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Seth, S. K.
- Taper Curves for Acacia Catechu (Khair)
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Indian Forester, Vol 76, No 5 (1950), Pagination: 198-198Abstract
No abstract
- A Scheme for Partial Enumerations in the Hills
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Indian Forester, Vol 77, No 1 (1951), Pagination: 24-25Abstract
Orthodox sampling methods used in Forestry depend upon accurate survey to locate and demarcate the sampling units. This item is chiefly responsible for the disproportionately large amount of time and money required for partial sampling as compared to total enumerations over whole compartments. A method is described which dispenses with survey almost altogether as it makes use of the detail given in large scale survey maps both to locate the sampling units on the ground and to determine their areas accurately. Its chief utility lies for sampling in the hills because it is possible to mark out comparatively small (30-75 acres) sampling units on survey maps. Stratifkd sampling with enumeration of two sampling units per block is advocated and the expression for calculating the fiduciary limit of the mean growing stock per acre is given. The question of weightage to allow for differences in areas of sampling units is discussed.- Sampling and Assessment of Natural Regeneration
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Indian Forester, Vol 79, No 5 (1953), Pagination: 274-287Abstract
No abstract- Forests and Forestry in Uttar Pradesh
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Indian Forester, Vol 80, No 12 (1954), Pagination: 851-860Abstract
The past history of U.P. forests and the present organization of the Forest Department are briefly touched upon. An account of the principal forest types with special reference to sal forests, follows. Next, forest resources, classification of forest areas, silvicultural systems and the status of natural and artificial regeneration, are reviewed. Short sections are devoted to silvicultural research and Working Plans. Extension forestry and forestry in soil conservation are briefly described with details of localities, areas, species, etc. The account is closed with short note on wildlife, five-year plans, nurseries and seeds, fruit trees, grazing, communications and financial results.- A Short Note on Sporoboletem Grasslands of Uttar Pradesh
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Indian Forester, Vol 81, No 3 (1955), Pagination: 185-190Abstract
No abstract- Applied Ecology in Forestry
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Indian Forester, Vol 81, No 8 (1955), Pagination: 456-464Abstract
In the field of forestry, ecology has its principal application in the techniques of Silviculture. The first desideratum is a practical classification of forest areas into primary forest types. It is in this perspective that the following four aspects should be considered, which have been chosen to illustrate the main patterns of ecological approach involved in practical silviculture: ( i ) Silvicultural systems with natural regeneration. ( ii ) Silvicultural systems with artificial regeneration. ( iii) Subsidiary silvicultural operations. ( iv) Introduction of exotics. Under the first category are included the standard techniques of natural regeneration, based on the syn-ecology of the dominant communities. These are examples of applied syn-ecology within the framework of a system of management. The second section lays .tress on the application of aut-ecological knowledge in the formation of plantations, or the creation and establishment of "abnormal" tree communities. The third section embodies somewhat localized cultural practices which illustrate the synthesis of syn- and aut-ecological principles as applied to subsidiary and subdominant communities (including regeneration of the dominant tree species) under the main canopies of a tree forest. The last category deal. With an aspect of forestry in which the correct valuation of complex syn- and aut-ecological factors should precede experimentation and where eventual success may depend upon the nicety with which such factors are assessed. A few examples are cited.- Calculation of Diameter Increment from Successive Inventories
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Indian Forester, Vol 82, No 11 (1956), Pagination: 547-552Abstract
No abstract- Basic Information on Soil Samples
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Indian Forester, Vol 83, No 8 (1957), Pagination: 518-527Abstract
No abstract- A Simple Field-cum-laboratory Method of Determining Soil Permeability
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Indian Forester, Vol 84, No 7 (1958), Pagination: 397-401Abstract
An apparatus designed for a field-cum-laboratory method, wherein undisturbed soil columns taken in the field can be used for determining soil permeability in the laboratory, has been described in detail. Permeability data for soils of the Demonstration Area at the Forest Research Institute, Dehra Dun have been reported. The method has proved to be simple, accurate and easily workable, and is recommended for adoption with advantage in studies of hydraulic conductivity, particularly of forest soils.- Regeneration of Teak Forests
