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Com o objetivo de conhecer a quantidade de nitrogênio do ar fixado simbiòticamente pelas bactérias que vivem associadas às raízes da soja foi instalado o presente experimento, em vasos de Mitscherlich contendo terra-roxa-misturada, sendo os seguintes os tratamentos empregados: 1) testemunha; 2) NPK; 3) NPK + calcário; 4) NPK + inoculante; 5) NPK + calcário + inoculante; 6) PK + calcário + inoculante; 7) PK + calcário. O ensaio foi conduzido até a época do florescimento das plantas, quando então foram colhidas a parte aérea e a subterrânea, sêcas e analisadas em seu teor de nitrogênio. Os resultados obtidos permitem concluir que a soja não apresentou, neste experimento, grande capacidade fixadora de nitrogênio do ar atmosférico. The experiment reported in this paper was carried out to determine the amount of nitrogen fixed from the air by nodule bacteria associated with soybean roots. The soybean plants were sown in Mitscherlich pots filled with the "terra-roxa-misturada" type of soil that had received the following treatments: 1) check; 2) NPK; 3) NPK 4- limestone; 4) NPK + inoculant; 5) NPK + limestone + + inoculant; 6) PK + limestone + inoculant; and 7) PK + limestone. When the plants started to blossom, both the aerial part, as well as the roots were collected separately, dried, and analysed for their nitrogen content. The soil was also analysed prior to planting and after the plants had been harvested. The results indicated that under the conditions of the experiment the symbiotic association - nodule bacteria plus soybean - did not show, a great capacity for fixing nitrogen from the air

Fixação do nitrogênio do ar atmosférico pelas bactérias que vivem associadas às raízes da soja