Effects of irrigation and sulphur and their interactions on photosynthetic characteristics and yield of winter wheat.

Effects of different sulphur rate and irrigation time on photosynthetic characteristics and yield of two high-yield winter wheat cultivars with different spike types(LKAZ8 with a big spike and YM49-198 with a multiple spike) were studied under field experiment conditions.The results showed that the yield of the S60 with 60 kg/hm2 was higher than that of S30(30 kg/hm2) and S0(0 kg/hm2),and the differences reached a significant level between them. Compared to control(S0),the yield of LKAZ8 and YM49-198 with S60 increased by 19.32% and 9.24%,respectively.Photosynthetic rate and SPAD value of two cultivars with S60 were higher than that with S30(30 kg/hm2) and S0(0 kg/hm2) at the final.Among irrigation treatments,difference existed between the yield of two cultivars.The highest yield treatment of LKAZ8 was W0(non-irrigation),and YM49-198 was W1(jointing stage irrigation) treatment.