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In this paper, a new hybrid maize varieties are red 311 as test material, respectively, in the low altitude areas Ya'an (600m) and high-altitude areas Xichang (1590m), studied the early jointing and small bell foliar application of different concentrations of corn Roborant and Uniconazole are red 311 for hybrid maize plant height and ear height, dry matter accumulation, yield components, and to explore the yield and plant height, ear height, dry matter accumulation, yield components between relationship, the results showed that: 1. jointing and small bell early foliar concentrations of corn Roborant and Uniconazole on hybrid maize Zhenghong 311 plant height and ear height were certain reduction effect size decline Not only due to type of chemicals, application time and concentration dependent, but also because planting locations and different. On the whole high-lowering effect, the greater the role of corn Roborant Uniconazole, small bell early jointing stage of spraying than spraying, high concentrations of low-concentration chemical treatments than pharmaceutical treatment, low-altitude high-altitude Ya'an point greater than Xichang point. (2) the early jointing spraying corn Roborant and Uniconazole due to inhibition of leaf growth, reduce plant height and ear height which lead to different degrees cuts, production rate increases with the applied concentration increased. Ya'an point where production is mainly due to lower grain weight, Xichang point cut was mainly due to lower rows per ear. Xichang little bell of spraying corn Roborant also caused cuts, while Ya'an little bell of spraying corn Roborant due to reduced plant height, lodging avoid or reduce the occurrence and behave in a certain yield. 3 two pilot early jointing stage and the small bell spraying corn Roborant and Uniconazole were improved SLA, LAR and LAI trend, but have lower LWR and dry matter accumulation trend, indicating that unreasonable Effects of Corn Roborant and Uniconazole will reduce corn leaf photosynthetic capacity, which is the impact of the physiological basis of corn production. 4 Test results showed that corn Roborant and Uniconazole Zhenghong 311 height and yield results with certain environmental effects, and its proper application techniques to local conditions. Because of the low altitude of Ya'an higher plants, in a small bell Foliar Application 1.5mg / l of corn Roborant to reduce the height to prevent lodging; Xichang due to high altitude strong ultraviolet light enough, the plants are relatively low under normal conditions may apply corn Roborant and Uniconazole, but for the growing threat of excessive presence lodging plots also available in small bell Foliar Application 1.5mg / l of corn Roborant. 5 Because of the ecological environment is different yield components are red 311 different characteristics. Low altitude and high altitude Xichang Ya'an compared rows per ear more, but grain weight is low, fewer kernels per row, the main direction of cultivation is to promote grain filling, increase grain weight and kernels per row; while high-altitude Xichang Cultivation area is the main direction of rows per ear and kernels per row.
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