Soybean Seed Cover With Solid Phosphate Fertilizer / Revestimento De Sementes De Soja Com Fertilizante Fosfatado Sólido

Abstract

The use of seeders that only deposit seeds in the soil results in the phosphate fertilization to be realized at the surface of the soil, demanding new techniques to the localized phosphate fertilization as the seed covering with solid phosphate fertilizers. The aim of this work was to evaluate the seed cover with supertriple phosphate in granulometries and fertilizer doses. The experiment was a 4x4 factorial (granulometries x doses), which tested the 6, 12, 24 and 48% of fertilizer added in the seed covering, relative to the seeds mass. The fertilizers granulometries were defined by sieves Mesh-Tyler 35, 60, 115 and 270. Seed of soybean variety TMG 7063 were covered using Likoseed polymer (1 ml kg -1 ). It was evaluated the visual quality of seeds cover, the seeds germination on paper roll, the emergence in sandbox and the growth of aerial part and radicle of the seedlings. The finer granulometries combined with the higher doses showed better visual quality of covering however, as the fertilizer doses were higher, the seeds germination, the emergence and the radicle growth were lower. The seed covering is technically viable to supply the fertilizer trough seeds.