Abstract
The aim of this study was to evaluate the effect of different seed coatings on the physiological potential of perennial soybean cv. Comum. The following treatments were tested: control (no coating); limestone + polyvinyl acetate (PVA); limestone + sand + PVA; limestone + charcoal + PVA; calcium silicate + PVA; calcium silicate + sand + PVA; and calcium silicate + charcoal + PVA. Seeds were evaluated for water content (WC), maximum diameter (MAD), minimum diameter (MID), 1000-seed weight (TSW), germination test, germination speed index (GSI), average germination time (AGT), emergence, emergence speed index (ESI), average emergence time (AET), shoot length (SL), root length (RL), dry and fresh matter of shoots (SDM and SFM), and dry and fresh matter of root (RDM and RFM). Coatings influenced GSI, AGT, emergence, and ESI, but germination was unaffected. The use of silicate with or without charcoal led to the same AET as that observed in the uncoated seeds. Coatings did not affect SFM, SDM, or RFM. Coating with limestone + sand + PVA or limestone + charcoal + PVA led to increases in SL, SFM, SDM, RFM, and RDM.
Highlights
In Brazil, the livestock activity in all regions of the country is founded upon the use of grasslands, mainly native pastures, which is an important feed source for herds
The coating composed of limestone + sand + polyvinyl acetate (PVA) provided the highest the descriptive analysis of 1000-seed weight (TSW) (10.68 g), followed by the treatment with dolomitic limestone + activated charcoal + PVA (8.89 g)
Results obtained for first germination count (FGC) reflected in the germination speed index (GSI) and average germination time (AGT), for which the seeds showed the same response (Table 1)
Summary
In Brazil, the livestock activity in all regions of the country is founded upon the use of grasslands, mainly native pastures, which is an important feed source for herds. Cultivated pastures have occupied an ever-increasing space in the Brazilian scenario [1]. These characteristics make it one of the most used forage legumes in Brazilian pastures [2]
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