石灰板结田是水稻土的一种劣向发育的土壤类型,它与发育良好的水稻土(APWGC型)有明显不同的层次结构:APB_(Ca)GC或AB_(Ca)WGC,即某些水稻土原有的P层或W层被石灰板结层B_(Ca)所取代。石灰板结田中石灰质的淀积,一般均造成土壤碱化,土体板结,理化性质不良而影响农作物的生长,甚至是某些地方造成低产的重要原因(如英德县明迳、石灰铺等区)。本文就石灰板结层中的主要新生体——砂 The lime-paddy field is a poorly-developed soil type of paddy soil. It has a distinct hierarchical structure with well-developed paddy soil (APWGC type): APB_ (Ca) GC or AB_ (Ca) WGC, The original P layer or W layer of soil is replaced by B_ (Ca). The deposition of calcareous limestone in the field of limestone generally causes soil alkalization, soil compaction, poor physical and chemical properties that affect the growth of crops, and even important causes of low yield in some places (eg, Yingde County, ). In this paper, the lime layer in the main knot neonatal body - sand