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一、复合肥料及其类型 复合肥料系指化肥商品中含有两种或三种主要营养元素(N、P、K)的肥料总称。如含氮磷或氮钾的称二元复合肥料,含氮磷钾的称三元复合肥料。此外,在复合肥料中添加一种或多种中、微量元素的则称为多元复合肥料。复合肥料的品位一般以所含N—P_2O_5—K_2O％的总量表示,通常又有低浓度、中浓度和高浓度复合肥料之别。一般N、P_2O_5和K_2O总含量小于30％的为低浓度复肥;30—40％的为中浓度复肥;大于40％的则为高浓度复肥。复合肥料由于制造工艺或加工方式不同,可分为以下三种类型: 1.化成复合肥料(简称复肥)这类复合肥料的特点是在工厂中按照一定的工艺条件用化学合成的方法制得的。由于生产流程中的化学反应和化合物的化学组成的不同,因而具有固定的养分含量和比例,无副成分,一般二元复合肥料即属此类。如磷酸铵
I. Compound fertilizers and their types Compound fertilizers refer to the general term for fertilizers that contain two or three major nutrients (N, P, K) in chemical fertilizers. Such as nitrogenous phosphorus or nitrogen and potassium called binary compound fertilizer, nitrogen and phosphorus-potassium ternary compound fertilizer. In addition, the compound fertilizer to add one or more of the trace elements are called multi-compound fertilizer. The quality of compound fertilizers is generally expressed in terms of the total amount of N-P_2O_5-K_2O contained, and usually there is a difference between low-concentration, medium-concentration and high-concentration compound fertilizers. General N, P_2O_5 and K_2O total content of less than 30% for the low concentration of compound fertilizer; 30-40% for the concentration of compound fertilizer; more than 40% of the high concentration of compound fertilizer. Compound fertilizer due to different manufacturing processes or processing methods can be divided into the following three types: 1. Chemical compound fertilizer (hereinafter referred to as compound fertilizer) This type of compound fertilizer is characterized by the factory in accordance with the conditions of a certain chemical synthesis method of. As the chemical reaction in the production process and the chemical composition of different compounds, which have a fixed nutrient content and proportion, no secondary components, the general binary compound that is the case. Such as ammonium phosphate