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Indian Forester, Vol 84, No 8 (1958), Pagination: 456-466Abstract
Forests of the teak zone of India are described. Champion's types of Teak Forest are discussed and proposals are made for a revised classification of types, to meet the requirements of intensive management practices at present followed. Factors controlling the occurrence and development of regeneration are detailed and proposals are made for future research to solve the problems of natural and artificial regeneration in the teak zone of India.- Poplar Cultivation
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Indian Forester, Vol 86, No 1 (1960), Pagination: 21-27Abstract
No abstract- Soil Working Techniques in the Dry Zone in Relation to Rainfall and Soil Types
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Indian Forester, Vol 86, No 5 (1960), Pagination: 241-273Abstract
No abstract- An Analysis of Soil Moisture Regime in Sal (Shorea robusta) Forests of Dehra Dun, with Reference to Natural Regeneration
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Indian Forester, Vol 86, No 6 (1960), Pagination: 323-335Abstract
Dehra Dun Valley sal forests, conforming to Champion's B-3 High Level Alluvium. Type, characteristically reproduce freely but sometimes the reproduction is deficient, particularly in areas which are rigidly fire-protected. The long history of forest management and protection has led to conditions under which large tracts of these forests are not reproducing adequately. The existing conditions have,' therefore, been investigated with regard to seed-source, seed bed conditions, climate, light, moisture, nutrient requirements and the ameliorative effects of fire. In particular an analysis of the soil moisture regime has been made and correlated with the various developmental stagts of sal seedlings. Suggestions have also been made with regard to adoption of suitable forestry practices to achieve regeneration de novo and to promote the timely establishment of sal seedlings. It is concluded that if the manipulation of sal forests is carried out in a manner conforming to the climato-ecological requirements of sal seedlings, a regeneration period of 15 to 30 years should suffice to restock the area with established sal regeneration.- Characteristic Features of Natural Regeneration under Various Tending Schedules in Hollong-nahor (Dipterocarpus-mesua) Forests of Assam
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Indian Forester, Vol 86, No 6 (1960), Pagination: 355-373Abstract
No abstract- Soils of the Tropical Moist Evergreen Forests of India
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Indian Forester, Vol 86, No 7 (1960), Pagination: 401-413Abstract
No abstract- Indicator Species for Sal (Shorea robusta) Natural Regeneration
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Indian Forester, Vol 86, No 9 (1960), Pagination: 520-530Abstract
No abstract- Interrelations between Mineral Constituents of Foliage, Soil Properties, Site Quality and Regeneration Status in Some Shorea Robusta Forests
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Indian Forester, Vol 86, No 10 (1960), Pagination: 590-601Abstract
No abstract- Efficiency of Weedicides in Controlling Weed Species in Moist Deciduous (High Level Alluvial) Sal (Shorea robusta) Forests
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Indian Forester, Vol 87, No 3 (1961), Pagination: 150-167Abstract
No abstract- Auto-regulators for Moisture and Nutrient Uptake Experiments
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Indian Forester, Vol 87, No 9 (1961), Pagination: 512-519Abstract
No abstract- The Effect of Periodicity, and Length and Depth of Freshening on the Yield of Resin from Pinus roxburghii
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(1) The periodicity of freshening exercises the maximum influence on the yield of resin per season. For the same depth of blaze and the same rise of the channel per season, increasing the number of equispaced freshenings per year increases resin yield upto 250% of that obtained under the standard 6 day cycle. A shorter tapping cycle tends to deepen the channels, but this tendency can be checked by freshening the upper 3" of the blaze alone instead of the upper 6" as practised now, at only a slight loss of yield, amounting to about 6%. (2) For the same freshening cycle, increasing the length of fresh wood removed at each freshening increased the yield. (3) The depth of freshening has no appreciable effect on resin yield. (4) Early start of tapping increases the yield of resin, not only by augmenting the annual yield by the extra amount collected during the early days, but also by increasing the yield in the subsequent month or so. (5) Under the prevailing prices, it is quite economical to tap as often as every alternate day without increasing the total height of the channel per year. How far such short cycles effect the health of the trees or jeopardise future yield has, however, to be investigated in long term experiments.
