Motjul, also called jangjul, is a reference line that allows people to plant rice seedlings at regular intervals, and transplant rice seedlings that have grown at a rice seedbed to paddies in a line at regular intervals. The string is marked with knots varying in interval, for example, by 12 cm and 15 cm, depending on rice types and paddy conditions. The transplanting is carried out line by line, and highly efficient in that many people can transplant seedlings at the same time by dividing the paddies, and cooperation is required during the process. In addition, the regular intervals of seedling heads and the straight peddling lines enable air to move freely through them, which leads to high crop yields and efficient weeding. This method is generally used in flatlands, since moving the line is inconvenient and inefficient in narrow, terraced paddies in mountain and valley areas.