| In order to investigate the effects of water flooding on root zone soil environment and grain filling of winter wheat at grain filling period, a field experiment with water flooding treatments for 1 day (F1), 3 days (F3), and 5 days (F5) applied at grain filling stage was carried out in Shangqiu, one of the water flooding-prone zones in Huaibei Plain. Results showed that the 100-grain weight of winter wheat at mild-rape stage was decreased by water flooding applied at grain filling stage. The 100-grain weight of F5, F3 and F1 flooding teatments at harvest was lower than that of CK by 6.93%, 10.35%, and 10.31%, respectively. The grain filling rate of wheat was restrained by water flooding. Mean grain filling rate of wheat in F5, F3, F1 and CK was 1.36,1.39,1.52,1.61 mg·d-1, respectively. The milk-rape period was delayed for 5 days by water flooding. Difference in soil temperature between 10 cm and 40 cm soil layer was decreased by water flooding. The longer water flooding, the more decrease in soil temperature of the 10~40 cm soil layer. During the water logging period, diurnal soil temperature in 10 cm soil layer was higher than that in CK. Dry matter and grain yield of winter wheat was decreased by water flooding applied at grain filling stage. Biomass of root and shoot of winter wheat was decreased significantly by water flooding for 5 days. Therefore, water flooding applied at grain filling stage had effects on the root zone environment and above-ground biomass formation, then grain filling and grain yield. |
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