Consecutive vegetable cultivation in greenhouse easily induces soil acidification or salinization and serious soil-borne diseases, which considerably affects sustainable development of the vegetable production. It is of great urgency to develop some effective techniques and methods to improve degraded vegetable soils. A pot experiment was conducted for comparative study on effects of the application of rice straw (RS), ryegrass (RG) and chicken manure (CM) at different rates (1%, 3% and 7%, of the soil in pot) coupled with or without flooding for 15 days on degraded vegetable soil. Compared to CK_d (no manure and no flooding) and CK_f (flooding only), the practices accelerated decline of soil Eh effectively eliminate accumulated NO3-, lowered the content of SO₄²⁻ and increased soil pH. The effect became more significant with the increasing application rate of organic manure. In the ameliorated soils, except for soils applied with 7% of RS or CM, cucumber was better in growth and yield than in CK_d and CK_f. In terms of soil ameliorating effect, the organic manures show a decreasing order of RG > RS > CM. However, more organic manure does not necessarily improve cucumber in growth or yield.