施用生物有机肥（BOF）对连作土壤番茄青枯病发生率和土壤微生物群落的影响结果表明，在对照番茄青枯病发生率为100%的情况下，施用腐熟BOF对番茄青枯病的防治效果为55%。施用新鲜BOF对番茄青枯病的防治效果为50%。FAME 法分析发现土壤微生物群落对生物有机肥的施用敏感，施用BOF 能提高土壤微生物总FAME含量、真菌数量、真菌/细菌比值，使奇数脂肪酸组成比例发生明显变化，aC15∶0、iC17∶0下降，而cyC17∶0上升。施用BOF使土壤防病能力和健康水平提高。腐熟BOF处理后土壤微生物群落中C16∶111c含量明显增加，表明施用腐熟BOF促进土壤中AM菌根的生长。FAME生物标记物可作为土壤健康和抑病性的指标，其中奇数脂肪酸组成比例能灵敏地反映新鲜和腐熟BOF对土壤健康的调控效果。

Three types of paddy soils, derived from granite, Quaternary red clay and basalt, respectively, were selected to study the effects of Fe and Mn in paddy soils on methane production and emission through pot and incubation experiments. The results indicated that the difference of Fe and Mn in paddy soils was one of the important factors causing obvious differences in methane emission from different soil types. Soil Fe and Mn affecting methane emission from the paddy soils was likely through affecting soil Eh and forming Fe and Mn plaques on rice roots. Different rates and valences of added Fe and Mn significantly affected methane production from paddy soils. Therefore, this study enhanced understanding of processes controlling methane emission from paddy soils and may help to improve modeling and estimating regional and global methane emission from paddy soils.

An experiment was conducted to examine the role of Mn in P fixation through comparing with Al and Fe. Hydroxides and oxides of Al, Fe and Mn were prepared in lab under opened and closed conditions to react with phosphate. The newly formed Mn hydroxide showed the strongest P-fixing ability, even several times higher than Fe hydroxide, but became the lowest rapidly due to ageing when exposed to air. Mn oxide showed the lowest P-fixing ability. Therefore, a sound consideration on P fixation should be based on both quantities and P-fixing abilities of the compounds of Fe, Al and Mn. The importance of Mn on P availability should receive more attention especially under oxidation-reduction dynamic conditions.