实践经验证明:连年单一施用化肥,必然造成土壤养分不平衡,致使农作物产量停滞不前,品质下降,因而培肥地力是关系到农业能不能可持续发展的大问题。为了有利于促进农业的发展,根据有关实践经验提出几种培肥地力的方法如下。 Practical experience shows that: Single year application of chemical fertilizers, will inevitably lead to imbalance of soil nutrients, resulting in stagnant crop yields, quality declines, so fertilizing land fertility is related to agriculture can not sustainable development major problem. In order to promote the development of agriculture, several methods of fertilizing fertility according to the relevant practical experience are as follows.