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K. K. Srivastava , V. Mohan , Neelam Verma

Abstract

Use of biofertilizer particularly VAM fungi has a great importance in forestry as it provides minerals, wide absorption area of ischolar_main zone, water uptake and tolerance to water stress conditions etc. Rajasthan covers about 61% of the geographical area of the total desert area of the country. In these harsh conditions, VAM fungi can play a significant role in survival of plants. In the present study some economically important tree species of Jaipur region namely Cordia myxa, Artocarpus integrifolia. Dalbergia sissoo, Pongamia pinnata, Mangifera indica and Alestronia sp. Were seleded for the study. VAM inoculated seedlings of above tree species performed better in term of shoot height, ischolar_main height, biomass and percentage of colonization. The shoot height inerease was maximum (32.2%) in A, integrifolia and minimum (11.2%) in Mangifera indica. The other parameters were also found better then uninoculateel plants.

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Neelam Verma , J. C. Tarafdar , K. K. Srivastava

Abstract

Prosopis cineraria was grown in a green house in a low phosphorus (4 mg kg^-1 Olsen's P) soil (Typic Camborthid) under arid environment inoculated with alone or mixed AM fungi either indigenous or from outside sources. Uptake of relatively immobile soil nutrients (P, Zn, Cu) as affected by different AM fungi was also studied. In general, significant and positive response of plant height, ischolar_main and shoot biomass, ischolar_main colonization and AM fungal population was observed in inoculated plants as compared to control. Inoculated plants had significantly higher P, Zn and Cu concentration as well as upto three times more total uptake. Mycorrhizal dependency to P. cineraria varied between 13.76 and 56.28%, which was more to Glomus aggregatum. In general, G. aggregatum was found to be the most efficient AM species for growth and nutrition of P. cineraria plant.

Keywords

Arbuscular Mycorrhizal Fungi, Biomass Production, Prosopis cineraria, Glomus aggregatum

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K. K. Srivastava , Neelam Verma , K. C. Jedia

Abstract

No abstract

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K. K. Srivastava , R. Prabhakaran , Neelam Verma

Abstract

No abstract

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V. Mohan , Neelam Verma , Y. P. Singh

Abstract

Occurrence of VAM fungi is ubiquitous and are found in most ecosystems including arid- and semi-arid deserts. A survey for collection of ischolar_mains and rhizosphere soil samples of neem from various Forest Department nurseries and plantations in arid zone of Rajasthan revealed variation in per cent ischolar_main infection and number of VAM propagules in the rhizosphere soil samples. It has been observed that mean number of VAM fungal propagules and per cent ischolar_main infection were greater in plantation samples than in nursery samples. Different VAM fungi have been isolated, of which the genus Glomus is dominant with an exception of Sclerocystis in plantations. Among the Glomus spp., G. fasciculatum is the most predominant one in both nursery and plantation. The significance of these findings is discussed.

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Neelam Verma ¹, Rahul Devrani ¹, Vimal Singh ¹

Affiliations
1 Department of Geology, Centre for Advanced Studies, Chhatra Marg, University of Delhi, Delhi 110 007, IN

Abstract

The length of the main trunk in a river basin is an important morphometric parameter and it depends on the size of the drainage basin. The Ganga River Basin is one of the largest basins in the world with the Ganga River considered to be the main stem. Variable lengths of this river in the literature motivated us to study its exact length and also to test whether geomorphically it is the longest river in the basin. The results show that the maximum river length of 2758 km is attained when source is considered at the headstream of the Tons River. This length is more than any of the traditional lengths of the Ganga River in the literature. We propose to call the longest segment of the river in Ganga Basin as the Himalayan Foreland River.

Keywords

Ganga Basin, Drainage Network, Headwater, River Length, Source Stream.

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