土壤养分是土壤肥力的主要因素之一,是作物生长发育的必要条件。一般作物生长需要数量最多的元素是:碳、氢、氧、氮、磷、钾、钙、镁、硫、铁、硅等。另外也需要一定微量元素,如硼、锰、铜、锌、钼等。碳、氢、氧三种元素,主要是通过大气和降水供应,作物可以自由的吸取,不需要人们补给。其他元素都是由土壤供给 Soil nutrient is one of the main factors of soil fertility and is a necessary condition for crop growth and development. The most abundant elements needed for crop growth are carbon, hydrogen, oxygen, nitrogen, phosphorus, potassium, calcium, magnesium, sulfur, iron and silicon. In addition also need certain trace elements, such as boron, manganese, copper, zinc, molybdenum and so on. Carbon, hydrogen, oxygen three elements, mainly through the atmosphere and precipitation supply, crops can be freely absorbed, do not need people to recharge. The other elements are supplied by the soil