"又是fertilizer的,恐怕是烧了"
It is impossible. The fertilizer is so called slow release fertilizer. It is coated. It would only controlled release chemical where is water.
"我家草地突然一大片的发黄"
Not a problem, same as my house. If you want it green, water deep, not just hose it down and wet the grass, It needs 1inch of water per week.