Characteristics On Canopy Vertical Structures And Agronomic Regulation Of Super-high Yield Of Spring Maize

The characteristics on canopy vertical structures and agronomic regulation of super-high yield of spring maize were studied on the condition of different yield level, film mulching and regulated deficit irrigation with three spring maize varieties (LiangYu 58, NeiDan 314, JingDan 28). The results were as follows.The three spring maizes all have reached a ton per mu. The characteristics on canopy structures of super-high yield of spring maize was lower values of the angle between leaf and stem, higher leaf orientation values in the leaves and compact plant-type. It improved the light condition of the middle leaf and top leaf and made the canopy structures reasonable. It also had the suitable light distribution in every canopy, and intercepted more photosynthesis effective radiation, and reduced the light of top layers, and raised the energy of light use factor, and improved each relevant leaf blade's photosynthesis speed.The treatment of film mulching on the furrows prolonged the functional period of leaves and increased LAI, LAD, photosynthesis rate and the content of chlorophy of super-high yield. The light distribution in super-high yield colony was more uniform and reasonable. Then more IPAR was intercepted by canopy of super-high yield. This avoided the aging of bottom leaf and raised photosynthetic ability. The functional period of leaves, LAI, LAD, the photosynthesis rate, IPAR and ittance raise of every layer in canopy vertical structure of super-high yield colony in spring maize in different film mulching treatments were in sequence of covering film between furrows>covering film on furrows>bare land, which regularity accord with the effect of every treatment on yield.The treatment of regulated deficit irrigation in big mouth stage improved remarkably the maize Grain number per sprike, Grain weight and Harvest index. It contributed to the reasonable light distribution and suitable leaf blade posture and the transmittance and made plant canopy intercepted more IPAR. It also increased leaves blade photosynthesis speed, reduced the transpiration speed. And this reduced photosynthetic product consumption of the before stage, and the photosynthesis production accumulated for later. Irrigation at later period had compensation to the plant of synthesizing and transporting more photosynthesis product. Under the treatment of covering film on the furrows and regulated deficit irrigation in the big mouth time the community accumulated the biggest dry material. The source-sink was bigger and more harmonious. The different layers of identical organ effected also differently to the yield, the leaf was in sequence of Top leaf〉Middle leaf〉Bottom leaf, the cane was in sequence of cane on spike〉cane under spike.