Besides the removal ratios of nitrate and nitrite in column a were higher than column B.
另外柱a对硝酸盐氮和亚硝酸盐氮的去除效果也优于柱b。
2
B reaction, inorganic nitrogen sources utilization and citrate utilization, the results were positive. Nitrate reduction experiment presented positive largely.
反应、无机N源利用、柠檬酸盐利用呈阳性，硝酸盐还原试验大多呈阳性；
3
The nitrogen holding capacity of SAP-B is similar to that of SAP-C after 8 rounds watering for urea, but it is moderate for ammonium nitrate.