| 1. | The research results include : 1 a new method of dealing with corn rootstalk is put forward and a new model of no - tillage planter equipped with cutting and digging corn rootstalk mechanism has been developed
为满足生产需要，本文对免耕播种机玉米根茬处理问题进行了深入的理论分析与系统的试验研究，主要研究成果包括： ( 1 )提出了新的切挖处理播种带玉米根茬的思想。 |
| 2. | However , one of the most important limitations to conservation tillage is qualified no - tillage planter . the opener of the no - tiilage planter often ca n ' t break up corn rootstalks and penetrate into the soil so as reducing the performance of the planter
在有玉米茬的未耕地上进行免耕直播时，由于玉米根茬粗，不易破除，要求免耕播种机具有很好的破茬入土能力。 |
| 3. | ? he resistant impact of rootstalks is from 30 . 2j to 60 . 4j . the resistant impact of rootstalks from the areas one crop a year increases 37 % more than that from areas two crop a year ; ( 3 ) the direct shear strength of soil rootstalk composite can be scribed by coulomb equation
玉米根茬的抗冲击能量为30 . 2j 60 . 4j ，在相同试验条件下，一年一熟玉米根茬的抗冲击能量比一年两熟玉米根茬的抗冲击能量增大14 23 ；根茬径向抗冲击的冲击能量比轴向大约23 。 |
| 4. | 2 % 22 % and 29 % respectively less than using other three knives at cutting speed of 500mm / min when the moisture contents of rootstalks was 48 . 2 % . the cutting forces were tested at four different parts of rootstalk that were the middle part along a radius , the tip part along a radius , the middle part along axis and the stalk part along a radius , and the force at the middle along a radius is the largest and increase 32 % 45 % 111 % , respectively more than at the other three parts . the force increase 37 % to cut the rootstalks from the areas one crop a year more than that from two crops a year
试验结果表明，根茬含水率愈高，剪切力愈小，根茬含水率与剪切力近似为二次曲线关系；刀片剪切速度愈快，剪切力愈小；凸曲线、斜线、凹曲线和直线四种不同的刀刃曲线对整株根茬剪切力依此由小到大，凸曲线和斜线剪切时有一定程度的滑切作用，所以剪切力相比较小，当根茬含水率为48 . 2 ，剪切速度500mm min时，与其他三种曲线相比凸曲线型刀刃的剪切力依次分别减少了7 . 2 、 22和29 ；对根茬中部、梢部和根部的剪切力，在相同试验条件下，径向中部最大，比梢部，轴向根部和根部茎秆所需剪切力分别增加32 、 45和111 ；当含水率为48 . 2 ，刀片的剪切速度为500mm min时，一年一熟玉米根茬比一年两熟的玉米根茬剪切力增大37 。 |
| 5. | The coherence force c and the inner friction angle of composite increase 115 % - 205 % and 11 % ~ 15 % respectively more than that of no rootstalk soil . 3 the mechanism of dealing with corn rootstalks and eight kinds of blades for experiment in the soil bin have been developed in order to investigating the performance of dealing with rootstalks
土壤-根茬复合体其抗剪强度与剪切面上的法向压应力成正比，复合体土壤凝聚力c比无根土壤增加115 205 ；内摩擦角增加11 15 。 |
| 6. | 4 a new blade has been developed and its parameters have been studied in detail . 5 a new no - tillage planter 2bmyw - 2 is made and more than 110mu fields in herbei province are planted using it . the production experiments shown that the rate of clearing rootstalks away from seed beds is more than 92 % and disturbed soil is from 20 % to 27 % and the working performance of the sample machine is excellent
( 5 )制作出2bmyw - 2型切挖式玉米免耕播种机一台，在河北丰宁和学校农场进行了110多亩的免耕播种试验，结果表明：该机对播种带的玉米根茬清除率达92以上，种床基本无玉米根茬，破茬能力强、清茬效果较好，动土量少，表土破土量约占20 27 。 |
| 7. | The test results in the no - tillage fields with corn rootstalks shown that the sample machine has a good ability to cut and dig corn rootstalks only in the seed beds so that the new no tillage planter can create a good condition of seed bed and have lower power consume . 2 system experiment is conducted to investigate the mechanical properties of rootstalks and soil rootstalk composite . the experiment results include : ? he maximum cutting force decreased exponentially with increasing cutting speed and the moisture contents of rootstalks
通过对新型免耕播种机的田间生产试验，证明了切挖处理播种带玉米根茬原理可行，所开发的机具结构新颖，具有创新性；该机不但能创造无根茬的良好种床条件，有利于种子生长发芽，而且不需大量粉碎根茬，因而扰土量少、整机消耗动力小、破茬入土能力强，有利于充分发挥保护性耕作的优势。 |
| 8. | In order to solve this problem a new method of dealing with corn rootstalk is put forward and a new model of no - tillage planter equipped with cutting corn rootstalk and residue mechanism has been developed . systematical experiments about the performance of the mechanism and the theory of cutting corn rootstalk and residue have been conducted in this paper , and significant research achievements have been obtained
目前生产中所应用的普通免耕播种机，还没有针对处理玉米根茬所设计的破茬装置，在有玉米根茬的未耕地上直接播种时就存在破茬能力差，将种子播在根茬上，或将玉米根掀出形成大坑等问题，严重影响播种质量。 |
