Abstract
The objective of this study was to evaluate the effect of the of common bean seeds coating with different doses of Si, supplied by the carbonized rice hulls, in its physic, physiologic and sanitary attributes, as well determine the amount of this element absorbed in plants. The experiment was conducted in Laboratory of Seed Analysis belonging to the Universidade Federal de Pelotas-Brazil, during the crop season 2014/2015. For this, common bean seeds of cultivar BRS Expedito were treated at doses of 0, 45, 90, 135 and 180 grams of Si 100 kg-1 of seeds, using a completely randomized experimental design with four replicates The use of different doses of carbonized rice hulls in the seed coat does not alter the physical quality and does not negatively affect the physiological quality of the seeds. Crescent doses of carbonized rice hulls up to 101 g of Si 100 kg-1 of seeds increase the seedlings vigor evaluated by the total dry mass and length of shoot at 21 days after seeding, as well as the Si amount in roots. The root dry mass at 21 days after seeding presents growth reduction with the increase of doses until 104 g of Si 100 kg-1 of seeds, although, without compromising the shoot development and the element accumulation. The different Si doses supplied by the carbonized rice hulls do not control pathogens associated to seeds.
Highlights
The adequate management with mineral nutrients supplying, throughout the technique of seeds coating, allied to physic, physiologic, genetic and sanitary quality, propitiate vigorous plants, with adequate and uniform stand
Not show any significant change at the final percentage of seedling emergence (SE) (Table 1). These results reveals the compromising of the ability to rapid emerge with the increase in the doses, without affecting the final establishment of the stand
For the variable RDM21d, the results found were adjusted to a negative quadratic model, where the increase in Si doses had its minimum point at 104 g of Si 100 kg-1 of seeds, not compromising the shoot development (Table 1)
Summary
The adequate management with mineral nutrients supplying, throughout the technique of seeds coating, allied to physic, physiologic, genetic and sanitary quality, propitiate vigorous plants, with adequate and uniform stand. Among the most used materials as Si source, are the ones from agro-industrial residues, such as carbonized rice hulls, a sub product of rice industries (Castellanos et al, 2016) It presents an elevated silica content, arousing interest of many researches to seek better uses for this residue (Mendonça, Tavares, Brunes, Monzónm & Villela, 2013; Tunes et al, 2014; Castellanos et al, 2016; Oliveira et al, 2016; Roma-Almeida et al, 2016). This source can be used in the seeds coating, since it does not harm the germination ability, vigor and sanity of seeds after sowing (Tunes et al, 2014; Oliveira et al, 2016; Rufino et al, 2017)
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