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Ecological Section

Sharma, Satyawati [1], Kashyap, Suman [1], Vasudevan, Padma [1].

Role of bioinoculants and mycorrhizae in sustainable agroforestry systems.

World wide about 950 millions ha of land are affected by salinity and alkalinity and about 7 millions ha of such land are in India. The salt affected soils, suffering from either salinity or alkalinity, negatively affect soil fertility. The use of chemicals to neutralise such soils is expensive and hazardous to environment and health. Hence, biological means to counteract the alkalinity need to be explored and exploited. The objective of this paper is to discuss the potential role of bioinoculants like Azotobacter and mycorrhizae for sustainalble agroforestry systems in alkaline areas.The studies were conducted to culture native Arbuscular Mycorrhiza fungi (AMF) o要 alkaline soil and study the efficacy of the native and exotic strains of AMF and Azotobacter in four vegetable crops [Brassica oleracea var. capitata, Allium cepa, Solanum melongena and Brassica oleracea var. botrytis] separately as well as in combination o要 alkaline soil under field conditions. The R. communis was found to be the suitable host plant for AM culturing o要 normal soil and T. foenum graecum o要 alkaline, however, alkalinity affected the germination and survival %age of R. communis and Zea mays plants significantly. The combined inoculation of native AM fungi and Azotobacter in B. oleracea var. capitata and B. oleracea var. botrytis resulted in maximum fruit yield and plant growth, may be due to better uptake of nutrients, secretion of phospho-enzyme and other growth promoting substances and by inhibiting adverse effect of the root exudates of Brassica sp. In case of Allium cepa (onion), Azotobacter (native strain) and in Solanum melongena (eggplant) native AM fungi produced results at par with AMF + Azotobacter. Overall, the native strains of bioinoculants isolated from native (local) alkaline soils were found to be more effective, adaptive and tolerant to alkalinity than exotic o要e.

1 - Indian Institute of Technology Delhi, Centre for Rural Development and Technology, Hauz Khas, New Delhi, New Delhi, 110016, India

none specified

Presentation Type: Paper
Session: 40-5
Location: Wasatch (Cliff Lodge)
Date: Tuesday, August 3rd, 2004
Time: 3:30 PM
Abstract ID:50

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