First weeding and fertilizing of rice

This is a rice field that has been sown for about 7 days. This is the time to water it to fertilize the first time. You see the yellow field in the distance because it is treated with post-emergence herbicide 3-9 days after sowing, so it has a yellow reaction. However, after watering and fertilizing, about 5 to 7 days later, the rice will turn green again.