Abstract
ABSTRACT Water stress compromises plant growth. Resistance inducers, such as potassium silicate (K2SiO3), can reduce negative effects of this stress on Solanaceae, Capsicum annuum. Plant height, stem diameter and leaf area may indicate the efficiency of potassium silicate foliarsprayagainst water stress. The aim of this study was to evaluate the growth of sweet pepper plants under water stress and K2SiO3 doses. The experiment was conducted in randomized blocks in a split-plot scheme in space. The treatments consisted of four soil water stresses: 15 kPa (field capacity), 25 (intermediate value), 35 and 45 kPa (water stress) and three doses of potassium silicate (0, 0.4 and 0.8 L 100 L-1 water), acting as resistance inducers to water stress. The resistance inducer maintained greater heights of the sweet pepper plants, under water stress (35 and 45 kPa) at the initial stage [(20 days after transplanting (DAT)]. Smaller plant diameters were observed at 80 and 100 DAT at 35 and 45 kPa. Sprays using K2SiO3 maintained sweet pepper leaf area with higher values, even under stress condition. The soil water tension from 35 kPa limited, in general, the plant growth. Growth responses in Capsicum annuum to K2SiO3, via foliar spraying, varied according to plant age, as well as the growth parameter considered in this experiment.
Highlights
Crescimento de plantas de pimentão submetidas a tensões de água no solo e doses de silicato de potássio
A altura das plantas, diâmetro do caule e área foliar podem servir como indicadores da eficiência de pulverizações foliares com K2SiO3 contra o estresse hídrico
Sweet pepper (Capsicum annuum) has carotenoids in its composition which act as antioxidants in prevention and relief of various diseases (AgostiniCosta et al, 2017)
Summary
Crescimento de plantas de pimentão submetidas a tensões de água no solo e doses de silicato de potássio. Menores diâmetros foram observados aos 80 e 100 DAT com 35 e 45 kPa. Pulverizações com K2SiO3 mantiveram a área foliar das plantas de pimentão com maiores valores, mesmo sob condição de estresse. Water has been suffering a tendency of scarcity around the world, which evidences the search for better management practices of this resource through the adoption of techniques to reduce its spending (Egea et al, 2017). This is especially important due to uncertainties in weather events, an increase in environmental, populational and industrial needs (Jonge et al, 2015).
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