V. P. Singh , J. C. Dagar

Abstract

The Himalayan region which was once ful of luxuriant forests with rich diversity of species is presently dwindling at fast rate due to large scale exploitation for fuelwood, fodder,timber and packing cases. The demand for these commodities may accomplished through agroforestry systems well blended with multipurpose forest tree species, horticultural tree species and crops or grasses. There is wide scope of silvi-pastural systems after closing the pastures from grazing. Results of a survey related to existing agroforestry systems along with various constraints and the adaptability of agroforestry systems have been discussed. Economic yield and productivity from agri-silvihorticultural systems was maximum as compared to other agroforestry systems.

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J. C. Dagar , Virendra Kumar

Abstract

Agro-forestry is as relevent, meaningful and useful for Bay Islands as it is for any other part of country. Climate, topography, accessibility and cultivation condition of the islands are different than the rest of the country and so are the agro-forestry systems and some of them are quite specific to the islands. Large natural forest area, climate, topography, accessibility, local needs and land holding conditions strongly influence on fitness of agro-forestry systems for the islands. Suitable tree, shrub and herb species for different agro-forestry systems are mentioned.

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J. C. Dagar , A. Jeyamurthy

Abstract

The studies were carried out on the distribution of dependent vascular plants on their host in the tropical rain forests of South Andaman which is the longest island with maximum human activities. The results showed that the large woody climbers or lianes are the most impressive feature. Most of tbe epiphytic orchids are rare and endemic.

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A. S. Ahlawat , J. C. Dagar

Abstract

In the present investigation effects of pH, light qualities and some growth regulators on seed germination ofBidens biternata-a medicinal herb of family Asteraceae, have been investigated. At pH 2.5 there was complete inhibition of germination but the germination percentage gradually increased from pH 3 pH 7. Again in the basic medium there was decline and at pH 9 percentage germination was again zero red light prompted seed germination, yellow and continuous lights showed little effect while blue and green lights inhibited. IAA and IPA enhanced germination percentage at lower concentrations ( up to 10 ppm) but the higher concentrations of these substances proved inhibitory, GA₃, enhanced germination upto 50 ppm.

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A. S. Aiilawat , J. C. Dagar

Abstract

Nitrogen, phosphorus and potassium fertilizers individually as well as in different combination have great impact on growth and photosynthetic pigments of Bidens biternata (Lour.) Merr. & Sherff, a medicinal herb. Nitrogen plays a great role in various growth parameters and photosynthetic pigments specially when it was supplied in combinations with potassium, phosphorus or both. Potassium and phusporus when supplied individually or in combinations with one another, were found to retard dry matter production of ischolar_mains and shoots, photosynthetic pigments, RGR, NAR, LAI along with flower and achene production.

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