Influência do déficit hídrico e do turno de rega na germinação e no crescimento de plântulas de trigo

Abstract

The objective of this work was to evaluate the behavior of wheat seeds and seedlings submitted to different water stress conditions. An experiment was conducted in a greenhouse with a temperature of ± 25 ° C and a relative humidity of 80%. The wheat seeds were seeded with 3 cm of depth in trays of 12000 cm³ containing a homogeneous mixture of sieve ravine, sand and substrate, in proportions of 2/1/1. The experimental design was a completely randomized design (DIC) in a 5x2 factorial scheme, with five water slides (10, 20, 30, 40 and 50% of soil / sand / substrate mixture moisture) and two irrigation shifts (3 and 6 days), with four replicates per treatment and 50 seeds per replicate, totaling 40 trays. The rate of emergence velocity (IVE), seedling emergence percentage, shoot height and dry matter (DM) of shoots were evaluated. The results were submitted to analysis of variance and then regression analysis at the 5% probability level using the statistical analysis program Sisvar version 5.7. It was observed a decrease in IVE, in the total of emerged seedlings, in the height and dry matter of the aerial part of wheat seedlings as a function of the water availability in the medium in which the seeds were sown.