EMBEBIÇÃO E PROFUNDIDADE DE SEMEADURA DE SEMENTES NÃO REVESTIDAS E REVESTIDAS DE FORRAGEIRAS

Abstract

The aim of this work was to evaluate the seed coating effects during imbibition, emergency and early growth of six forages of Urochloa genus in different sowing depths. The experiment was conducted in the greenhouses and in the Seed Analysis Laboratory at UNOESTE, Presidente Prudente (SP) during 2013. Seeds from the same batch of the cultivars La Libertad (MG4), Xaraés, Marandú and Piatã (Urochloa brizantha), Basilisk (U. decumbens) and Kennedy (Ruziziensis) (U. ruziziensis) were submitted or not to coating with graphite, polymer, fungicides and insecticide were obtained in Presidente Prudente. The imbibition curves; emergency; root, shoot and total dry mass production in different depth (zero; 1.75; 2.5; 5.0 e 7.5 cm) were determined. The coated seed water absorption, root protrusion, emergency and emergency velocity index was slower than no coated seed. Regardless of the seed coat, the Piatã and Ruziziensis cultivars perform well in seeding depth between 2.5 and 3.5 cm; MG4 up to 4.5 cm; Basilisk between 4.0 and 5.0 cm; Marandu and Xaraés are more tolerant sowing depth in the range between 4.0 and 6.0 cm.

Keywords

• embebition
• emergency
• grassplot
• Urochloa
• emergency speed