Physiological potential of stylosanthes cv. Campo Grande seeds coated with different materials

Abstract

-The aim of this study was to assess the effect of different coatings on the physiological potential of stylosanthes cv. Campo Grande seeds. The treatments were: uncoated seeds; limestone + PVA glue; limestone + sand + PVA glue; limestone + activated carbon + PVA glue; calcium silicate + PVA glue; calcium silicate + sand + PVA glue; calcium silicate + activated carbon + PVA glue. Posteriorly, the seeds were analyzed for water content (WC), maximum diameter (MAD) and minimum diameter (MID), thousand seed weight (TSW), germination test, germination speed index (GSI), mean germination time (MGT), emergence, emergence speed index (ESI), mean emergence time (MET), shoot and root length, fresh and dry matter of shoot and root. The coating increased the TSW, MAD and MID and decreased its WC. The treatments comprising limestone + PVA glue and limestone + sand + PVA glue increased the germination time, but none of the treatments negatively affected the physiological seed quality. Treatment with calcium silicate + PVA glue was outstanding for germination speed index and fresh and dry matter of shoot and root in the stylosanthes cv. Campo Grande seeds coating.

Physiological Potential of Seeds of Perennial Soybean cv. Comum Coated with Different Materials

“…Lower WC values in coated seeds were also detected by [11] [21] [22]. [21] stated that the water present in the coating is lost faster than that found in the seed itself; for this reason, coated seeds usually have lower WC values than uncoated seeds.…”

“…Likewise, [19] observed increases of up to 100% in the TSW of Persea indica as they increased the doses of NPK fertilizer added to the filler with sand and limestone. According to [11], the texture of limestone and sand favor the formation of a structure with more granules around the seed, which consequently increases its mass. As a result, the combination of these materials promoted the highest TSW values.…”

“…The following filler-to-seed ratios were employed according to [11]: limestone-3:1 (w/w), calcium silicate-3:1 (w/w), sand-1:1 (w/w), and activated charcoal-0.08:1 (w/w). The amounts of limestone, calcium silicate, and sand were divided into 12.5-g portions, whereas the charcoal was divided into 2-g portions so that the filler could be applied in layers.…”

“…The machine was regulated to operate at a rotation speed of 90 rpm, spraying duration of 1 s, blower temperature of 40˚C, and blowing time of 1 min. The seed-coating procedure (per layer) was performed following the methodology of [11].…”

Perennial soybean seeds coated with high doses of boron and zinc

“…To coat seeds, the methodology used by Xavier et al (2015) was adapted in a N10 Newpack coater, regulated so the chamber would spin at the speed of 90 rpm and the compressed air that activates the solution would be under 4 bar pressure during 1 s. Then, the hot-air blower was switched on at the temperature of 40ºC for 2 min.…”