Abstract:In order to explore the effects of different irrigation patterns on agronomic traits, photosynthetic traits, water use efficiency (WUE) and radiation use efficiency (RUE), the experiments included control irrigation, wet irrigation and flood irrigation, which were carried out in Qing’an Irrigation Experimental Center in the semi-humid area of Heilongjiang Province from May to September in 2017 and 2018. During the two growing seasons, the results showed that compared with flood irrigation, the LAI under control irrigation was increased by 7.94%~23.67% (2017) and 5%~14.47% (2018), respectively. Compared with flood irrigation, the cumulative of IPAR under control irrigation and wet irrigation was increased by 74.05μmol/（m2·s）, 23.65μmol/（m2·s） (2017) and 63.35μmol/（m2·s）,16.85μmol/（m2·s） (2018), respectively. Meanwhile, compared with flood irrigation, the accumulation of dry matter under control irrigation was also increased by 12.13% (2017) and 7.98% (2018), respectively. During the rest of the milky stage, the SPAD value of the leaves under control irrigation was significantly higher than that under wet irrigation and flood irrigation. On the other hand, Fv/Fm under the three irrigation methods was increased from tillering stage, and decreased at milky stage after Fv/Fm reached the maximum value at jointing stage and heading stage. Values of qN and qP were fluctuated slightly at early three stage, and then decreased rapidly at milky stage. ETR showed a trend of decreasing at the beginning of tillering stage. The yield under control irrigation was slightly higher than that under flood irrigation. However, the irrigation water consumption under control irrigation was decreased by 31.45% (2017) and 31.67% (2018), respectively, and compared with the flood irrigation, the WUE under control irrigation was increased by 46.45% (2017) and 46.20% (2018), respectively. Additionally, compared with the flood irrigation, the RUE under control irrigation was increased by 1.042% (2017) and 1.036% (2018), respectively. It showed that the control irrigation was the best irrigation methods in the semi-humid area of Heilongjiang Province.
