The zonal soils of Hainan province comprises with laterite, savanna soil, mountain lateritic red earth, mountain yellow earth, etc.
海南地处热带，地带性土壤有砖红壤、燥红土和山地赤红壤、山地黄壤等。
2
Lateritic red soil and yellow soil were more evidently acidified than red soil and yellow brown soil.
其中又以赤红壤和黄壤的酸化比红壤和黄棕壤明显。
3
This paper studied the effect amended Lateritic Red soil using graft copolymer of nitro-humic acid with acrylic acid and acrylamide on the adsorption and desorption of potassium ion in soil.