1, different varieties. Songjing 22 (rosin 188) is Wuchang Rice Research Institute of Heilongjiang Academy of Agricultural Sciences; The rice cultivated by Heilongjiang Seed Industry Group Co., Ltd. is a high-quality aromatic rice Wuyoudao No.4 as female parent and intermediate material Song 02-253 as male parent, which has been artificially bred by pedigree method for many years. Songjing 18 is a conventional japonica rice variety bred by Wuchang Rice Research Institute of Heilongjiang Academy of Agricultural Sciences.
2. The maturity date is different. The days from emergence to maturity of Songjing 18 in the adaptation area are 132 days. The days from emergence to maturity of Songjing 22 in the adaptation area are about 144 days.