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Indian Forester, Vol 87, No 12 (1961), Pagination: 724-730Abstract
A set of three experimental plots maintained for 2 years at different localities at different altitudes, to study the effect of periodicity of freshening, and depth and height of the blaze, using standard 4" wide blazes, has shown that:(1) The periodicity of freshening exercises the maximum influence on the yield of resin per season. For the same depth of blaze and the same rise of the channel per season, increasing the number of equispaced freshenings per year increases resin yield upto 250% of that obtained under the standard 6 day cycle. A shorter tapping cycle tends to deepen the channels, but this tendency can be checked by freshening the upper 3" of the blaze alone instead of the upper 6" as practised now, at only a slight loss of yield, amounting to about 6%. (2) For the same freshening cycle, increasing the length of fresh wood removed at each freshening increased the yield. (3) The depth of freshening has no appreciable effect on resin yield. (4) Early start of tapping increases the yield of resin, not only by augmenting the annual yield by the extra amount collected during the early days, but also by increasing the yield in the subsequent month or so. (5) Under the prevailing prices, it is quite economical to tap as often as every alternate day without increasing the total height of the channel per year. How far such short cycles effect the health of the trees or jeopardise future yield has, however, to be investigated in long term experiments.
- A Review of Evidence Concerning Changes of Climate in India during the Proto-historical and Historical Periods
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Indian Forester, Vol 88, No 1 (1962), Pagination: 2-16Abstract
Archaeological, historical, literary, sculptural and scientific evidence has been sifted in order to determine if any provable change of climate has taken place in the Indo - Pakistan subcontinent during the proto-historical and historical periods, whether the flora has changed significantly, and finally whether there has been a natural change in climatic conditions leading to vegetational adjustments or, contrariwise, the interference with natural vegetation has caused a deterioration in the prevailing climate. The archaeological evidence mainly relates to the Indus civilization period whereas literary and historical sources have been employed for the later historical period. Available data regarding plant and animal remains have been considered. The characteristics of the desert and the changes in its drainage pattern have been discussed and the theories postulating a recession of the monsoon belt have been briefly considered. It is concluded that while there is likelihood of climate having changed somewhat, especially in the Lower Indus Valley and Rajasthan, the destruction of vegetation has materially contributed to the deterioration in the climatic conditions. In the rest of the country, the extermination of native vegetation over large tracts has been the main factor responsible for worsening the environmental conditions and causing a consequent change in the succeeding flora.- Sal Mortality in Bihar
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Indian Forester, Vol 86, No 11 (1960), Pagination: 645-679Abstract
Wide-spread sal (Shorea robusta) mortality occurred in the Forest Divisions of Daltongunj, Latehar and Ko1han in Bihar in 1951 onwards. Drought was suspected to be the main cause of this calamity and accordingly a study of climate was undertaken and monthly fluctuations of soil moisture in the entire profiles of 6 ft. depth at three locations were computed for the period from 1941 to 1955. These values of soil moisture were grouped into five categories and taking into consideration the periods during which each of these moisture conditions prevailed in the ischolar_main zones 'drought values' and 'drought severity values' were determined as percentage departures from the normal conditions of duration and moisture status. These values were integrated to arrive at 'drought mortality values' and the effect of successive drought years was assessed as 'cumulative drought mortality values' (C.D.M.V.). The observed pattern of mortality was correlated with these values. The close correlation between the cumulative drought mortality values and the actual pattern of mortality at Daltongunj proves that drought is the main cause of mortality. Management of such drought-affected sal forests is also suggested.- Teak Soils
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Indian Forester, Vol 85, No 1 (1959), Pagination: 2-16Abstract
