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颗粒肥料有许多优点,但是在城市设厂制造垃圾颗粒肥料有没有必要,是一个很值得商榷的问题。笔者认为谈这个问题,不能离开经济核算的观点。垃圾虽含有植物养料,可以做为肥料,但它的营养价值究竞有限,正如各地的经验所证明,仅仅加入过磷酸钙做成的颗粒肥料,仍不能保证产量,可见各地现在生产的颗粒肥料所表现的增产效果,主要是靠
Granular fertilizers have many advantages, but whether it is necessary to set up factories to produce garbage granules in the cities is a very questionable one. I think that this issue can not leave the economic accounting point of view. Although the garbage contains plant nutrients, it can be used as fertilizer, but its nutritional value is limited. As the experience of various places has proved, only the addition of superphosphate made of granular fertilizers still can not guarantee the output. Now it can be seen that the granular fertilizers The performance of the performance increase, mainly by