Abstract: In this article, we studied the effects of intensively reductive treatment on soil physical, chemical and biological properties in a watermelon continuous cropping obstacle field in Hainan Province. The experiment contained four treatments, i.e. CK (no flooding), flooding, flooding incorporated with plastic film mulching, and flooding incorporated with plastic film mulching and 7500 kg·hm^-2  alfalfa (Medicago sativa L.) (i.e. intensively reductive treatment). The results showed that the percentage of soil large clods (>5 mm) significantly decreased, suggesting that soil structure could be improved effectively by the intensively reductive treatment. The soil Eh value and nitrate concentration decreased rapidly, while the pH value increased obviously during the intensively reductive treatment. After the intensively reductive treatment, fungi and Fusarium oxysporum in soil reduced significantly. Our results indicated that the intensively reductive treatment may be a high efficient and environmentfriendly method to improve the continuous cropping obstacle soil.

Key words: institutional theory, financial performance, environmental performance., eco-innovation