2) With a RN of 75%:25%, the value of proportion of high and middle grad tobacco, content of nicotin, N, K, uptake of N and K/Cl were the highest, volatile base was lowest.

• 2)RN为75%25:25%25时，中上等烟比例、烟碱、总氮、钾、钾氯比、氮吸收量最高，挥发碱含量最低。