大洼县是多年的老稻区，由于稻田土壤有机质含量逐年下降，质地粘重、板结，通透性和保肥供肥能力变劣，营养元素比例失调，使单产再提高难度很大。因此，土壤改良已成为亟待解决的难题。为了探索土壤改良新途径，1998年进行了水田应用土壤调理剂试验，取得了明显的改土与增产 Dawa County is a multi-year old rice area. Due to the declining of organic matter content in paddy soil, the heavy clay texture, the compaction of the texture, the permeability and the ability of fertilizer supply and fertilizer management are deteriorating. The proportion of nutrients is out of balance, which makes it more difficult to further increase yield. Therefore, soil improvement has become an urgent problem to be solved. In order to explore new ways of soil improvement, soil conditioner test was carried out in paddy fields in 1998, and obvious soil improvement and yield increase