimating transplanted as well as direct seeded rice yield and the radius of the circle should be 178.5 cm so that the cut area becomes 10 m2 in order to easy conversion of the crop-cut yield to real yield at 14% moisture. At least two crop-cuts have to be made in each plot to minimize the chance of over or under estimation of the rice yield. DAE collects the information at the block in collaboration with BBS at upazila level. Upazila agriculture office will lead the coordination of the activities of DAE and BBS personnel.

Knowledge Management: Journal