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J. S. Samra , P. S. Payal , S. D. Sharma

Abstract

This investigation was undertake on Northern and Southern aspects of two ranges of hills separated by a narrow long valley. Sal (Shores robusta) is the predominant natural vegetation in the upper storey. Quality class of Sal ranged from 1.0 to 3.14 in Haplustalfs, 2.15 to 2.50 in Argiustolls and 1.86 to 2.30 in Haplustolls. Best quality class 1 of Sal was observed in Hapluatalfs on Northern aspect. However growth performance within a given level of taxa varied considerably mostly due to land and to some extent due to soil characteristics. In coarse loamy skeletal Udic Haplustolls and sandy skeletal Typic Udortha is, presence of gravels reduces the effective volume of soil which gets compensated to some extent due to deeder penetration of ischolar_mains but quality is next to Udic Haplustalfs. From morphological characteristics and evidences of phytocycling of Ca and Mg it seems that interactions of natural vegetation and soil development very considerably in different soils. Haplustalfs on Northern aspect which receive more solar radiation and where growth of vegetation is better represent more developed soils as compared to Southern aspects.

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N. K. Gulati , R. R. Fernandez , P. S. Payal

Abstract

Results of experiments in the tapping of Blue pine, carried out at Kanasar in Chakrata Division have revealed that application of stimulants like 2, 4-D, 2,4, 5-T and MCPA prolong the tapping period and thereby increases the resin yield. Trees tapped for full tapping season i.e. April to November yielded 2.1 to 2.28 kg oleo-resin per tree which is definitely an economically viable proposition especially keeping in view the higher pinene contents in the turpentine oil obtained from blue pine oleo-resin which increases its value.

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V. P. S. Verma , P. S. Payal , S. P. Pant

Abstract

The paper gives the result of observations made on the resin yield from chirpine (Pinuus roxburghii Sargent) with various non corrosive chemical compounds including some auxin herbicides. A 2% aqueous solution of 2, 4-D was found most effective followed by the paste of lime and 3% solution of 2,4,5-T. All chemical compounds were found more effective during summer season (April to June).

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V. P. S. Verma , P. S. Payal

Abstract

The paper gives the data of resin yield obtained from various numbers of 20 cm and 40 cm wide blazes as compared to 10 cm wide blaze from 1972 to 1974. The data from untreated blazes as well as those treated with a 20% mixture of Sulphuric and nitric acids is given. The maximum average yield obtained during 3 years from untreated blazes was 13.225 kg per tree and from the treated blazes was 17.268 kg per tree which was obtained when 45.8% and 61.4% of the girth from untreated and treated trees respectively was wounded. More than one narrow blaze together yield more resin than a single blaze of equivalent width.

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D. K. Deshmukh , P. S. Payal

Abstract

The article deals with both climatic and edaphic factors affecting resin yield during various months of a tapping season. Amongst these factors evapotranspiration seems to be the most important factor. Response to these factors seems to vary with plantations raised from different seed origins. The article also attempts to give a formula for estimation of resin yield.

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