Button mushroom is one of the popular agricultural products and it is cultivated in 70 countries. It has been cultivated more than 50 years in Korea because it is applied many Korean dishes as nutritional foods. The screening criterion for qualities of button mushroom is very strict and difficult for passing evaluation in Korea; therefore, the mushroom growers are burdened with difficulty in production and consumption in price as well. In this study, the contents of crude fat, fiber, ash, and protein were analyzed in three different qualities of button mushroom as normal, immature, and developed button mushrooms. The contents of crude fat, fiber, ash, and protein were 0.21% 8.68% 0.79% and 2.22% normal product, 0.23% 8.95% 0.86% and 2.41% in immature product, and 0.22% 7.79% 0.82% and 2.22% in developed product, respectively. There was no significant difference in basic nutritional values among the products. Therefore, it is expected that will be loosened the screen criterion of button mushroom, and the producers of button mushroom will be more economically benefits for production as well as the mushroom consumers are more economically consumption for button mushroom by reasonable price.

Commonly known as the button mushroom, Agaricus bisporus is one of the most widely cultivated mushroom species of edible fungi. In the breeding of new button mushroom, Seolwon was developed by crossing two homokaryons. Because of the predominantly pseudohomothallic life cycle, only a small percentage of homokaryotic meiospores are produced, which do not fruit. Homokaryotic cultures derived from these types of single spores produce a vegetative mycelium that contain a variable number of genetically identical nuclei per cell. After crossing two homokaryons, hybrids were cultivated on a small scale and on a commercial scale at a farm. The spawn was made by a commercial spawn producer and the spawned compost by a commercial compost producer. Mycelial growth of Seolwon on CDA was better at 25oC when it was compared with that of Seolgang. The mature cap shape of new strain Seolwon is oblate spheroid and the immature cap shape is round to oblate spheroid. The cap diameter was 39.7 mm on average. In comparison with white strain Seolgang, the strain had a yield that was 11% higher. It produced fruiting bodies which had a higher weight on average per fruiting body and were 9.7% firmer with a good shelf life. Days of fruiting body were 1-2 days later than those of Seolgang. The physical characteristics such as springiness, chewiness, adhesiveness, gumminess were better than that of Seolgang.