| Effect of rainfall harvest and water-saving irrigation technology to the photosynthetic characteristics and yield of summer maize |
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| DOI：10.7606/j.issn.1000-7601.2014.01.024 |
| Key Words: rainfall harvest and water-saving irrigation photosynthetic characteristics fluorescence parameters summer maize |
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| Abstract: |
| Taking the furrow irrigation and leveling border irrigation as control, through 2-year field experiment study,has analyzed the effects of rainfall harvest and water-saving irrigation(RHWI) technology in Guanzhong Irrigation district to the photosynthetic parameters, fluorescence paramete
rs, chlorophyll content of summer maize functional leaves. and yield. The experiment results showed that: In the same irrigation treatments, the maximum fluorescence(Fm), variable fluorescence(Fv), maximal PSⅡ efficiency(Fv/Fm), PSⅡ potential activity (Fv/Fo) and the chlorophyll content of RHWI treatments were significantly higher than the furrow irrigation and border irrigation for all determined period. Compared with furrow irrigation, border irrigation and rainfall harvest by furrow dike, the yield of RHWI with irrigated 1 time at pre-sowing stage treatment was increased 4.9%(P<0.05), 8.5%(P<0.05) and 2.2%, respectively; for irrigated 1 time at the flower stage treatment, the yield was increased 6.0%(P<0.05), 8.3% (P<0.05) and 1.3%; and at the treatment of pre-sowing and flowering stage each irrigated 1 time, the yield increased. 7.0%(P<0.05), 11.2%(P<0.05) and 7.2%(P<0.05) while, for the RHWI, the net photosynthetic rate (Pn) and the
instantaneous water use efficiency(WUE) at filling stage total were significantly higher than border irrigation, but there was no significant effect on the minimal fluorescence (Fo) and transpiration rate (Tr). In addition to the treatment of 1 time irrigation at flowering stage, the hundred kernels wight of RHWI treatment under other irrigation treatments were significantly
higher than furrow irrigation and border irrigation. The research also showed that: The RHWI could significantly improve the leaf photosynthetic performance, and enhance electron transfer, the photosynthetic chemical efficiency and potential activity of the PS II reaction center. In addition, the yield of RHWI treatment was significantly higher than the furrow irrigation and border irrigation. These results can be provided a new water-saving technical approach for high production of summer maize cultivation. |
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