Wang, Decheng

You, Yong

English

University of Kentucky

University of Kentucky UKnowledge International Grassland Congress Proceedings 21st International Grassland Congress / 8th International Rangeland Congress Design of Leylus‐Chinensis Grassland Root‐Cutter Yong You China Agricultural University, China Decheng Wang China Agricultural University, China Follow this and additional works at: https://uknowledge.uky.edu/igc  Part of the Plant Sciences Commons, and the Soil Science Commons This document is available at https://uknowledge.uky.edu/igc/21/6-1/44 The 21st International Grassland Congress / 8th International Rangeland Congress took place in Hohhot, China from June 29 through July 5, 2008. Proceedings edited by Organizing Committee of 2008 IGC/IRC Conference Published by Guangdong People's Publishing House This Event is brought to you for free and open access by the Plant and Soil Sciences at UKnowledge. It has been accepted for inclusion in International Grassland Congress Proceedings by an authorized administrator of UKnowledge. For more information, please contact UKnowledge@lsv.uky.edu. 瞯 ]766　 瞯 　 Multifunctional Grasslands in a Changing World 　 Volume Ⅰ 　Grasslands/Rangelands Resources and Ecology ——— Reclamation of Grasslands/RangelandsDesign of Leylus‐chinensis grassland root‐cutterYou Yong ,W ang Decheng .China A gricultural University ,＋ 0086 10 62737147 .E‐mail : shirt＠ cau .edu .cnKey words : degenerated glassland ,Leylus‐chinensis ,soil hare layer , root‐cutter ,the curve of bladeIntroduction Eliminating the soil subsurface hard layer and cutting off the transverse roots of Leylus‐chinensis to promote itspropagation and self‐reproduction by a mechanical method is a way to improve degenerated Leylus‐chinensis glassland ( YanZhijian ,２００２) . Shallow ploughing can loosen the soil and promote root system reproduction (Burgess , C .P ,２０００) .In order toserve the above purpose the gap disc harrow is usually used , the rotary cultivator , the no‐wal‐coulter and so on . However ,these tools may cause soil wind erosion or water erosion , and destroy the pasture vegetation . Therefore , designing a new root‐cutter , which can shut off Leylus‐chinensis root with little destruction to vegetation and soil ,is necessary .　 　 Figure 1 Sketch chart o f root‐cutter .Methodology As Figure .１ shows , the root‐cutter designed iscomposed of the blades and the cutter head base which werebuilt in the axletree by symmetrical keyways and drivenrevolving at high speed by lat key transmission load , tocomplete the cutting root process . Every blade is fixed in thecutter head singly , so it is replaced easily if broken ,６ ～ １２blades could be built in the cutter according to the pasturesituation .The cutting edge curve is a section of the concentriccircle , which satisfies the sliding‐cutting performance( Gupta , J . p , Pandey . K . P ,１９９６ ) . The cutter radius ofgyration is ３５０mm , its head base radius is １５０mm ,and the .When used in the experimental plot ,it s` approaching speedwas １ .２ ～ １ .５m/ s , and the rotational speed was ５００r /min .Results and discussions Experimental plots were placed in　 　 Figure 2 cutted Root and slot in soil .selected Leylus‐chinensis degraded grassland in The HebeiGuyuan G rassland Ecosys tem observation research s tation .The root‐cutting rate ( the roots s` proportion which were cutoff ) and the width of slot on the soil surface were increasedwhen the cut root depth changed from １５０mm to ２００mm ,Even if the depth is only then １５０mm , the rate also achievedabove ９０％ , and the width is only between １０ ～ １５mm . Aftercutting work had finished , the pasture plot looked like that infig .２ . Compared with other soil cultivation conditions , thecutter had broken the soil hard layer ,but it did not turnorplow the soil , . It created a slot which is a litter thicker thanthe thickness of the blade . The cutter had cut off most ofroots ,but it did not destroy native vegetation , and there werefewer roots which had been drawn out of the soil .t he use ofthis cutter could protect the soil against wind erosion or watererosion , and improve the soil structure to a certain extent ,but it cannot change soil conditions like a loosening tiller .Conclusions Ddesigned a kind of rotaty root‐cutter which was used to breaking soil hard layer and cutting off Leylus‐chinensisroots to promote its develop , in this way ,the eteriorated grassland could be improved .The cutter could shut off Leylus‐chinensis roots completely ,however make a small destruction to the pasture soil and vegetation .ReferencesBurgess , C .P ,Chapman , R ,Singleton , P .L ,Thom ,E .R ,２０００ .Shallow mechanical loosening of a soil under dairy cattlegrazing : effects on soil and pasture . New Zealand Journal o f A gricultural Research ４３ ,２７９ ～ ２９０ .Gupta ,J .p , Pandey .K .P ,１９９６ .Performance of Rotary Tiller Tynes Under Wet land Condition ,Agricultural Machanization inAsia ,Africa and America １ ,１６ ～ ２ .Yan Zhijian ,Chenmin ,An Yuan ,２００２ . Study on Improving the Degenerated Grassland of Stipa Gradis and Leymus‐ChinensisRegion .Grassland of China ３ ,７ ～ １４ .

Design of Leylus‐Chinensis Grassland Root‐Cutter

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Design of Leylus‐Chinensis Grassland Root‐Cutter

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