inoculantes e fertilizantes foliares na soja em área de populações estabelecidas de bradyrhizobium sob sistema plantio direto inoculant and foliar fertilizer in soybean under no-tillage cultivated in areas with established bradyrhizobium populations

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ID: 144187
2006
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Abstract
O trabalho foi realizado em soja nos anos agrícolas de 1996/97, 1997/98 e 2000/01, objetivando avaliar a eficiência de formulações de inoculantes comerciais, isolados e associados a fertilizantes foliares à base de Mo e Co, em área de populações estabelecidas de Bradyrhizobium. Os experimentos foram instalados em Cruz Alta (RS), em áreas sob sistema plantio direto de 8 a 12 anos. No ano agrícola 1996/97, foram usados os tratamentos: testemunha sem inoculação; 200 kg ha-1 de N, parcelados; inoculante Nitragin Cell-Tech por 50 ou 80 kg de semente, com ou sem fungicida, e com ou sem fertilizante foliar Basfoliar Co Mol; inoculante Emerge Pó; inoculante Emerge PM e Basfoliar Co Mol. Em 1997/98, além da testemunha sem inoculação, utilizaram-se os inoculantes Emerge Pó; Emerge PM; Nitragin Cell-Tech e Rizo-liq, Nitragin Cell-Tech + Basfoliar Co Mol e Basfoliar Co Mol. No ano agrícola 2000/2001, os tratamentos foram: testemunha sem inoculação; 200 kg ha-1 de N, parcelados; inoculante turfoso padrão; Emerge PM; Rizo-liq Plus; Rizo-liq Plus + fertilizante foliar Rizomicro; Rizomicro; Gelfix; Gelfix + fertilizante foliar CoMofix; Rhizofix; Rhizofix + CoMofix; CoMofix e inoculante Bionutri. Nos três anos agrícolas avaliados, não houve diferenças entre os tratamentos para matéria seca de raízes, teor de N total no grão e produtividade de grãos. Somente no ano agrícola 1997/98, a matéria seca da parte aérea apresentou diferença entre os tratamentos, com destaque para Nitragin Cell-Tech + Basfoliar Co Mol. O tratamento com 200 kg ha-1 de N reduziu a massa de nódulos. As plantas de soja não responderam à prática da inoculação, porque, provavelmente, as populações de Bradyrhizobium existentes no solo já apresentavam estirpes eficientes e em número adequado.
This study was carried out in 1996/97, 1997/98 and 2000/01 crop seasons in Cruz Alta, state of Rio Grande do Sul, Brazil, aiming at evaluating the efficiency of commercial inoculant formulations, isolated and in combination with Mo and Co foliar fertilizer in an area that has been under no tillage for eight to twelve year and where Bradyrhizobium had already been established. In the 1996/97 crop year, the treatments were: non-inoculated control; 200 kg ha-1 of nitrogen fertilizer, split twice and without inoculation; inoculant Nitragin Cell-Tech/50 and 80 kg seeds, with and without fungicide and, with and without foliar fertilizer Basfoliar Co Mol; inoculant Emerge Pó; inoculant Emerge PM and, Basfoliar Co Mol. In the 1997/98 crop year, the treatments were: non-inoculated control; the inoculants Emerge Pó; Emerge PM; Nitragin Cell-Tech and Rizo-liq; Nitragin Cell-Tech + Basfoliar Co Mol and Basfoliar Co Mol. In the 2000/01 crop year, the treatments were: non-inoculated control; 200 kg ha-1 nitrogen fertilizer, split twice and without inoculation; inoculant standard; Emerge PM; Rizo-liq Plus; Rizo-liq Plus + foliar fertilizer Rizomicro; Rizomicro; Gelfix; Gelfix + foliar fertilizer CoMofix; Rhizofix; Rhizofix + CoMofix; CoMofix and inoculant Bionutri. The root dry matter, N grain content and grain yield did not differ among treatments in the three cropping seasons. Only in the 1997/98 crop season there were differences in plant height between treatments, with better results with Nitragin Cell Tech + Co Mol. The application of 200 kg ha-1 of nitrogen fertilizer decreased the nodule weight. The lack of response of soybean to inoculation can be attributed to the established population of Bradyrhizobium, which were in appropriate number and efficiency.
Reference Key
campos2006revistainoculantes Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors ;Ben-Hur Costa de Campos;Valderi Gnatta
Journal Revista de saude publica
Year 2006
DOI
10.1590/S0100-06832006000100008
URL
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832006000100008
Keywords
nodulation inoculation glycine max coagriculture (general)

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