The role of science and technology in China's agricultural development has increased significantly over time. The contribution of science and technology to agriculture has risen from 20% in 1949 to a target of 63% by 2020. Agricultural science and technologies in China have advanced in areas like biotechnology, breeding techniques, and hybrid crop varieties, with some reaching world-leading levels. For example, China is a top producer of genetically modified cotton and was an early adopter of transgenic crops. Additionally, China's usage of fertilizers and pesticides, though high, has supported a large rise in grain production over the decades.