H. B. Joshi

Abstract

The Himalayan region has a unique importance for the rest of India, dominating as it does the climate the water Source etc. Environmental conservation of the Himalayan region when translated in actionable terms means to develop an integrated land use pattern according to natural suitability of the land, adoption of conservation promoting techniques in each land use, regulating activities like industrialization in consonance with environmental conservation and management of all natural resoures.

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H. B. Joshi

Abstract

Robinia pseudo-acacia L. (Leguminosae, Papilionatae), due to its multi-purpose use in soil conservation, as a leaf fodder, fuel and medium quality timber, has been used widely as an exotic for planting all over the world in temperate zone. In India it has been planted fairly extensively in Jammu and Kashmir and Hamachal, hut in U.P. hills, it has been tried only sporadically on road-sides and compounds. Attempts to raise it gave only partial success for some years, and only in past 2-3 years encouraging results have been achieved in a few localities like Lohaghat in Pithoragarh Forest Division, Korwa in Chakrata Forest Division and Gaja in Nainital Forest Division. The article gives an account of sites and trial plantations, Forest to identify characteristics of sites where success has been achieved and gives outline of programme for future in extending the trial of this species which can be of real benefit to local economy. Robinia pseudo-acocia L. (Leguminosae, Papilionaceae), variously called as Black Locust, False Acacia or simply Robinia. is a native of Appalachian mountains of eastern North America, It is a medium-sized, handsome tree, growing to a height of about 24 metres. The species belongs to tile summer rainfall zone of the U.S.A., with an annual rainfall range of 1000 to 1375 mm and a mean annual temperature of 10 to 16°C. It is a pioneering species there, coming naturally on abondoned farm land. It suckers freely and regenerates easily from seed as. well as coppice. It is extensively used in soil conservation, as a soil stabilizer and improver in the afforestation of barren land.

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Jayanti Prasad , H. B. Joshi

Abstract

Experiments to study the increase in resin yield through the application of chemical stimulants were undertaken during 1968 and 1969 by Silviculture Hill Division, U.P. at Ranikhet in consultation with F.R.I. From the treatments increases in resin yield from 26% to 33% have been achieved, in line with similiar results reported in F.R.I. experiments. The observations indicate that acid mixture of sulphuric and nitric acids in equal strengths of 20 to 25%, both in spray and kaolin paste positive results.

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H. B. Joshi

Abstract

No abstract

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H. B. Joshi

Abstract

Observations made on the occlusion of resin-channels on a single tree of Pinus roxburghii Sarg. (Chir pine) tapped for resin under light continuous system for 42 years are given. The data indicate that under such tapping, a quinquennial channel is occluded in about 30 years, occlusion rate being highest at the top and bottom of the channel and least in the middle zone. Occlusion rate is adversely affected if channel width and depth exceed the prescribed standards, more so if severe fires run over the channels. Under standard light tapping conditions old channels are occluded by the time a second round of tapping starts and if the tree is still unfelled, there is space even for a third round of tapping.

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