| To study the effect of regulated deficit irrigation on growth characteristics and quality of the grape under delayed cultivation during different growth stages, using five treatments including: mild water deficit at, germination stage (RDI-Ⅰ), vining stage (RDI-Ⅱ), blossom period (RDI-Ⅲ), fruit enlargement (RDI-IV)and ripening stage (RDI-Ⅴ) and control group with sufficient water supply were set. The results showed that, water deficit had significant effecs on the growth characteristics and quality of the grape during different stages compared with control. Although during the germination and vining stage, mild water deficit had no significant effect on the normal growth of grape plants and photosynthesis. However, under moderate water deficit during germination stage, the yield of delayed cultivation grapes increased 2.87% than CK. Further, during ripening period, grape quality improved considerably under moderate water stress, and it markedly enhanced the grape sugar content (22.29% more than CK), while reduced the total soluble solid contents and titratable acidity (reduced by 7.08% and 3.41% respectively than CK), maintained higher content of anthocyanin glycosides and the overall optimal grape quality. The resn'ts indicate that different water deficit conditions during different growth stages enhanced the grape quality, coloring maturity and growth, and it could be the best way to improve grape quality under mild water deficit during fruit ripening stage. |
