本文旨在利用已发表过的有关一般养分循环的资料,探讨了肥料中各种主要养分在农业生态系统中总的利用率(Overall efficiency)。Liebig早在1840年就已认识到对植物养分循环的利用。他在《有机化学在农业和生理学中的应用》一书中写道:“如果每年由于收获而从田间移走的养分如数得到补偿,我们就能使农田的肥力保持稳定。仅当养分的加入量超过其移走量时,农田肥力和作物产量才能得到提高”。 The purpose of this paper is to use published data on general nutrient cycling to explore the overall efficiency of various nutrients in fertilizer in agro-ecosystems. As early as 1840, Liebig recognized the use of plant nutrient cycling. In his book, Organic Chemistry in Agriculture and Physiology, he writes: “If the amount of nutrients removed from the field each year due to harvest is compensated for, we will be able to stabilize the fertility of the fields. Only when nutrients The amount of farmland fertility and crop yields can be increased if it is added in excess of its removal. ”