Design and Experiment of Root-cutting and Subsoiler for Compacted Leymus chinensis Grassland
To improve the mechanized improvement effect of compacted Leymus chinensis grassland,a mechanized improvement process for compacted Leymus chinensis grassland was proposed and a grassland root-cutting and soil loosening compactor was invented.By exploring the physical structure characteristics of the root-soil composite layer of Leymus chinensis grassland and the analysis of the integration of agronomy and agricultural machinery,a technology for the improvement of the root-cutting and soil-loosening of Leymus chinensis grassland was proposed.An oblique-handled root-cutting knife,a folding-wing loosening shovel,and a V-shaped compacting roller specially used for the improvement of compacted grassland were designed.A grassland root-cutting,loosening and compacting machine was integrated and created,and its operating performance was verified through grassland tests.The test results showed that the firmness of grassland soil after loosening operation and root-cutting and loosening operation were decreased by 59.99% and 59.77% respectively,the bulk density was decreased by 23.62% and 22.99% respectively,and the porosity was increased by 20.71% and 20.16% respectively,and the groove gap width,soil uplift height,ridge contour area,soil looseness,tillage rate and surface flatness after root-cutting and loosening operations were all smaller than those after loosening operations.The operating depth stability coefficients of loosening operation and root-cutting and loosening operation were no less than 95.17%,but at the same operating speed,the operating depth stability coefficient of root-cutting and loosening operations was always higher than that of loosening operations,and root-cutting and loosening operations were closer to the expected operating depth(15 cm)than loosening operations.The suppression operation can fill the groove gap generated by the root-cutting and loosening operation appropriately.
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