Green Cultivation Technology for Saving Cost and Increasing Yield and Increasing Efficiency of Spring Maize：Taking Wind-sand and Grass-flat Area along the Great Wall of Yulin City as an Example

The growth and development regularity of spring maize and the green cultivation techniques of increasing yield and increasing efficiency along the wind and sand grassland area along the Great Wall in Yulin City were comprehensively expounded.Based on the summary of conventional spring maize cultivation techniques，several innovative technologies were put forwarded，included intelligent slow-release fertilizer，one-time chemical weeding and timely harvesting of spring corn，with a view of increasing the production and efficiency of spring corn.