Intervalos entre semeadura e irrigação na emergência de sementes de soja

Abstract

Soybeans originate from Asia and are one of the main commodities grown in Brazil. The production of this crop depends on factors such as vigorous seeds, sowing at periods indicated according to the agroclimatic zoning, and also temperature and humidity conditions for germination and emergence to occur. Abiotic stresses, such as droughts, excessive rainfall, and high temperatures will harm the development of the crop, reducing final productivity. Thus, in this study, the germination of soybean seeds subjected to different periods of water deficit in the soil was evaluated. The experiment was conducted at the Federal Technological University of Paraná, Dois Vizinhos campus, partly in a laboratory and partly in a greenhouse. The design used was completely randomized, with four replicates and five treatments. The response of the seeds to different soil moisture conditions was evaluated. Based on the experiment, it was concluded that soybean seeds remained viable in dry soil up to 15 days after sowing. Hydration on the day of sowing, followed by regular water supply, provides high performance of soybean seeds according to the variables emergence in the field at 28 days, average emergence time, emergence speed index and emergence coefficient.