By N. M. Idaikkadar
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Extra resources for Agricultural Statistics. A Handbook for Developing Countries
5 Estimation of mean yield It is assumed here that the domain is an administrative district and stratified by sub-administrative divisions. Within such a division (stratum) a number of primary or first stage sampling units (villages) would be 1 Biological yield is the theoretical yield - without allowing for harvesting and threshing losses. 27 Agricultural Production - Crop Yields selected approximately proportional to the area under the crop. From a selected primary unit a fixed number of second-stage units (fields under the crop) would be selected and finally from each selected field, one crop cutting plot of prescribed size and shape would be selected as described earlier in the chapter.
The data collected would pass through 1 the various levels of administration (3 or 4) to get to the national level where they are processed and made available to the Government and the public. If we examine the data as collected we will generally find that the quality depends on many factors such as the level of the reporting unit, the method of collection, the availability of cadastral maps and whether the estimates are obtained by subjective or objective methods. The most important aspect in the system is the level of the reporting unit.
The next step is to estimate the probability of survival till harvest for each maturity class. These probabilities are estimated from observations made in previous surveys by noting the survival of tagged fruit on sample plots. If N¿ is the number of fruits in maturity class i and p¿ is the probability of survival in that class then the forecast of the total number of fruits for harvesting is the sum of p¿N| for all the maturity classes. To complete the forecast the weight of fruit per unit at harvest is needed.
Agricultural Statistics. A Handbook for Developing Countries by N. M. Idaikkadar