In many Asian countries, particularly India, rice is grown in a way where rice seeds are first sown in one field, and then the seedlings are taken out to be transformed to a water flooded field. I have not witnessed the plantation personally. Why don't they simply sow the seeds and get the full crop without any seedlings transfer? The following videos illustrate what I'm saying: http://www.youtube.com/watch?v=i8a0_yw-mg0&feature=related (watch between 1.07-2.10) http://www.youtube.com/watch?v=ElYKKO82fpo&feature=related In a Wikipedia article on rice I found this: Environmental impacts In many countries where rice is the main cereal crop, rice cultivation is responsible for most of the methane emissions. Rice requires slightly more water to produce than other grains. As sea levels rise, rice will become more inclined to remain flooded for longer periods of time. Longer stays in water cuts the soil off from atmospheric oxygen and causes fermentation of organic matter in the soil. During the wet season, rice cannot hold the carbon in anaerobic conditions. The microbes in the soil convert the carbon into methane which is then released through the respiration of the rice plant or through diffusion of water. The red part seems to suggest that whenever soil is covered with water, fermentation of organic matter starts taking place even when there is no crop, such as rice, involved. What do you say on this? I couldn't understand the blue part. Please help me with it.