Abstract:

The effects of 3 rice varieties(Yueyou 938, Zhongyou 208 and Xieyou 205) and transplanting density on salt tolerance, root distribution and yield of rice were studied in Hangzhou Bay coastal saline-alkali land. The results showed that after treatment with 6 g·L^-1 NaCl solution, the salt tolerance index of root of Yueyou 938, Zhongyou 208 and Xieyou 205 was greater than 70%, and the salt tolerance index of bud was greater than 80%. After treatment with 10 g·L^-1 NaCl solution, only the salt tolerance index of root of Xieyou 205 was greater than 60%, while the salt tolerance index of buds was greater than 70%, so Xieyou 205 was identified as a salt-tolerant variety. The root biomass, root length density and rice yield were the highest with the basic seedling number of 450 000 per hm² when the basic seedling number was 150 000, 300 000, 450 000 and 600 000 seedlings per hm². Therefore, Xieyou 205 is a suitable rice variety for planting in Hangzhou Bay coastal saline-alkali land, and the basic number of seedlings suitable for planting is 450 000 per hm².

Key words: rice varieties, transplanting density, salt tolerance, root, coastal saline-alkali land