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Insecticide treatment, film coating and rizobium soybean seed inoculationThe treatment of soybean seeds with chemical products to control pests may impair seed quality and the establishment of the rizobium-plant symbiosis. The aim of this work was to evaluate the performance of soybean seeds treated with insecticides and film coating, as well as the nodulation and plant growth. Soybean seeds were treated with insecticides and polymer in a 6x2 factorial scheme. The insecticides used in the treatments were carbosulfan, clotianidina, fipronil, imidacloprid, tiametoxan and a control without insecticides. Insecticides were applied with and without the polymer, as well as the control. Seeds were evaluated by the germination test, cold test and seedling emergence. In addition, they were inoculated with the strains BR86 and BR96, separately, and sowed in Leonard pots. During the flowering, the plants were evaluated using the number and dry matter of nodules and of the aerial part. The insecticide treatments can Recebido para publicação em abril de 2009 e aprovado em setembro de 2010 1 Parte da tese apresentada à Universidade Federal de Lavras pelo primeiro autor para obtenção do título de doutor.

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The objective of this study was to evaluate the effects of inoculation with different arbuscular mycorrhizal fungi native to Cerrado, associated with the application of colonization stimulant (7-hydroxy, 4’-methoxy-isoflavone) at the initial growth of cotton and maize plants in a greenhouse. The experiment was carried out in a completely randomized design and 7x2 factorial scheme, with five species of arbuscular mycorrhizal fungi and combined inoculation (uniting all species in equal proportion) and native fungi, in the presence and absence of colonization stimulant in maize and cotton crops. Shoots dry matter (SDM), roots dry matter (RDM), mycorrhizal colonization and accumulation of calcium, zinc and phosphorus in the SDM were evaluated at flowering. Inoculation of arbuscular mycorrhizal fungi and the use of colonization stimulant at low density of arbuscular mycorrhizal fungi propagules was beneficial to plant development. Inoculation with mycorrhizal fungi demonstrated different effects for the various parameters evaluated in cotton and maize, and the application of colonization stimulant promoted higher mycorrhizal colonization and initial growth in cotton, when associated with native AMF, and in corn, when associated with inoculation with Dentiscutata heterogama, Gigaspora margarita and Rhizophagus clarus.

Substratos para o crescimento de mudas de Trema micrantha (L.) Blumes RESUMOO objetivo deste estudo foi avaliar o efeito do composto de lixo urbano e da calagem no crescimento inicial de mudas de candiúba (Trema micrantha L.-Ulmaceae), cultivadas em tubetes. Para isto, instalou-se um experimento em casa de vegetação, disposto em delineamento inteiramente casualizado, em esquema fatorial 2 x 5, em amostras de Latossolo vermelho distroférrico com e sem calagem e cinco proporções de composto de lixo urbano misturados ao solo: 0, 10, 20, 40 e 80% v/v, sem adubação complementar, com cinco repetições. Ao final de 120 dias de condução do experimento, as mudas foram coletadas para as determinações: da matéria seca da parte aérea, da raiz e total, e a relação entre matéria seca da parte aérea e matéria seca da raiz. O efeito da calagem e a interação calagem-composto de lixo não foram significativos nas variáveis analisadas. O composto de lixo proporcionou aumento na produção de matéria seca das mudas. Estes efeitos variaram de acordo com as proporções de composto empregadas, sendo a proporção média de 54,7% de composto de lixo urbano e 45,3% de Latossolo vermelho distroférrico, que favorece a produção da matéria seca das mudas de candiúba.Palavras-chave: Adubação, calagem, composto de lixo urbano, leguminosa Substrates for Trema micrantha (L.) Blumes seedlings growth ABSTRACTThis study aimed at assessing the effects of solid urban waste and liming in the initial growth of Trema micrantha (L. Ulmaceae) seedlings in tubes. To conduct the study, an experiment was installed in a greenhouse, displayed in a completely randomized design, in a factorial scheme 2x5, in samples of Red Distroferric Latossol (Oxisol) with and without liming and five proportions of urban waste compost: 0; 10; 20; 40 and 80% v/v, without complementary fertilization, with five replications. 120 days after the beginning of the experiment, the seedlings were collected to determine: shoot dry matter, root dry matter and total dry matter, as well as the relation between shoot dry matter and root dry matter. There was no significant effect of lime nor its interaction with waste compost in the parameters evaluated. Waste compost increased seedlings shoot dry matter production. Such effects varied according to the proportions of compost used. The average proportion was 54.7% of solid urban waste and 45.3% of Red Distroferric Latossol (Oxisol), which favors dry matter production of Trema micrantha (L. Ulmaceae) seedlings.