P. Bora , P. K. Khosla

Abstract

Cuttings prepared from the terminal portion of the shoots of current year growth of 12 year old Chir pine (Pinus roxburghii Sarg.) plants ischolar_mained under mist. Four ischolar_maining powder mixtures of 0, 0.5, 1.0 and 1.5 per cent IBA with 10 per cent each of sucrose and captan in talc were tested. As high as 31.25 per cent mean ischolar_maining and better ischolar_main quality were observed in mixture containing 1 per cent IBA and 10 per cent each of sucrose and captan.

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G. S. Deol , P. K. Khosla

Abstract

Clonal material of Populus ciliata Wall. ex Royle, collected from two provenances Karain Bibal (1800 m, 32.14°N, 77.11°E) and Kangni (2400 m, 32.19°N, 77.10°E) in the Kulu Forest Division, was tested for responsiveness to nitrogen fertilization in a nursery trial. Soil of the experimental area was medium in N, P and K supplies with a sandy loam texture. Calcium ammonium nitrate was used as a source for four levels (0,30, 60, 90 kg/ha) of nitrogen. Both the provenances exhibited enhanced growth with the application of nitrogen. Plant height, collar diameter, internodal length, total biomass, foliar nitrogen and fibre length significantly Increased upto the application of 60 N/ha. The specific gravity was maximum with 30 kg N/ha and decreased wilh higher levels. On an average application of 90 kg N/ha resulted in an insignificant decrease in all the growth characters. Karaln Bihal provenance, representing the lower range of distribution of the species with better growth performance, tended to be more responsive to nitrogen fertilization in all growth characters studied except specific gravity, as compared to Kangni provenance, inhibiting higher zone with coniferous association. Karain Bihal provenance, representing the lower range of distribution of the species with better growth performance, tended to be more responsive to nitrogen fertilization in all growth characters studied except specific gravity, as compared to Kangni provenance, inhibiting higher zone with coniferous association.

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G. S. Deol , P. K. Khosla

Abstract

Effect of size of stem cuttings on first season's growth of Populus ciliata was observed in a nursery trial. Increase in the diameter as well as length of the cuttings significantly increased number of ischolar_mains, average ischolar_main length, number of leaves and average leaf area resulting in dilfferntial shoot growth. The increased plant growth with larger sized cuttings (mid dia = 18 mm, length = 30 cm, D₂L₃) suggests direct field planting ot these cuttings at moisture rich sites. However, for clonal propagation at nursery stage, stem cuttings with 22.5 cm length and 14 mm mid dia are recommended.

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P. K. Khosla

Abstract

Dobineae, a small tribe of Anacardiaceae, with 2 genera namely Dobinea Buch. Ham, ex D. Don and Campylopetalum Forman is distributed in the Sikkim Himalaya and Yunnan and Thailand respectively. The consistency of diploid chromosome complement of 14 in both the genera. is a cytological evidence to revive family status, Podaceae Baillon ex Franchet, for the tribe.

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