在沙土上通过沙滤管培养，研究了不同膨润土用量对土壤肥力的影响。
Cultivation experiments with sand filter pipe have been carried out to study the effect of different dosage of bentonite on sandy soil fertility.
应用氯仿熏蒸培养法测定不同肥力水平的土壤生物量-C和-N。
The chloroform fumigation-incubation method was used to measure the biomass-C and-N of soils with different fertility levels.
通过室内培养及室外盆栽实验，研究了砷在粘盘黄褐土、红壤(高肥力、低肥力)、水稻土上的生物学效应。
The present study has investigated biological effects of arsenic on clay pan yellow cinnamon soil, red soils (with high fertility and low fertility) and paddy soil.
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