The data on geology and soil of teak forests representing natural as well as artificial conditions with special reference to India, Pakistan, Burma and Indonesia have been described in detail. The optimum conditions of soil, elevation, topography, moisture, etc., required for the normal teak growth have been indicated. The feasibility of relationship between the different geological formations and the composition and distribution of teak forests has been elucidated. The requirement of teak for soil pH and lime has been critically examined. The nature and extent of soil deterioration consequent on clear-felling a natural forest and planting the same with teak have been discussed.- Bio-climate and Plant Introduction in Dry Zone
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Indian Forester, Vol 85, No 7 (1959), Pagination: 376-384Abstract
The study of climate and climatic homologues is an essential prerequisite in any scheme of plant introduction. This is particularly so for afforestation practices in the dry zone. The broad principles relating to influence of climate on the distribution of plants are reviewed and Emberger's climatic index is worked out for the dry zone of India in order to delimit climatic sub-types. It is, however, felt that the sub-types so formed do not harmonise with the natural vegetation types of the area. The concept of "Effective Temperature Index" is therefore developed which sufficiently modifies Emberger's formula to bring it in consonance with the natural vegetation types. Instead of plotting Q, the bioc1imatic value (200P/M2-m2) against m(av. min. temp. of the coldest month), it is plotted against m( M-m) where M is the av. max. temp. of the hottest month.- Preliminary Trials with Gibberellic Acid
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Indian Forester, Vol 85, No 9 (1959), Pagination: 528-532Abstract
Results of two trials conducted at new forest during 1958 with the object of studying the effect of Gibberellic acid on tree seedlings are described. The species experimented upon have shown considerable variation in their response to the treatment. In majority of cases height growth was accelerated. Generally speaking the stronger solutions gave greater height growth. Very rapid growth, however, produced undesirable traits associated with etiolation and was also accompanied by reduced ischolar_main development. Weaker strengths of the chemical gave less spectacular increase in height growth but the plants were apparently quite healthy and possessed well developed ischolar_main system.- Utilization of Small-dimension Stock in the Building Industry Through Modern Timber Engineering
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Indian Forester, Vol 85, No 10 (1959), Pagination: 600-602Abstract
The scope for utilizing small-dimension stock instead of large timber pieces, to construct (with the aid of modern timber engineering techniques) timber structures used in the building industry is indicated. The effects of such chang-eover, not only on timber conversion and utilization, but also on the objects and methods of forest management are explained. It is suggested that fast-grown timber species could be raised and worked with advantage on comparatively short rotations, in conjunction with the utilization of small-dimension stock for constructional work.- Soil Suitability Index for Sal (Shorea Robusta) Natural Regeneration
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Indian Forester, Vol 85, No 11 (1959), Pagination: 631-640Abstract
Soil culture experiments were conducted to determine desirable soil properties for securing good sal regeneration and the relation of comparative growth data to the status, good or deficient, of sal regeneration in the localities from which the samples are derived. The study revealed that the North Kheri good regeneration area soil is significantly superior to all the others in all characters except leaf area increment and even in this regard it shows the maximum development. Within the range of this study then, this soil may be taken as the ideal from the point of view of sal, and other soils may be rated accordingly as they approximate to or depart from this soil in various properties. All the soils originating from deficient regeneration areas are inferior to those originating from good regeneration areas, except for Bahraich soil from good regeneration area. A critical examination of all the soil determinations, i.e., mechanical, physical and physico-chemical, reveals that of the 14 characters, only soil pH, soil moisture in situ, water holding capacity, moisture equivalent and organic matter show indications of a definite relation to height increment, which has been selected as the index of suitability for natural regeneration. The range of dispersion of pH values