Abstract:

Abstract: In order to study the effect of biogas fertilizer on the yield, quality of Chinese cabbage and soil environment a field experiment with 6 treatments were conducted in Beijing area. The results showed that the yield and N uptake of Chinese cabbage had a linear relationship with applied N rate when it lower than 1055 kg N ha-1, as well as the yield don’t increase any more when the N rate higher than 1055 kg N ha-1. while the residue soil Nmin increased with applied N as plateau-linear trends, the Soil Nmin after harvesting increased dramatically when the N rate was more than 1019 kg/ha. The nitrate content of crop increased with higher N rate, but all of them were less than 600 mg/kg.