1, American farmers should carefully observe the fertilizer demand characteristics of varieties when planting. For fertilizer-loving varieties, fully decomposed organic fertilizer should be used as base fertilizer, and more organic fertilizer or inorganic fertilizer should be applied when fertilizing.

2. American farmers choose loose and fertile soil when planting sorghum, but this is not the case in every region, so we should also pay attention to the fertility and properties of soil when fertilizing.

American farmers should fertilize according to the climate change. For example, in early spring, when the temperature is low, it is suitable to use phosphorus and potassium fertilizer as seed fertilizer to promote seed germination and emergence. In the early and middle stages of seedling growth, the climate is gradually warming up, and nitrogen fertilizer should be applied to promote the rapid growth of seedlings.