Vigor e produção de sementes de crambe tratadas com fungicida, inseticida e polímero

Abstract

ResumoO objetivo do trabalho foi determinar a eficiência do tratamento químico de sementes de crambe com fungicida, inseticida e polímero na qualidade fisiológica e na produção de sementes. Sementes de crambe, cultivar FMS brilhante, foram submetidas aos seguintes tratamentos: T1 = Testemunha; T2 = Fungicida (F); T3 = Inseticida (I); T4 = Polímero (P); T5 = F + I; T6 = F + I + P; T7 = F + P, e T8 = I + P. O fungicida utilizado foi o Derosal 500 SC (i.a. Carbendazim), na dose de 3,0 ml kg -1 de sementes, e inseticida Cruiser 350 FS (i.a. Tiametoxam), na dose de 1,0 mL kg -1 de sementes. O polímero utilizado foi o Laborsan (resina sólida), na dose de 0,6 mL kg -1 de sementes. Após o tratamento, as sementes foram avaliadas em laboratório pelos testes de germinação, comprimento da raiz e parte aérea e massa seca de plântulas. Em solo, determinaram-se a emergência, o comprimento da raiz e da parte aérea e a massa seca de plântulas. Em vasos, foram avaliados a altura das plantas, o número de racemos por planta, o número de frutos por planta, o número de frutos por racemos e a produção de sementes. O tratamento de sementes de crambe com fungicida e/ou inseticida, associado a polímero, afetou o vigor em testes de laboratório e, em condições de solo, não afeta a germinação, a emergência de plântulas e a produção de sementes de crambe.Palavras-chave adicionais: polimerização; qualidade; revestimento. AbstractThe objective of this study was to evaluate the effects of treating crambe cultivar 'FMS brilhante' seeds with a fungicide, an insecticide, and a polymer on their physiological potential and productivity. The treatments were the following : T1 = control, T2 = Fungicide (F), T3 = Insecticide (I), T4 = Polymer (P), T5 = F + I, T6 = F + I + P, T7 = F + P, and T8 = I + P. The fungicide used was Derosal 500 SC (a.i. carbedazim) at the dose of 3.0 mL kg -1 of seeds and the insecticide was Cruiser 350 FS (a.i. Tiametoxam) at the dose of 1.0 mL kg -1 of seeds. Laborsan (solid resin) was the polymer used at the dose of 0.6 mL kg -1 of seeds. After the treatments the seeds were evaluated in the laboratory as to germination, seedling root and aerial part length, and the seedling dry weight. In vases, seedling height, the number of racemes per plant, number of fruits per plant, number of fruits per racemes, and seed production were evaluated. Seed treatment with fungicide and/or insecticide in association with a polymer affected seed vigor as evaluated in laboratory and, in the soil, had no effect on seed germination, seedling emergence and seed production.

Polymer coating in soybean seed treatment and their relation to leaching of chemicals

“…The control presented higher values when compared to the other treatments. These results corroborate Ludwig et al (2014) who suggests that these results are due to phytotoxic effect of the higher concentration of the chemical on the germitest paper during the initial growth of the seedling.…”

Rice Seed Treatment and Recoating With Polymers: Physiological Quality and Retention of Chemical Products

“…In this case, it is possible that the chemical treatment caused a phytotoxic effect on the initial seedling growth, as mentioned by Ludwig et al (2014) in sowing of cambre seeds, using the substrate filter paper, in which the coating of chemically treated seeds with polymers, potentiated the action of the insecticide and fungicide causing damage to germination under laboratory conditions. Averages not followed by the same letter in the column, differ by the Scott-Knott test at the 5% probability level.…”

Coating with fungicide and different doses of fertilizer in vinhatico seeds

“…It is worth highlighting that uncoated seeds from the control treatment presented 17.5% of seedlings infested with fungi ( Figure 2C). Ludwig et al (2014), studying the strength and production of crambe seeds treated with fungicide, insecticide and polymer, concluded that the application of fungicide and/or insecticide associated or not to the polymer, affected the strength of the seed in laboratory tests, but in soil conditions, it did not affect germination and emergence of crambe seedlings. Table 2.…”

“…Under greenhouse conditions, the negative effect of fertilizer on the coating is significantly reduced, probably due to the dilution of the coating compounds by the irrigation during the period of this experiment and also because of the adsorption and leaching of part of the compounds. An option to minimize the problems could be the reduction of fertilizer doses as well as the amount of inert material that is used on the coating (Ludwig et al, 2014).…”