沼肥施用对油菜产量、品质和环境效应研究

为研究不同沼肥施用量对油菜产量和品质的影响以及该条件下土壤氮素残留状况，通过在北京大兴区留民营村日光温室田间试验，分别设定不施肥、单施沼渣和沼渣沼液配施等6个处理。研究结果表明：随着施氮量的增加，油菜产量呈现线性-平台反应；当施入的沼肥氮量小于最佳施肥量193 kg/hm2时，每千克沼肥氮能够增加小油菜干重1.87 kg；当施氮量超过193 kg/hm2时，产量随着施氮量的增加不在增加，而呈平台反应。油菜体内硝酸盐含量和沼肥施用后土壤-油菜体系的氮素盈余随施氮量的增加呈线性上升，而Vc含量呈线性递减趋势。随着施氮量的增加，各施肥处理的氮素利用率逐渐降低，而土壤残留无机氮则逐渐增加。

Study on Effect of Biogas Fertilizer on Rape Yield, Quality and Environment

In order to study the effect of biogas fertilizer on the yield, quality of rape and soil environment, a field experiment with 6 treatments was conducted in Greenhouse at Liuminyin Village, Daxing District, Beijing. The biogas residue was used as base fertilizer and the biogas slurry was used as top-dressing in all treatments. The results showed that, the yield of rape had a linear relationship with the applied nitrogen rate when it was lower than 193 kg/hm2 The biogas nitrogen per kilogram could increase the dry weight of 1.87 kg under this condition. But the rape yield didn＇t increase anymore when the N input was higher than 193 kg/hmL The nitrate content increased with the increased N rate, but, by contrast, the Vc content was decreased. Higher soil residue Nmio and lower nitrogen use efficiency were found in the higher N input treatments.