基金Supported by the Fundamental Research Fund of Chongqing Public Welfare Research Institutes"On the Yield and Photosynthetic Performance under Different Plant-Row Spacing"(cstc-2014jbky-00510)National Maize Industry Technology System(CARS-02-74)Key Innovation Project of Main Crop Varieties during"the 12thFive-Year Plan""On High Yield and High Efficiency Cultivation Techniques for Maize and the Integration and Demonstration"(cstc2012ggC80007)~~