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Rajkhowa, S.
- Problems of forestry in Assam
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Indian Forester, Vol 112, No 7 (1986), Pagination: 616-620Abstract
The problems relating to forestry in India have been discussed in the paper. After Independence, government 'khas' forests land was given for non-forestry uses like agriculture, Reserve forests, too, have been falling victim to land grab by squatters. Unfortunately, vested political interests have contributed to this. The situation has reached a stage when all sections of society have to be enlightened about the importance of various categories of forests.
- The Upper Assam Dipterocarpus-mesua Forests and their Regeneration
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Indian Forester, Vol 87, No 7 (1961), Pagination: 406-425Abstract
No abstract- Forest Types of Assam, with Special Reference to the Evergreen and Semi-evergreen forests
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Indian Forester, Vol 87, No 9 (1961), Pagination: 520-541Abstract
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.
- The Effects of Periodicity, Height and Depth of Freshening on the Resin Yield from Young Pinus roxburghii Sargent and Seasonal Response
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Indian Forester, Vol 88, No 2 (1962), Pagination: 83-88Abstract
A substantial increase in the annual yield of resin from young Pinus roxburghii can be obtained by using short tapping cycles. The response to shorter cycles is very little in the first month of tapping, but increases rapidly as the summer advances. Again, by August, the response drops off suddenly. This suggests a varying frequency of tapping at different months of the year. A tentative scheme of tapping suggested has the advantage that tapping is done only during four months of the year, giving the tree rest for 8 months in each year, and yet producing nearly double the yield obtained under the conventional method. With short tapping cycles, it is also possible to reorganise the field work so that the tapping cost does not increase.- Use of Chemical Stimulants in Tapping Resin from Pinus roxburghii
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Indian Forester, Vol 88, No 3 (1962), Pagination: 188-201Abstract
Tapping resin from Pinus roxburghii using a 25cm. (10") wide bark freshened blaze, sprayed with sulphuric acid, yielded about the same as could be expected from two standard Indian blazes put on the same tree. Using standard Indian 10 cm. (4") wide blazes, it was found that spraying sulphuric acid did not result in any increased yield. Spraying a 25% solution of hydrochloric acid on wood chipped blaze along with a 7 day freshening period increased the resin flow by about 18%, but the application of the acid did not permit of using a bark chipped blaze, or of a longer cycle, to yield resin at least equal to the standard tapping.- The Relative Importance of the Various Tending Operations on the Early Growth and Survival of Sal Seedlings in Eastern Terai Sal
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Indian Forester, Vol 90, No 3 (1964), Pagination: 137-146Abstract
An experiment was laid out in Eastern Terai Sal in Assam to study the effects of spacing of mother trees, rain weeding and winter treatment on the growth and survival of sal seedlings in the first three years of life. More than one rain weeding did not make any significant difference in survival of sal seedlings at any time. In the first year, clean weeding in winter and removal of weeds from the plots gave significantly better survival, but on subsequent years, the effects of winter treatments was not significant when late fires were prevented. The spacing of mother trees had an effect on survival in the first year, and in establishment of seedlings. For survival in the first year, the best spacing of mother trees was 120 ft. As for getting the seedlings established, the effect of the number of rain weeding was highly significant. In this case, all two factor and three factor interactions were significant or nearly so. The best spacing of mother trees for getting the seedlings estahlished was 90 ft.- Studies in Mutual Competition Amongst Forest Seedlings-I
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Indian Forester, Vol 90, No 4 (1964), Pagination: 219-224- Germination of Cephaelis ipecacuanha
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Indian Forester, Vol 90, No 5 (1964), Pagination: 312-314Abstract
Under climatic conditions prevailing in Assam, seeds of Cephaeli, ipecacuanha ripen by October. By that time, the temperature becomes too cold for germination of the seeds. Experimental evidence shows that the optimum period of sowing the seeds in Rurserie is between the first week of February to the middle of March. If sowings are delayed till the break of the rains, very poor germination results. Using viable seeds, as determined by water test, and soaking them in cold water for 12 to 24 hours before sowing, gives 40 to 55 per cent germination by mid-July, if sown within this period, and this accounts for about 80 per cent of the germination expected till the end of the year.- Studies in Mutual Competition amongst Forest Seedlings. II
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Indian Forester, Vol 91, No 11 (1965), Pagination: 767-777Abstract
no abstract- A Short Note on Planting Trials with Albi ia procera
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Indian Forester, Vol 91, No 12 (1965), Pagination: 845-847Abstract
no abstract- The Effect of Rain Weeding on the Growth of Sal Seedlings
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Indian Forester, Vol 92, No 2 (1966), Pagination: 75-78Abstract
no abstract- The Effect of Inorganic Fertilisers on the Height Growth of Pinus taeda and Pinus caribaea Seedlings
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Indian Forester, Vol 92, No 4 (1966), Pagination: 260-263Abstract
no abstract- The Effect of Inorganic Fertilisers on the Growth of Deodar Seedlings
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Indian Forester, Vol 92, No 5 (1966), Pagination: 296-298Abstract
An experiment carried out in Shillong (1,370 m) showed that though there was some indication of increase in height of Deodar seedlings on adding Superphosphate to the soil, there was a definite decrease in height growth on adding, Ammonium sulphate. In view of these results, the role of soil nitrogen in early growth and natural regeneration of Deodar stands needs further study.- Cultivation of Rauwolfia canescens
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Indian Forester, Vol 93, No 3 (1967), Pagination: 149-161Abstract
no abstract- Woodlands of Assam
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Indian Forester, Vol 94, No 2 (1968), Pagination: 137-146Abstract
no abstract- The Cultivation of Ipecac Roots in Assam-I
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Indian Forester, Vol 95, No 4 (1969), Pagination: 246-252Abstract
no abstract- The Cultivation of Ipecac Roots in Assam-II
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Indian Forester, Vol 95, No 8 (1969), Pagination: 568-575Abstract
no abstract- The Shape of a Teak Tree
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Indian Forester, Vol 96, No 10 (1970), Pagination: 719-731Abstract
no abstract- Thinning Grades According to Pudden's Constant (An Interim Report)
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