一、作物生长发育必需的营养元素大量营养元素:碳(C)、氢(H)、氧(O)、氮(N)、磷(P)、钾(K)、钙(Ca);中量营养元素:镁(Mg)、硫(S)、硅(Si);微量营养元素:铁(Fe)、锌(Zn)、锰(Mn)、铜(Cu)、硼(B)、钼(Mo)、氯(Cl)。二、养分归还学说 First, the crop growth and development of nutrients necessary for a large number of nutrients: carbon (C), hydrogen (H), oxygen (O), nitrogen (N), phosphorus (P), potassium (K), calcium Nutritional elements: magnesium, sulfur and silicon; micronutrients: iron, zinc, manganese, copper, boron, molybdenum ), Chlorine (Cl). Second, the return of nutrients theory