V. K. Mokashi

Abstract

Complete enumerations were carried out in 1942 in the Nersol Slopes Forests. Different species were enumerated by strips as sound and unsound. Total number of sound trees of teak on a strip was treated as a variate. The eight compartments for which the data were available, were treated as strata. The analysis of the data was carried out and was used to find out the sample size for stratified random sampling with (1) optimum allocation and (2) proportional sampling in strata. The former was found to be efficient than the latter. The sampling intensity required to estimate the total number of sound trees of teak with 8% standard error amounted to 6 to 7 per cent of the total number of strips. If sampling work is extended to all the seventeen compartments, the sampling intensity could be considerably reduced for the same precision.

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V. K. Mokashi

Abstract

Investigations on the proper sampling technique and the sampling intensity for estimation of growing stock with a reasonable accuracy are in progress in Bombay State. Certain results are arising out of these investigations on the data of complete enumeration in one compartment of Dangs division, are discussed here. It was found that with strip sampling over larger areas, comprising a large number of compartments, the number of trees of teak per acre might be estimated with 4 per cent standard error by adopting eight per cent sampling intensity. While by two-stage random sampling, where certain number of strips are randomly selected in the first stage after dividing the forest area into strata and a certain number of plots are randomly selected from the selected strips at the second stage, the same precision could be obtained by five per cent sampling. In other words it was seen that random line-plot survey gave more precise estimates than strip survey for the same intensity of sampling. Unfortunately there is no data available to judge the relative efficiencies of the two methods from the point of view of cost.

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N. S. Kaikini , V. K. Mokashi

Abstract

The fuel problem in the Bombay State is covered with special emphasis on the wasteful use of Cowdung as fuel. Statistical data about the quantity of Cowdung used as fuel and how it could be made to provide manure for the fields, especially on bunds is recommended and its value assessed. Village woodlands and farm wood lots are also suggested to supplement the fuel resources.

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V. K. Mokashi

Abstract

The problem of estimation of error variance of a systematic sample has been reviewed. Two alternative designs have been suggested. One envisages modification of the stratified random sampling design such that the sample becomes partly systematic and partly random. The other design is a modification of a latin square restricted sampling design which again is partly systematic and partly restricted random. The designs need to be tested before application on different areas. Further studies are desirable in this direction.

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V. K. Mokashi , D. P. Acharya

Abstract

Distributions arising out of sampling a forest area by treating small sized plots as sampling units are studied. It is observed that the number of trees in bigger girth classes follow a negative binomial distributlon for small plots as sampling units. The effects of Such distribution are indicated. However the case discussed here is limited to a particular forest and plot size. Further studies are needed to confirm these findings. Various distributions call for further probe under different forest conditions. Such studies are in progress.

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V. K. Mokashi , D. P. Acharya

Abstract

The paper deals with the methods of estimation of girth or diameter increment from successive inventories. The basic considerations in employing the ratio of double rising by double effective, in the classical French method of calculating diameter increment by diameter classes from successive inventories, have been examined. Alternathe methods in place of the existing ones or modifications there of have been suggested in the paper. It is felt that the paper would promote interest in the conduct of further research on the subject.

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V. K. Mokashi , Z. R. Yadav

Abstract

The study of plot size to be employed in forest enumeration surveys has not received the attention it deserves. Investigations have been carried out to determine the relationship between plot size and variance empirically. The variance law empirically established by Jessen has been examined and is found to follow the same. Broad indications have been given in regard to plot size for various situations of costs of enumerations and movement from plot to plot.

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