谷子机械播种技术推广与实践

来源 :河北农机 | 被引量 : 0次 | 上传用户:greenhight
下载到本地 , 更方便阅读
声明 : 本文档内容版权归属内容提供方 , 如果您对本文有版权争议 , 可与客服联系进行内容授权或下架
论文部分内容阅读
我国有着悠久的谷子栽培历史,传统手工耕作方式成本高,产量和效益不及小麦和玉米,一直是制约谷子产业化发展的瓶颈。目前,谷子种植面积减少到不足2000万亩。而近年来,人们对谷子的需求不断增长,因此,迫切需要解决谷子生产机械化问题。蔚县一直在努力探索谷子机械化播种问题,并取得了一些积极进展,得到了省市业内人士的关注。本文根据谷子播种的农艺要求,介绍了几种较好的谷子播种机械和技术。
其他文献
The metastable liquid phase separation and rapid solidification of Cu60Fe30Co10 ternary peritectic alloy were investigated by using the drop tube technique and
Six series of meso-tetrakis (4-n-alkanoyloxyphenyl) porphyrin Co and Ni complexes (12 kinds) were reported. Nine of the compounds were found to exhibit liquid c
A radiative heat transfer mathematical model for a one-dimensional long furnace was set up in a through-type roller-hearth furnace (TTRHF) in compact strip prod
Bridgman directional solidification and laser remelting experiments were carried out on Nd11.76Fe82.36B5.88 and Nd13.5Fe79.75B6.75 alloys. Microstructure evolut
The specific heat and related thermophysical properties of liquid Fe77.5Cu13Mo9.5 monotectic alloy were investigated by an electromagnetic levitation drop calor
The cold isostatic press pretreatment process was adopted to prepare fine rare earth oxysulfide upconversion phosphors with spherical shape,narrow size distribu
The glass-transition behavior of Pd40Cu30Ni10P20 bulk metallic glass was investigated by differential scanning calorimetry (DSC) and X-ray powder diffraction (X
利用超高真空扫描隧道显微镜(STM)对沉积在Si(111)-7×7重构表面上的锰薄膜在300-650℃之间的固相反应进行了研究.锰原子最初在Si(111)衬底上形成锰的纳米团簇的有序阵列,经
猪弓形体病又称弓浆虫病或弓形虫病,由龚地弓形虫引起的一种人畜共患的寄生虫病,其宿主范围广泛,包括哺乳动物、鸟类、鱼类和爬行动物。患病猪以高热、繁殖障碍、呼吸及神经症状
目前,我国有机肥利用技术落后,其生产、加工、使用及相关配套技术的滞后是导致我国有机肥利用率逐年下降的根本原因之一。针对目前国内有机肥利用现状,本文对有机肥撒施机的撒施