is small and much reliance cannot be placed on moisture in situ which is largely dependent upon climatic conditions and therefore these two factors cannot be used as a basis for classifying soils with reference to development of sal seedlings. A statistical analysis was therefore carried out to test the multiple correlation between the remaining three factors (also including squared terms to provide for nonlinear effects, if any) and it was found that height increment could be expressed as a function of X, X2, y, y2 (where X is organic matter % and y is moisture equivalent %) each of which contributed significantly. Lower levels of organic matter and higher values of moisture equivalent indicate superior conditions for sal growth. Since organic matter too varies within comparatively low limits it was also investigated whether an equation using water holding capacity and moisture equivalent could be used. It was found that a linear relationship with moisture equivalent could be established. These relations emphasize the fundamental and domineering role played by water and the moisture retaining and releasing properties of the soils vis a vis sal natural regeneration.- Bamboo Experiments
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Indian Forester, Vol 85, No 12 (1959), Pagination: 699-709Abstract
No abstract- Management of Dry Zone Soils
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Indian Forester, Vol 85, No 2 (1959), Pagination: 75-109Abstract
No abstract- Some Observations on Nutrition Cycle and Return of Nutrients in Plantations at New forest
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Indian Forester, Vol 89, No 2 (1963), Pagination: 90-102Abstract
It is generally believed that pure plantations are usually exacting on soil nutrients and continued rotations of the same species, on the same site, may deteriorate the site conditions considerably. The annual leaf fall, which in most deciduous species commences by about December, continues for a few months and may even linger on till the rains, brings back some proportion of these nutrients to the soil, but the exact quantities so involved are not known for Indian species. The matter needs all the more attention in view of large scale afforestation of degraded areas in the country with fast growing short rotation species. A preliminary investigation in this regard was therefore considered necessary and data were collected from teak (Tectona grandis), sal (Shorea robusta), chir (Pinus roxburghii), Araucaria cunninghamii and bamboo (Dendrocalamus strictus) plantations at the F.R.I., during the period November, 1960 to June, 1961.- Effect of Moisture Gradient on the Growth and Nutrient Uptake of Sal (Shorea robusta) Seedlings
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Indian Forester, Vol 97, No 10 (1971), Pagination: 615-625Abstract
Insufficient availability of moisture during the critical period of growth of sal seedlings is considered to be by far the most important factor inhibiting natural regeneration especially in the dry types of sal. However, experimental data on the actual moisture requirements of this species is lacking. The present article describes the results of an investigation wherein optimum moisture range and its affect on nutrient uptake for the growth of sal seedlings were studied with the help of an especially designed apparatus. The results indicate that in loamy soils, sal seedlings on an average require moisture to the extent of 85% of water holding capacity and 12% more than the moisture equivalent for optimum growth and there is an appreciable reduction in height increment below and above this range. Plants growing within the optimum range also absorbed greater amounts of nutrients especially Calcium, Magnesium and Phosphorus. The analysis of the residual soils indicates that the transfer of nutrients in the soil matrix is a slow process and a local deficiency may develop in the ischolar_maining zone which is not compensated by the diffusion of nutrients from neighbouring soil regions.- Effect of Moisture Gradient on the Growth and Nutrient Uptake of Sal (Shorea robusta) Seedlings
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Indian Forester, Vol 97, No 11 (1971), Pagination: 615-625Abstract
