Nutritional deficiencies in citrus trees: nitrogen, phosphorus and potassium Part 1 of a 4-part series

摘要

At least sixteen elements are conered necessary for the growth of green plants: carbon (C), hydrogen (H), oxygen (O), nitrogen (N), phosphorus (P), potassium (K), calcium (Ca), magnesium (Mg), sulfur (S), iron (Fe), zinc (Zn), manganese (Mn), boron (B), copper (Cu), molybdenum (Mo), and chlorine (C1). We commonly refer to these elements as the plant nutrients and as essential elements. An element is said to be essential if the plant cannot complete its life cycle without it and if the problem that develops in its absence is curable only by that element. Plants obtain O, H, and C from water and carbon dioxide, and the other nutrients from the soil.