TY - JOUR AU - Portuguez-García, Mary Pamela AU - Rodríguez-Ruiz, Ana María AU - Porras-Martínez, Carolina AU - González-Lutz, María Isabel PY - 2020/09/01 Y2 - 2024/03/28 TI - Imbibition and temperature to rupture latency of Ischaemum rugosum Salisb JF - Agronomía Mesoamericana JA - Agron. Mesoam. VL - 31 IS - 3 SE - Technical Notes DO - 10.15517/am.v31i3.38392 UR - https://revistas.ucr.ac.cr/index.php/agromeso/article/view/38392 SP - 793-802 AB - <p><strong><span class="CharOverride-2">Introduction.&nbsp;</span></strong>The germination of<span class="CharOverride-5">&nbsp;Ischaemum rugosum</span>&nbsp;Salisb. is uneven due to the presence of latency, a process that affects its management and research.<span class="CharOverride-2">&nbsp;<strong>Objective.</strong></span><strong>&nbsp;</strong>To evaluate three methods for breaking dormancy in&nbsp;<span class="CharOverride-5">I. rugosum</span>&nbsp;Salisb. seeds that allow its uniform germination under controlled conditions.&nbsp;<strong><span class="CharOverride-2">Materials and methods.</span>&nbsp;</strong>Three experiments were carried out at the Laboratorio Oficial de Análisis de Calidad de Semillas del Centro para Investigaciones en Granos y Semillas of the Universidad de Costa Rica, San José, Costa Rica; from May to June 2016. In the first experiment, potassium nitrate and distilled water, two imbibition times, and a control without imbibition were tested. In the second, the seeds were subjected for three weeks to four constant temperature regimes (15 °C, 30 °C, alternating temperatures 15 and 30 °C, and ambient temperature of 26 °C). In the third, seeds were placed in water for one hour at different degrees of heat (23, 30, 45, and 65 °C), a control without imbibition was used.&nbsp;<strong><span class="CharOverride-2">Results.</span>&nbsp;</strong>In the first experiment, the best treatments were 16 and 24 h of imbibition with potassium nitrate. In the second experiment temperature was a significant factor, germination was reached with three temperatures used, only with 15 °C there was no germination. In the third experiment the temperature in the water was a significant factor, the highest germination occurred in the treatment at 23 °C, while at 65 °C no germination occurred.&nbsp;<strong><span class="CharOverride-2">Conclusion.&nbsp;</span></strong>The use of hot water as a way to break latency was ruled out. It is concluded that the best treatments were KNO<span class="CharOverride-6">3</span>&nbsp;at 0.25 % for 16 or 24 h, while the use of water was only effective in the time of 16 h, in all three cases alternating temperatures between 15 and 30 ° C.</p> ER -