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

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.

本研究旨在评估不同包衣处理对柱花草（Stylosanthes）Campo Grande品种种子生理潜力的影响。试验设置如下处理：未包衣种子；石灰石+聚乙烯醇（PVA）胶；石灰石+沙子+PVA胶；石灰石+活性炭+PVA胶；硅酸钙+PVA胶；硅酸钙+沙子+PVA胶；硅酸钙+活性炭+PVA胶。后续对种子开展了以下指标测定：含水量（WC）、最大直径（MAD）、最小直径（MID）、千粒重（TSW）、发芽试验、发芽速率指数（GSI）、平均发芽时间（MGT）、出苗率、出苗速率指数（ESI）、平均出苗时间（MET）、苗与根长，以及苗和根的鲜重与干重。研究结果显示，包衣处理可提升千粒重（TSW）、最大直径（MAD）与最小直径（MID），并降低种子含水量（WC）。其中采用石灰石+PVA胶、石灰石+沙子+PVA胶的处理会延长发芽时间，但所有处理均未对种子生理品质产生负面影响。在柱花草Campo Grande品种种子包衣试验中，硅酸钙+PVA胶处理的发芽速率指数（GSI）以及苗和根的鲜干重表现最为突出。