Today, 33 years ago, on December 24, 1992 (Lunar Calendar December 1, 1992), the national labor model Wu Jinchang passed away. On December 24, 1992, the national labor model Wu Jinchang passed away, aged 83. Wu Jinchang was a resident of Shanxi Prefecture. He has long worked to explore the laws of cotton abundance, and has created more than a dozen new methods for cotton cultivation such as "cold bed cultivation" and "double cotton" and "two layers" new cotton, making a major contribution to improving cotton output and solving the problem of cotton rejection.