Comparison of moisture loss and its increment during the rehearsal process based on natural drying and water soaking application with or without sealing the trial discs of Common black poplar (Populus nigra L.)
This study was subjected to be set up to prove the pattern of moisture loss and moisture increment within the same wood samples prepared as the discs (30x23±3 cm diameter) with or without the bark intact during drying and in the duration of the water soaking application. In this concept, wood was exemplified by Common black poplar (Populus nigra L.) of the five 12 year old trees that are grown indigenously in the same wooded area. The moisture loss was checked by the natural drying process of 25 days, and the moisture increment was tested by the water soaking application of 25 days. Both natural drying process and water soaking application were carried out in the manner that one after the other based on the interdependent relationship between experimental condition and wood moisture content. The two tests were designed: test 1 was took place at the standard room temperature and relative humidity, and arranged with the experimental wood samples of the control (debarked), the unsealed (debarked before water soaking), the sealed (around the disc was coated with waterproof material before drying), test 1 was conducted at the warmer and cooler places indoor at the air temperature of 23 °C and 18 °C respectively, and the water temperature of water was at 20 degrees Celsius for soaking application. The experimental observations showed that the condition of the experimental area and the situation of the wood samples were more effective for either loosing or gaining moisture. The bark illustrated the ability to regulate evaporation of free water in the wood during natural drying and the stable condition of the experimental places that decreased the sapwater loss per unit of processive time after 15 days. According to the experimental findings, the dried-wood has limited potential for receiving the similar moisture content at once it was dried to below the fibre saturation point. In this case, the ability to recover of naturally dried-wood in the frame of moisture increment at the end of the water soaking application was found to be just over half of the initial moisture level before the natural drying process was started.
Keywords: cutting tree in the summer, common black poplar, moisture loss, moisture increment of wood, natural drying process, water soking