摘要
通过对黄大泥和黄泥田土壤磷素状况及电化学特性等的比较表明:黄大泥由于粘粒,氧化铁、锰及游离碳酸盐含量高,有机质含量低。土壤固相具有比表面大,组成复杂以及无机表面活性很强的特点。因此,土壤对磷酸盐的吸持容量大,而释放率低;淹水后土壤还原过程发展缓慢,pH很难下降到中性,严重影响养分的有效性。通过大幅度地增加土壤有机质含量以降低土壤无机表面活性是改良这类低产田的关键。
soil surface chemical properties of Huangdani (clayey infertile calcareous paddy soil) were studied by comparing the status of soil phosphate and electrochemical properties of Huangdani with those of Huangni (clayey infertile acidic paddy soil) . The results are as follows.
The solid composition of Huangdani characterized by high contents of clay particles,Fe,Mn oxides and calcium carbonate but low OM contents.These lead to the great specific areas and comlex composition of the soil inorganic active surface,to the high capacity of phosphate retention. After submerging the soil pH keeps relative high. This affects the availability of soil nutrients greatly. To ameliorate this type of soil it is an effective measure to decrease the activity of soil inorganic surface by increasing the soil OM contents by a wide margin.
出处
《贵州农业科学》
CAS
1991年第1期13-18,共6页
Guizhou Agricultural Sciences
关键词
水稻土
土壤表面
化学性状
low productive soil
paddy soil
soil chemistry
soil phosphate
