745 research outputs found
Growth Responses of \u3ci\u3eAcacia angustissima\u3c/i\u3e to Vesicular-Arbuscular Mycorrhizal Inoculation
The response of Acacia angustissima to VAM species (Acaulospora laevis, A. muricata, Entrophosphora colombiana, Glomus mosseae, G. fasciculatum, G. macrocarpum, G. etunicatum, Gigaspora margarita, G. gigantea and Scutellospora heterogama) was evaluated under greenhouse conditions, in a P-deficient clayey Oxisol of pH 5.5. The soil was sterilized at 110oC for one hour each day for three days and reinoculated with a soil microbial suspension free of mycorrhizal fungi spores. The several VAM fungi were effective in increasing DM yield, nodulation, and N and P uptake of A. angustissima plants. The most efficient species were E. colombiana, A. muricata, and S. heterogama
Agronomic Evaluation of Forage Grasses under Mature Rubber Plantation
The agronomic performance of seven forage grasses, under a mature rubber plantation, was assessed in a cutting trial carried out at Porto Velho, RondƓnia. During the rainy season, the higher dry matter yields were obtained with B. brizantha, P. atratum BRA-9610 and B. humidicola. During the dry season, the grasses more productive were B. brizantha and P. atratum BRA-9610. In both seasons, magnesium and potassium contents did not vary among grasses. During the rainy season, the higher nitrogen and phosphorus contents were obtained with P. regnelli BRA-0159 and, P. guenoarum BRA-3824 and B. humidicola, respectively, while P. atratum BRA-9610 and B. humidicola provided higher contents of calcium. During the dry season, P. regnelli BRA-0159 showed the highest nitrogen content, while B. humidicola and B. brizantha gave the highest phosphorus and calcium contents. In order to obtain greater forage yields with better quality, the grasses more promising for pasture establishment in a silvipastoral systems were B. brizantha, B. humidicola and P. atratum BRA-9610
Efeito de micorrizas arbusculares sobre o crescimento e nutriĆ§Ć£o mineral de Brachiaria brizantha c.v Marandu.
O efeito da inoculaĆ§Ć£o de micorrizas arbusculares (MA) sobre o crescimento ...., foi avaliado sob condiƧƵes de casa-de-vegetaĆ§Ć£o. Foram avaliados oito espĆ©cies de MA: Glomus mossaea, G. fasciculatum, G. etunicatum, G. macrocarpum, Gigaspora margarita, Scutellospora heterogama, Acaulospora laevis e A. muricata.bitstream/item/67179/1/FOL-5289-5879id-.pd
Efeito de micorrizas arbusculares e adubaĆ§Ć£o com fosfato de rocha em Sesbania sesban.
No presente trabalho avaliou-se os efeitos da inoculaĆ§Ć£o de MA e da aplicaĆ§Ć£o de fosfato de rocha sobre o rendimento de forragem e composiĆ§Ć£o quĆmica de Sesbania sesban.bitstream/item/60899/1/COT-194-micorrizasarburscular....pd
InoculaĆ§Ć£o de micorrizas arbusculares em Sesbania sesban.
Este trabalho teve como objetivo avaliar o efeito da inoculaĆ§Ć£o de micorrizas arbusculares sobre a produĆ§Ć£o de biomassa e composiĆ§Ć£o quĆmica de Sesbania sesban
SDSSJ143244.91+301435.3: a link between radio-loud narrow-line Seyfert 1 galaxies and compact steep-spectrum radio sources?
We present SDSSJ143244.91+301435.3, a new case of radio-loud narrow line
Seyfert 1 (RL NLS1) with a relatively high radio power (P1.4GHz=2.1x10^25 W
Hz^-1) and large radioloudness parameter (R1.4=600+/-100). The radio source is
compact with a linear size below ~1.4 kpc but, contrary to most of the RL NLS1
discovered so far with such a high R1.4, its radio spectrum is very steep
(alpha=0.93) and not supporting a 'blazar-like' nature. Both the small mass of
the central super-massive black-hole and the high accretion rate relative to
the Eddington limit estimated for this object (3.2x10^7 Msun and 0.27,
respectively, with a formal error of ~0.4 dex on both quantities) are typical
of the class of NLS1. Through a modeling of the spectral energy distribution of
the source we have found that the galaxy hosting SDSSJ143244.91+301435.3 is
undergoing a quite intense star-formation (SFR=50 Msun y^-1) which, however, is
expected to contribute only marginally (~1 per cent) to the observed radio
emission. The radio properties of SDSSJ143244.91+301435.3 are remarkably
similar to those of compact steep spectrum (CSS) radio sources, a class of AGN
mostly composed by young radio galaxies. This may suggest a direct link between
these two classes of AGN, with the CSS sources possibly representing the
misaligned version (the so-called parent population) of RL NLS1 showing blazar
characteristics.Comment: 14 pages, 7 figures, 4 tables, accepted for publication in MNRA
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