Record ID No. |
278 |
Author(s) |
Rodrigues L.A., Martins M.S., Salomao M.S.M.B. , 2003 |
Affiliation |
Universidade Estadual Norte Fluminense, Centro de Ciências e Tecnologias Agropecuárias (CCTA), Av Alberto Lamego 2000, Campos Goytacazes, BR-28013600 Campos Dos Goytacazes, RJ, Brazil |
Title |
Use of mycorrhizas and rhizobium in intercropping system of Eucalyptus and Sesbania. I - Growth, uptake and transfer of nitrogen between plants |
Source. Vol.(no):Page |
Revista Brasileira de Ciencia Do Solo. 27(4): 583-591p. |
Categories |
Arbuscular Mycorrhiza |
Subjects |
Soil plant relations |
Sub-subjects |
Cropping effect |
Host |
Eucalyptus grandis, Sesbania virgata |
Organism |
Rhizobium |
Country |
Brazil, S. America |
Abstracts |
This greenhouse experiment was carried out to evaluate the effects of arbuscular mycorrhizal fungi (AMF) and Rhizobium on dry matter production, N uptake and efficiency of use in Eucalyptus grandis and Sesbania virgata plants grown in intercropping systems. The transfer of N from Sesbania virgata to Eucalyptus was also evaluated, using the isotope N-15. The treatments were: with or without inoculation of both plant species with AMF and with or without inoculation of S. Virgata with Rhizobium. Plastic pots divided in three compartments (A, B, and C), with a volume of 2 L were used. A and B compartments were separated by a plastic division, while between the B and C compartments a nylon mesh screen (40 mum) allowed the penetration of hyphae only, not of plant roots. Root systems of the S. Virgata plants were divided between the compartments A and B at planting, and Eucalyptus plants were cultivated in the compartment C. Seven mg kg(-1) of N-15-(NH4)(2)SO4 with 99% of N-15 were applied in compartment A. The plants were grown for 100 days and then harvested. In Eucalyptus plants, the Rhizobium, AMF and AMF + Rhizobium treatments increased the dry matter production by 119, 223, and 209%, respectively, and the N content by 125, 247, and 310%, respectively, in relation to control plants. In S. Virgata plants, all treatments inoculated with microorganisms increased the N content and decreased the C/N rate. The efficiency of N use was greater in Eucalyptus plants inoculated with AMF and did not vary with the treatments in sesbania. A transfer of N-15 from S. Virgata to Eucalyptus plants was observed in all treatments |