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Gupta, V. K.
- Age-age Correlation Models for Dalbergia sissoo Roxb. in Semi-arid Region of Central India
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Indian Forester, Vol 135, No 8 (2009), Pagination: 1050-1058Abstract
Nine years growth data of Dalbergia sissoo progeny trial established in semi-arid region of Central India was analysed. Significantly high age-age correlations were found for tree traits viz. height, dbh and D2H. Among three traits, empirical model developed for trait index D2H was found to be best fit (adj. R2 = 0.931). Using this model, the age-age correlations were predicted and efficiency of early selection in terms of gain per year for different plantation and rotation ages was estimated. For the selection age 12 years and rotation age 40 years, the genetic gain was almost twice. But this model is time dependent and does not take into account the growth rates. Another type of model based on variance ratio and a factor of relative size dependent growth was also applied. Predictions of age-age correlations were found to be better in case of D2H than height and dbh. According to this model, selection of progenies at 9 years age seems reasonably good for the improvement of height of Dalbergia sissoo.Keywords
Dalbergia sissoo Roxb., Age-age Correlation Models, Semi-arid Region, CentralIndia
- Accelerated Breeding Programme for Short Breeding Cycle and Early Evaluation of Neem Germplasm for Azadirachtin Content through Air-layering
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Indian Forester, Vol 127, No 5 (2001), Pagination: 595-598Abstract
No abstract- Linear Tree Growth Models: a Limitation of Negative Estimation of Size
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Indian Forester, Vol 126, No 12 (2000), Pagination: 1336-1341Abstract
The use of linear tree growth models, to describe the change in the size/response variate viz volume, biomass) with respect to the explanatory variate (height, diameter at breast height, age), is very common in forestry/agroforestry. However, these models may sometimes lead to misleading predictions viz 'negative estimation of size' exclusively for lower range of the explanatory variate. This study elaborates this issue and a feasible solution is proposed to overcome this problem. It is contrived that when the phenomenon is inherently undesirable, as the negative estimation of size in simple linear models for lower range of explanatory variable, to put implied lower bound on the raw values is most appropriate.- Studies on Mycoflora Affecting Pinus gerardiana (Chilgoza) Seeds and their Management
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Indian Forester, Vol 124, No 4 (1998), Pagination: 252-255Abstract
Ten fungi were found deteriorating the edible nuts of Pinus gerardiana (Chilgoza) of which Penicillium citrinum and Trichothecium roseum were the most predominant. Maximum spoilage (12 to 14%) in storage was however recorded on seeds stored in polythene bags, plastic containers and glass bottles, whereas seed stored in cloth bags, gunny bags, wooden boxes and cardboard boxes remained free from visible moldy growth even after nine months of storage where only 2 to 5% seed showed moldy growth. Out of seven fungicides tested, seeds treated with carbendazim (Bavistin, 0.05%), thiophenate methyl (Topsin, 0.05%) and benomyl (Benlate, 0.05%) provided significantly better control of P. citrinum when stored in cloth bags for nine months. However, insignificant results were obtained when seeds after fungicide treatment were stored in polythene bags.- A Note on the Physical and Mechanical Properties of Michelia champaca (Champ) from Digboi Division, Assam
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Indian Forester, Vol 113, No 3 (1987), Pagination: 202-213Abstract
Physical and Mechanical properties in green, airdry and kilndry conditions based upon tests conducted on small clear specimens obtained from four logs of Michelia champaca (Champ) from Assam have been reported. The results obtained have been compared with Michelia champaca from West Bengal and standard teak (from Malabar. Nilambur and Coimbatore). Suitability indices and safe working stresses have been reported and compared with the corresponding values of standard teak. It has been observed that the values are 20% lower than those of teak. The strength figures of this species from Assam have been found higher than the corresponding figures of this species from West Bengal.- A Note on Physical and Mechanical Properties of Acacia mearnsii (Syn. Acacia molussima) from Tamil Nadu
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Indian Forester, Vol 109, No 6 (1983), Pagination: 395-400Abstract
Physical and mechanical properties in green and kiln-dry conditions based upon tests conducted on small clear specimens of Acacia mearnsii from Madurai, North Division. Tamil Nadu have been reported. The result so obtained have been compared with Tectona grandis (Teak). Estimated values of different properties calculated from strength - specific gravity formulae have been reported and compared with observed values in green condition. Safe working stresses and tentative suitability indices have also been reported and compared with the corresponding values of Teak. It has been observed that this species is inferior to Teak. The observed values of this species are also found to be lower than the values expected from strength specific gravity relationship.- A Note on Physical and Mechanical Properties of Cinnamomum camphora (Cinnamon) from New Forest, Dehra Dun (U.P.)
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Indian Forester, Vol 108, No 6 (1982), Pagination: 438-443Abstract
Physical and mechanical tests were done in green and kiln dry conditions on small clear specimens obtained from 9 logs of cinnamomum camphora received from New forest, Dehra Dun. The relults obtained have been compared with Teak. It is found that valuel are lower than standard teak in general. Estimated values based on strength specific gravity formulae hive also been compared with observed values in green condition. The observed values are higher than estimated. Safe working stresses and suitability indices based on specific gravity have also been reported and compared with the corresponding values of Teak.- A Note of the Effect of Pin-holes on Strength of Timber
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Indian Forester, Vol 106, No 5 (1980), Pagination: 372-376Abstract
Stressing the need of knowledge of effect of defects in wood on it strength and general utilisation characters, the effect of pin-holes on the bending and compressive strength of Pinus roxburghii and Shorea robusta has been studied in some detail.- A Note on the Effect of Storing on the Glue Shear Strength of Tea Chest Plywood
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Indian Forester, Vol 106, No 9 (1980), Pagination: 614-616Abstract
A doubt has often been expressed that glue shear strength of standard quality tea-chest plywood is reduced under storage. This paper presents the results of a study to investigate the influence of storing upto about 2 years on the glue shear strength of tea-chest plywood. It has been found that upto one and half year there is very little loss of strength beyond it has gone upto 25.30°in some cases.- A Note on Physical and Mechanical Properties of Tetrameles nudiflora (Maina) from Assam
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Indian Forester, Vol 105, No 5 (1979), Pagination: 369-376Abstract
Physical and mchanical properties bave been evaluated and reported in green, air-dry and kilo-dry conditions based on small clear specimens obtained from five logs of Tetrameles nudiflora (Maina), received from Dhansiri Valley Division, Assam. The results obtained have been compared with standard Teak. It is found that values are much lower than standard Teak in general. Expected values based on strength specific gravity formulae have also been reported for comparison. Suitability indices have also been reported.- A Note on the Strength of Betula Alnoides from West Bengal
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Indian Forester, Vol 89, No 7 (1963), Pagination: 465-467Abstract
No abstract- Some Preliminary Observations in Non-Destructive Testing of Timber
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