Abstract
ABSTRACT: The binder materials used in seed coating provide adherence of the filler materials onto the seeds. Adequate concentrations of the binder promote good physical characteristics of coating while not impairing seed physiological characteristics. Thus, the objective of this study was to evaluate the type and the concentration of binder materials that allow the best physical and physiological characteristics in coated seeds of Campo Grande Stylosanthes. Seed coating was carried out in a coating pan, using sand as the filling material. The treatments consisted of 2 types of binders mixed in 3 ratios (PVA glue and gum arabic glue, diluted in water, 3:1, 2:1, and 1:1), and uncoated seeds as control. The coated seeds were evaluated for physical and physiological characteristics. The laboratory and greenhouse experiments were arranged in a completely randomized design. Results showed that at the different concentrations used this study, neither the PVA glue nor the gum arabic glue had any effect on the physiological quality of Campo Grande Stylosanthes seeds. However, PVA glue in the ratio of 2:1 provided the greatest surface area, maximum diameter, minimum diameter, and sphericity to coated seeds.
Highlights
Cattle has been raised in Brazil mainly in extensive pasture systems
Approximately 60% of these areas with cultivated pasture are in an advanced state of degradation (BARDUCCI et al, 2009)
Before starting the coating process, the seeds were subjected to mechanical scarification using 100-grit sandpaper to break the integumentary dormancy
Summary
Cattle has been raised in Brazil mainly in extensive pasture systems. Approximately 60% of these areas with cultivated pasture are in an advanced state of degradation (BARDUCCI et al, 2009). The main causes of this problem are related to unsuitable management of pastures and animals (LIMA et al, 2011). One of the main factors related to pasture degradation is the inadequate replenishment of nutrients in the soil. The use of fabaceae species in these pasture systems is considered a strategy to minimize these problems (BARCELLOS et al, 2008).
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