枯草芽孢杆菌和空心菜对鳝虾稻共作池塘水质的影响

在黄鳝-克氏原螯虾-水稻共作塘中,进行了枯草芽孢杆菌和空心菜改善水质的对比实验。结果表明:枯草芽孢杆菌和空心菜对鳝虾稻共作水体均有较好的净化作用,能提升溶解氧、降低p H。其中,枯草芽孢杆菌处理对氨氮、亚硝酸氮、总氮、总磷的去除效果强于3种密度的空心菜,最高去除率分别达到68.06%、86.49%、49.96%和58.82%;单一投放空心菜时,以20%的密度处理对氨氮、亚硝酸氮、总氮、总磷的去除作用最强,最高去除率分别达到63.00%、88.39%、53.12%和49.02%。综上,鳝虾稻共作池塘搭配枯草芽孢杆菌和20%密度的空心菜为宜。

The effects of Bacillus subtilis and Ipomoea aquatica Forsk on water quality in the pond for co-farming of rice-crayfish-finless eel

The contrast experiment was carried out about the effects of Bacillus subtilis and spinach(Ipomoea aquatica Forsk) on the water quality improvement in the pond during the co-farming of rice-crayfish-finless eel. The results showed that Bacillus subtilis and spinach both improved water quality, increased DO and decreased pH of water.Bacillus subtilis had better effects in the decreasing of the NH₄⁺-N, NO₂^--N, TN, TP than spinach of three density groups with the highest level of degradation rate by 68.06%, 86.49%, 49.96%, and 58.82% respectively. Generally, the spinach with 20% of density degraded the level of NH₄⁺-N, NO₂^--N, TN, TP by 63.00%, 88.39%, 53.12 and 49.02% most efficiently. In sum, the combination of Bacillus subtilis and spinach with the 20% density in the pond during the co-farming of the rice-crayfish-finless eel was better.