DESEMPENHO AGRONÔMICO DA CULTURA DO MILHO A PARTIR DO USO DE SEMENTES QUIMICAMENTE TRATADAS COM FUNGICIDAS E INSETICIDAS E SUBMETIDAS A DIFERENTES CONDIÇÕES DE ARMAZENAMENTO

Abstract

RESUMO - A fim de maximizar a eficiencia no processo industrial, armazenar as sementes ja tratadas com fungicidas e inseticidas e de grande importância. Porem, pouco se sabe sobre o resultado desta pratica. Objetivou-se avaliar o efeito do tratamento quimico de sementes de hibridos de milho de diferentes tamanhos, com fungicidas e inseticidas, submetidas a diferentes condicoes de armazenamento, sobre o desempenho da cultura em campo. Sementes dos hibridos 2B647PW, BM915 PRO e SHS4070, de formato chato (CH) e classificadas em dois tamanhos (CH20/64 e CH24/64) foram tratadas com a mistura de Carbendazim + Tiram (Derosal Plus®), Deltametrina (Actellic®), Pirimifos metilico (K-obiol®) e agua [tratamento padrao]. Alem do tratamento padrao foram acrescentados a mistura da calda tratamentos com clotianidina (Poncho®); tiametoxam (Cruizer®) e fipronil (Shelter®). Apos tratadas, as sementes foram submetidas a tres condicoes de armazenamento antes de serem semeadas no verao e quatro condicoes de armazenamento para o plantio de outono. Concluiu-se que os tratamentos quimicos e as diferentes condicoes de armazenamento nao interferem na produtividade dos hibridos de milho 2B647 PW, BM915 PRO e SHS4070, independentemente do tamanho das sementes e da epoca de semeadura. Palavras-chave: Zea Mays, vigor de sementes, conservacao, tratamento sanitario, tratamento industrial. AGRONOMIC PERFORMANCE OF CORN CROP BY THE USE OF CHEMICALLY TREATED AND STORED SEEDS ABSTRACT - In order to maximize the efficiency of the industrial process, storing the seeds already treated with fungicides and insecticides is very important. However, little is known about the outcome of this practice. The objective of this study was to evaluate the effect of the treatment of seeds of corn hybrids of different sizes with fungicides and insecticides and subjected to different storage conditions, on the performance of the crop at field. Seeds of the 2B647PW, BM915 PRO and SHS4070 hybrids were classified in two sizes (CH20 / 64 and CH24 / 64) and were treated with Carbendazim + Tiram (Derosal Plus®), Deltametrin (Actellic® ), Pirimiphos methyl (K-obiol®) and water [standard treatment]. In addition to the standard treatment, treatments with clothianidin (Poncho®) were added to the syrup mixture; thiamethoxam (Cruizer®) and fipronil (Shelter®). After being treated the seeds were subjected to three storage conditions before sowing in the summer and four storage conditions for the autumn planting. As conclusion,,the chemical treatments and different storage conditions did not interfere in the productivity of hybrids of maize 2B647 PW, BM915 PRO and SHS4070, regardless of seed size and sowing time. Keywords: Zea mays, seed vigor, conservation, sanitary treatment, industrial treatment.