条件筛选
-
Why is it emphasized that paddy fields should be given more organic fertilizer?
When rice paddies are planted year after year, large amounts of the three major elements nitrogen, phosphorus and potassium, and a certain amount of calcium, magnesium, sulfur, iron and other elements, must continually be taken from the soil every year, and small amounts of trace elements such as chlorine, zinc, manganese, boron, copper and molybdenum must also be absorbed. In addition, the silicon absorbed by rice is about 10 times that of chlorine. A large amount of various nutrients...