Abstract:

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 1.8 kg under this condition. But the rape yield didn’t increase anymore when the N input was higher than 193 kg/hm2. The nitrate content increased with the increased N rate, but, by contrast, the Vc content was decreased. Higher soil residue Nmin and lower nitrogen use efficiency were found in the higher N input treatments.