T. C. Pokhriyal , S. P. Pant , S. R. Joshi

Abstract

No abstract

Full Text

     

E. R. C. Reynolds , R. M. Singhal , S. P. Pant

Abstract

Hydrologically it is important to distinguish phreatophytic vegetation, as the access to the water-table enables plants to transpire the full potential and not conserve water. However,there is much misunderstanding outside the hydrological discipline on the location and behaviour of the water-table. We describe the methods of wells and electrical resistivity which we have employed in the Terai Eucalyptus plantation to study the water-table, and we discuss the preliminary results which as yet demonstrate little direct abstraction by the trees from water-table deeper than 1.5 metres.

Full Text

     

B. G. Dabral , S. P. Pant , S. C. Pharasi

Abstract

The paper details the ischolar_main habits of Eucalyptus grown in isolation in pots and in a community In large sized lysimeters and in the plantation. Different ischolar_main habits were observed. In general, ischolar_mains avoid the path taken by existing ischolar_mains. Environment especially bulk density of the soli mass exerts a profound influence upon the ischolar_maining pattern. No interspecific or intraspecific ischolar_main grafting was observed but self-grafting was noticed in Eucalyptus hybrid ischolar_mains. The observations discussed in the paper are not exhaustive but indicative of the ischolar_main habits, this Species is capable of adopting. Considering the vast area, different soli types and agro-climatic zones, where Eucalyptus grows and managed by the differing silvicultural practices, the studies need to be taken up on widespread area. Tbe studies assume an added importance considering the large scale planting of Eucalyptus spp. In agro-forestry and social forestry.

Full Text

     

T. C. Pokhriyal , A. S. Raturi , S. P. Pant , S. K. Pande , S. K. Bhatnagar

Abstract

Nitrogen fixation studies were carried out in four tree species viz., Albizia lebbeck, Acacia nilotica, Dalbergia sisoo and Leucaena leucocephala under potculture conditions. Maximum plant height, nodule biomass, and nitrogenase (acetylene-ethylene reduction) activity was noticed in case of Leucaena followed by Albizia, Acacia and Dalbergia. The amount of n moles C₂ H₂, produced per plant h^-1 and per nodule h^-1 was 550.9 and 4.44 in Albizia, 488.88 and 4.40 in Acaica, 125 and 2.28 in Dalbergia and 1772.3 and 12.31 in Leucaena.

Full Text

     

B. G. Dabral , S. P. Pant , S. C. Pharasi

Abstract

No Abstract

Full Text

     

B. G. Dabral , S. P. Pant , S. C. Pharasi

Abstract

The paper details the ischolar_maining behaviour in Sal (Shorea robusta) tree at a site having compacted soil and with a hard pan formation. The tap-ischolar_main extended upto 1.2 m only. Lateral ischolar_mains extended upto a length of about 12 m in the direction of a 'nala', thereby sbowing that with shallow tap-ischolar_main, long lateral ischolar_mains running parallel to the soli layers get formed, to meet the water needs of the tree especially in hot dry season.

Full Text

     

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

Abstract

The width of annual rings was measured on 90 chirpine trees tapped for 5 years to different extent of their girth. Such measurements were also carried out on 9 untapped trees to compare the effect of tapping. The data showed that tapping significantly reduced the ring width during tapping period, the reduction being correlated to the effective width of the blaze. Tapping for 5 years with the normal (10 cm wide) blaze reduced the ring width by 14.3%. The trees tapped with the stimulant (20% solution of a mixture of Sulphuric and Nitric acids) showed on an average 3.5 percent greater decrease in the ring width than those tapped without any stimulant.

Full Text

   

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

Abstract

The yield of oleoresin obtained from 38 year old trees of slashpine (Pinus elliottii Engelm.) planted at Dehradun is compared with that of the indigenous Chirpine (Pinus roxburghii Sargent) or almost the same age and comparable diameter and crown development. Both the species were tapped for 2 years (1975 and 1976) by the normal Indian method with weekly freshenings. Slashpine was found to yield 84.8 percent (with an error of ± 8.8%) more resin than chirpine. It was observed that where as the average yield from chirpine was 1.901 kg the slashpine trees of almost the same age gave 3.516 kg of resin per season.

Full Text

     

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).

Full Text