Author(s): Kuang Wang; Youzhen Wang; Guangmin Tang; Fan Li; Charles Steven Melching
Linked Author(s):
Keywords: Experimental study; Inundation; Paddy; Storm water utilization
Abstract: According to the meteorological, hydrological conditions in the test area and inundation sensitivity of rice in different stages, the test studies on response and adaptation of rice to inundation depth and duration during typical growth periods. To select suitable depth of storm water storage in paddy field, four stages of rice growth period are introduced in inundation test, namely Tillering Stage， Jointing-booting stage，Heading Stage, Grain Filling Stage. The test is designed as a double factors experiment. The effects of different inundation depths and inundation duration on typical rice growth stage are the two main experimental factors. Four ratio of the inundation depth accounted for rice plant height are chosen, that is 1/4, 2/4, 3/4, 4/4, meanwhile inundation lasted for 3 days, 6 days, 9 days are selected. The results showed that inundation ratio of 2/4 and 3/4 in each stage of growth period have little effect on yield reduction, instead, product increased to some degree, especially in tilling stage. Through measuring the photosynthesis of rice during Jointing-booting stage, Heading Stage under the four inundation depths，the photosynthesis was not inhibited obviously with respect to increasing depth and longer duration except for 4/4 inundation ratio, and the rice performed compensation action and adaptive capacity responding to inundation threat. Experiment indicates that inundation obviously leads to yield reduction in Heading Stage and the starting of Grain Filling Stage, whereas yield decreases lightly in Tillering Stage，Jointing-booting stage caused by inundation. In the later two stages, the rice plant height and the time of tasseling and blooming were inhibited respectively, Tillering Stage and jointing-booting stage were delayed．The sensitivity for four rice growth phases are sorted in order as follow：Heading Stage>Jointing-booting stage>Grain Filling Stage>Tillering Stage．With the limit of 10% yield reduction and 6 days inundation ， the up limit water inundation depth in each stage of rice growth is 45cm, 65cm, 60cm, 65cm respectively. According to these, using 0. 2 million hectares rice field along the Huaihe River for collecting heavy rain can not only ease the flood pressure to the downstream river, but also reduce the pumping energy consumption. Therefore, the experiment results give a reference for making use of storm water resources, moreover, it is helpful for drainage system design and operation & maintenance in Huaihe drainage area．
Year: 2013