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vol.66 issue2PHYTOGEOGRAPHIC RELATIONSHIPS OF SPERMATOPHYTES ON THE RAINFOREST OF THE EASTERN REGION OF CUBATHE GENUS HYDROLITHON FOSLIE (CORALLINALES, RHODOPHYTA) ALONG THE ATLANTIC AND CARIBBEAN COASTS OF MEXICO author indexsubject indexarticles search
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Gayana. Botánica

Print version ISSN 0016-5301On-line version ISSN 0717-6643

Abstract

RUIZ-VALDIVIEZO, Víctor M et al. EFFECTS OF INORGANIC FERTILIZERS AND RHIZOBIAL INOCULATION ON GROWTH, NODULATION AND TANNIN CONTENT OF ACACIELLA ANGUSTISSIMA (MILL.) BRITTON & ROSE. Gayana Bot. [online]. 2009, vol.66, n.2, pp.206-217. ISSN 0016-5301.  http://dx.doi.org/10.4067/S0717-66432009000200007.

The effects of different inorganic fertilizers and rhizobial inoculation on shoot height, total shoot and root dry weight, nodule number, total shoot nitrogen, nitrogenase activity and tannic acid content of Acaciella angustissima (Mill.) Britton & Rose were investigated in the laboratory. Seedlings were grown in a climate chamber in glass tubes containing sterilized mixture of vermiculite and peat moss, and treated with combinations of nitrogen (N) at 45 mg plant1, phosphorus (P) at 30 mg plant1, potassium (K) at 20 mg plant1 and inoculated with the bacterium Sinorhizobium mexicanum. The combined applications of N, P or K to uninoculated plants increased shoot height and dry weight as compared to the unamended plantlets. The tannin content in uninoculated plants was highest when amended with P+K. Treatment had a significant effect on plant growth, nodulation and tannin content varied. The plants treated with P + K + S. mexicanum had significantly longer shoot height, total shoot and root dry weight, nodule number, total shoot nitrogen, nitrogenase activity and tannic acid content in comparison with unamended plants. It was found that N reduced number of nodules, tannin content and nitrogenase activity of A. angustisisma. As such, farmers should refrain from applying N fertilizer, but could apply P and K to maximize tannin production in A. angustissima.

Keywords : Acetylene reduction; growth chamber; N P K fertilizer; Sinorhizobium mexicanum.

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