By N. M. Idaikkadar
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Additional info for Agricultural Statistics. A Handbook for Developing Countries
The cropped area in the entire cluster/field is measured as well as the area under drains, channels, bunds within the cropped area. These should be calculated and correction factors worked out for each domain of study. As an example, let us take the sample survey for cotton in Egypt 1956. 1%. Such sampling methods for improving area estimates are done along with crop cut for economy of time and money. These methods are 1 In India, experience has shown that official estimates of crop acreages obtained through complete enumeration (reporting system) in cadastral areas by the headmen, are reliable and can be used for all policy decisions, even for smaller administrative units like districts or sub-districts.
The first method is not satisfactory as the farmers are not randomly selected and even if randomly selected, the estimate would suffer from the inability of the farmers to give accurate figures. The second method would be accurate only if the cropped area is in one block (which is not often the case), and some map or plan is available indicating 1 Sometimes referred in the text as "levels of reporting*'. Agricultural Production (Crops) - Area 35 the rough acreage. The countries using big reporting units are fast realizing their unsuitability and are gradually replacing them by smaller units.
In our work we resort to area measurements in the following cases: (i) (ii) (iii) Cropped areas; Non-cadastral lands; Holdings. In cropped areas, measurements are done on a sampling basis (a) to improve on the quality of data collected by the reporting system and (b) to estimate cropped areas objectively as an alternative to complete enumeration by the reporting system. In non-cadastral lands, measurements are done on a systematic basis to provide in due course cadastral maps of cultivable lands in such areas for the whole country as an alternative or forerunner of such maps by trained surveyors.
Agricultural Statistics. A Handbook for Developing Countries by N. M. Idaikkadar