Informatics Publishing Limited

V. K. Bahuguna , K. P. Unnikrishnan , U. C. Dhaundiyal

Abstract

Albizia falcataria (L.) Forberg is one of the most fast growing species. It makes few demands on the soil and hence is suitable for rapid afforestation of poor soil. On account of its wide adaptability, the species promises to be one of the excellent planting materials for social forestry and wasteland afforestation programmes, particularly in areas where the rainfall is good. The paper deals with the results of an experiment, carried out on its nursery technique and choice of better provenance under Dehra Dun conditions.

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A. K. Chaubey , K. P. Unnikrishnan , S. K. Sheel

Abstract

When the independent variates in a regression model exhibit perfect or high degree of dependence among themselves, the method of least squares fails to provide satisfactory estimates of regression coefficients. The variables are then said to be collinear and the phenomena is termed multicollinearity. In studies pertaining to socio-economic conditions this phenomena is most likely to occur. We are, therefore, not concerned whether or not multicollinearity exists in our data in such situations but upto what degree it exists and affects our estimates, and how the problem can be dealt with, since the presence of severe multicollinearity badly affects the least square estimators and makes them imprecise. Though there are many methods to overcome this problem, we have in our study emphasized the use of Principal Component Analysis as the most suitable method.

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T. C. Pokhriyal , B. C. Ramola , M. S. Bisht , H. O. Nautiyal , K. P. Unnikrishnan

Abstract

Nitrate contents in the leaf, litter and soil upto 60 cm depth were investigated in the natural sal (Shorea robusta) forest, Jhajra, DehraDun. Significantly more soil nitrate was observed in the upper depths (0-30 cm) as compared to 30-60 cm depth. The nitrate contents in the top and middle portion of canopy were significantly higher as compared to the nitrate content in the bottom portion. The nitrate content in the leaves have also responded to the seasonal variations. Though there was no significant correlations observed among the variables when data was pooled for the whole year, significant correlations were available within the seasons.

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V. K. Bahuguna , G. P. Maithani , U. C. Dhaundiyal , K. P. Unnikrishnan

Abstract

Acacia albida Del. is a multipurpose Sahelian Zone African tree. This tree is extensively used in Agro-foretry purpose. This species is belong introduced in Indian conditions. An investigation was taken up in tbe Nursery of Silviculture Branch of Forest Research Institute, Dehra Dun, to standardize its nursery tecbniques. For finding out the best combination of soil media and containers. The findings of this experiments are discussed in this paper.

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A. K. Chaubey , S. K. Sheel , K. P. Unnikrishnan

Abstract

The use of Partially Balanced Incomplete Block Designs (PBIBD) in timber engineering experiments has been described. The experiments are aimed at estimating the average safe load taken by timber 'joints and comparison of different types of connect dry used in making joints. It has been shown that when the experimental material is not' available in sufficient quantities or its cost is too prohibitive, PBIB designs are more appropriate than Randomised block designs.

Keywords

Incomplete Block Designs, Balancing of the Designs

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K. P. Unnikrishnan , A.K. Choubey

Abstract

Role of Statistics in the various facets of forestry research and management has been well recognised. This paper highlights some of the recent research work done on problems in forestry where statistical principles and methods have a larger role to play. They may be categorised as (i) studying of forest growth dynamics (ii) Nonparametric applications (iii) design of experiments and (iv) sampling. The applications of computer in forestry research is also highlighted in brief.

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K. P. Unnikrishnan , Ravendra Singh

Abstract

The present paper outlines the development of a volume table construction method based upon statistical principles. It lays special emphasis to the usual conditions which underlie the theory of regression and how these can be met in finding out best fit volume equations. Description of a computer program developed on these lines and finalised for 'System-332', Computer is an added feature. Stand table and volume tables constructed for sample data for the species Diperocarpus indicus have been included in the paper.

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