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传统的肥料包括有机肥(农家肥)和无机肥(化肥)。许多来到美国亚利桑那州中部的游客都很惊奇:在一些庄稼地旁安装了不少气泵。这是为什么呢?原来,那些气泵中吹出来的是含有高浓度
Traditional fertilizers include organic fertilizers (manure) and inorganic fertilizers (fertilizers). Many visitors to central Arizona in the United States are surprised: a number of gas pumps have been installed near some of the crops. Why is this? It turned out that those pumps are blown out with high concentrations