Soybean seed coating with sources and doses of potassium and protecting products

O trabalho teve como objetivo avaliar o desempenho de sementes recobertas de soja com fontes e doses de pot??ssio e produtos protetores. As avalia????es foram feitas em casa de vegeta????o: emerg??ncia aos 15 dias, ??ndice de velocidade de emerg??ncia, n??mero de vagens, n??mero e peso de sementes, ??rea foliar e massa seca. Para o experimento em laborat??rio foram avaliados: germina????o, envelhecimento acelerado, teste de frio, comprimento de pl??ntula, parte a??rea e raiz, em dois per??odos (rec??m colhidas e armazenadas por um ano); e sanidade. Em casa de vegeta????o utilizou-se blocos ao acaso; no laborat??rio delineamento inteiramente casualizado; e na sanidade utilizou-se um experimento fatorial 8 x 2. As m??dias entre os tratamentos foram comparadas pelo teste de Duncan a 5% de probabilidade. Os resultados permitiram concluir que: o recobrimento de sementes de soja com fungicida, inseticida, micronutrientes e pol??mero pode aumentar o rendimento das sementes no campo em at?? 20%; o recobrimento de sementes de soja com fungicida, inseticida e micronutrientes n??o causa redu????o no vigor das sementes; o tratamento e o recobrimento das sementes com pol??mero s??o eficientes na redu????o da incid??ncia dos fungos de armazenamento; o recobrimento de sementes de soja com solu????o de cloreto de pot??ssio pode aumentar a produ????o em at?? 20%; o recobrimento de sementes de soja com solu????o de pot??ssio + pol??mero melhora o desempenho das sementes de soja; e o efeito positivo do recobrimento com pot??ssio ?? influenciado pelo n??vel de fertilidade do solo, da dose e da fonte de pot??ssio.This research had the objective to evaluate soybean seed coating over with potassium source and doses and chemical protectants. Performance and quality evaluations were done in a greenhouse: 15-day emergence value, emergence speed index, number of pods, number and weight of seeds, foliar area and dry weight. Laboratory determinations included: germination, accelerated ageing, cold test, total seedling length and length aerial mass and radicle (two periods, i.e. after harvesting and after one year storage); and the Blotter Test for fungus. The experimental design used for the greenhouse experiment was completely randomized blocks, while for the laboratory a completely randomized design was employed. Comparisons of means between treatments were tested through the Duncan test at a 5% probability value. Results allow the following conclusions: soybean seed coating with fungicide, insecticide, micronutrients and polymer can increase soybean seed yields in even 20%; soybean seed coating with fungicide, insecticide and micronutrients did not affect seed vigor; seed treating and coating with polymer was efficient in reducing fungus incidence; seed coating with Potassium Chlorate can increase soybean seed yield in even 20%; soybean seed coating with potassium solution + polymer increased its performance; the positive effect seed coating with potassium is a function of the level of soil fertility and potassium dosage and source