Eficiência do uso de fertilizantes, fungicidas e inoculante no tratamento de sementes de soja / Efficiency of fertilizers, fungicides and inoculant utilization in the soybean seed treatment

AUTOR(ES)
DATA DE PUBLICAÇÃO

2009

RESUMO

With the purpose of evaluating the efficiency of fertilizers (with macronutrients - nitrogen, phosphorus and potassium - and micronutrients - cobalt e molybdenum), fungicides and inoculant utilization in the soybean (cultivar FT-Abyara) seed treatment, two experiments were carried out, in laboratory (2007) and in field (season 2007/2008), at Biology Department of Federal University of Santa Maria, in Santa Maria, Rio Grande do SulState, Brazil. The experiment I consisted of evaluating the macronutrients and micronutrients doses treatments mixed with fungicides (Thiram and Carbendazim) applied in the YMA culture medium of Bradyrhizobium spp. The experiment II consisted of evaluating the soybean seed treatment (with micronutrients and fungicides) effect on Bradyrhizobium spp. survival and its influence on the plant growth. In relation to different evaluated fertilizers, the higher number of nodules per plant and higher nodules dry mass were obtained with cobalt and molybdenum seed treatments. Similar results also were obtained with fungicides treatments. According to the results, all treatments with fertilizers increased the soybean plant height, root length, dry matter of canopy and roots when compared to the control (without fertilizers, fungicides and inoculant). According to the results, there are the following conclusions: (i) the seed treatment with fungicides decreases the viable cells number of Bradyrhizobium spp.; (ii) the utilization of cobalt and molybdenum in the seed treatment increases the Bradyrhizobium spp. cells number; and (iii) the best parameter to evaluate the seed treatment inoculation efficiency is the viable cells number of Bradyrhizobium spp.

ASSUNTO(S)

glycine max cobalt molibdênio fertilizantes cobalto bradyrhizobium soja. molybdenum. macronutrients

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