The test results show the following order of soil types as regard to the soluble fluorine contents from high to low: Shajiang dark soil, Yellow brown earth and Purple soil, Paddy soil, Limy soil.
主要土壤类型土壤水溶性氟含量顺序是砂姜黑土、潮土>黄棕壤、紫色土>水稻土>石灰土、粗骨土。
2
In a laboratory incubation experiment, timing change in amount of humic acid(HA) and fulvic acid(FA) was studied in dark-brownsoil and paddy soil during corn stalk decomposition.