Insufficient availability of moisture during the critical period growth of sal seedlings is considered to be by far the most important factor inhibiting natural regeneration especially in the dry types of sal. However, experimental data on the actual moisture requirements of this species is lacking. The present article describes the results of an investigation where in optimum moisture range and its affect on nutrient uptake for the growth of sal seedlings were studied with the help of an especially designed apparatus. The result indicate that in loamy soils, sal seedings on an average require moisture to the extent of 85% of water holding capacity and 12% more titan the moisture equivalent fort optimum growth and there is an appreciable reduction in height increment below and above this range. Plants growing within the optimum range also absorbed greater amounts of nutrients especially calcium, magnesium and phosphorus. The analysis of the residual soils indicates that the transfer of nutrients in the soil matrix is a slow process and a local deficiency may develop in the ischolar_maining sone which is not compensated by the diffusion of nutrients from neighbouring soil regions.- Population Dynamics of Forest Stands-a Stochastic Approach
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Indian Forester, Vol 98, No 2 (1972), Pagination: 71-82Abstract
no abstract- Effect of Profile Morphology on Root Development of Sal (Shorea robusta) Seedlings
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Indian Forester, Vol 98, No 3 (1972), Pagination: 156-167Abstract
The article describes the effect of stratified profiles consisting of alternate layers of soil and sand of different thickness on ischolar_main development of sal seedlings. The seedlings were grown in two separate profiles of 18 inches thickness, one consisting of 6 inch thick sand layer in between two 6 inch thick soil layers and the other of 6 alternate layers of soil and sand each 3 inch thick with a soil layer at the top. The results indicate that 6 inch thick sand layer underlying soil layer of equal depth is unfavourable for ischolar_main development. It appears that a 3 inch thick top soil layer is incapable of supplying adequate amount of moisture and nutrients to meet the demand of seedlings and that 3 inch thick sand layer is not an impediment for deep ischolar_main penetration. The inference may be drawn that the soli profiles having sand layers 6 inch or more in thickness, especially if they underlie a thin top soil layer, may prove detrimental to the growth of sal seedlings particularly during the establishment stage and may be the cause of die-back or stagnation in such localities. On the contrary lengthy ischolar_mains stimulated by 3 inch thick alternate layers of soil and sand may be better able to tolerate drought conditions than those produced in the profile having a 6 inch thick intermediate sand layer where the ischolar_main development was arrested at the transition boundary between soil and sand.- Population Dynamics of Forest Stands - an Algebraic formulation I
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Indian Forester, Vol 98, No 11 (1972), Pagination: 633-646Abstract
no abstract- Population Dynamics of Forest Stands-an Algebraic formulation-II
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Indian Forester, Vol 98, No 12 (1972), Pagination: 679-697Abstract
no abstract- Population Dynamics of Forest Stands-an Algebraic formulation III
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Indian Forester, Vol 99, No 1 (1973), Pagination: 1-11Abstract
no abstract- Population Dynamics of Forest Stands-an Algebraic formulation IV
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Indian Forester, Vol 99, No 2 (1973), Pagination: 55-67Abstract
no abstract- Population Dynamics of Forest Stands-an Algebraic formulation-V
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Indian Forester, Vol 99, No 5 (1973), Pagination: 248-262Abstract
no abstract- Population Dynamics of Forest Stands-an Algebraic Formulation-VI
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Indian Forester, Vol 99, No 6 (1973), Pagination: 324-336Abstract
no abstract- Errata to Parts I to VI - Population Dynamics of Forest Stands-an Algebraic formulation
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Indian Forester, Vol 99, No 6 (1973), Pagination: 336-336Abstract
no abstract- Surface Relief, Alluvial Morphology and Vegetation in the North Kheri Division, Uttar Pradesh
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Indian Forester, Vol 100, No 6 (1974), Pagination: 361-366Abstract
The surface relief, alluvial morphology and vegetation of the intercone or platean lying between the Suheli and Mohan rivers in the northern half of the North Kheri Forest Division, U.P. has been studied and discussed. It has been concluded that there is good correlation between the surface relief and vegetation whereas the influence of alluvial morphology is not felt markedly, due in large part to the presence of a deep mantle of clay or loam on the surface.- A Comparative Study of some Distribution Functions as Applied to Diameter at Breast Height in Even-aged Stands
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