"If it is possible, Prince, while searching for coal, you could also look for a kind of self-igniting material and another kind of substance," Lin Ziyin considered, "However, the quantities of those materials needed are not much."
"What are they? You just need to list them out." Chu Suifeng ordered with a serious expression.
"I will write them out for you later." The last thing that Lin Ziyin thought of was potassium. The black soil was fertile enough, and the use of organic fertilizers could promote crop growth, but if a small amount of potassium and phosphate fertilizers were added, even if it's just a little, it would undoubtedly be hugely beneficial to crops.
However, she didn't harbor high hopes. After all, potassium and phosphorus are not easily found, and the impact of using them or not did not seem to be too significant.