In 1970s and 1990s, because the first frost appeared late and the last frost ended early made the growth season in the eastern part of Brahmaputra basin prolong, especially in 1990s.

• 20世纪70、90年代终霜日提早结束、初霜日推迟来临，使得流域东段生长季延长，以90年代最为明显；