植物需要由土壤供应的、较为大量的元素有六种,即钾、钙、镁、氮、磷和硫。后三者是阴离子,都很重要,如果供应不足,就会使植物生长不良,但它们的相对比例,并不很重要。 Plants need to be supplied from the soil, with six more abundant elements, namely potassium, calcium, magnesium, nitrogen, phosphorus and sulfur. The latter three are anions, both of which are important. If the supply is insufficient, the plants will grow poorly, but their relative proportions are not important.