耕整机齿轮热处理工艺研究

齿轮是耕整机的关键零件,通过对齿轮工况及耕整机工作时的受载分析,制定出齿轮机械加工工艺路线,并确定其热处理工艺参数。按该热处理工艺制造的齿轮,表层金相组织为回火马氏体和均匀分布的细粒状炭化物,心部为低碳马氏体及少量的铁素体,齿部硬度为HRC56-62,能满足设计要求。     

江苏省的菜用大豆新品种及其高产栽培技术研究

为了鉴定在江苏省鲜食大豆区域试验中表现优良的新品系的丰产性，抗病性和适应性，为大面积种植提供适合江苏栽培的新品种，通过最近6年的区域和生产试验，共审定春夏不同季节栽培的菜用大豆新品种8个，极大地推动了江苏省菜用大豆新品种的推广与种植。本文主要介绍了目前在两种不同生长季节的菜用大豆的主栽品种，并对目前江苏不同季节菜用大豆主栽品种的相关栽培技术进行了研究。     

Characterization of white sapote (Casimiroa edulis Llave & Lex.) germplasm using floral morphology,RAPD and AFLP markers

Floral morphology, random amplified polymorphic DNA (RAPD), and amplified fragment length polymorphism (AFLP) were used to characterize and verify genetic diversity within a white sapote cultivar collection and to develop molecular markers for germplasm identification. On the basis of floral morphology, the cultivars were classified into three types: type I included 23 cultivars with large ovaries and small anthers; type II included 13 cultivars with small ovaries and large anthers; and type III included one cultivar, named ‘Maltby’, with a large ovary and large anthers. DNA was isolated from 39 cultivars of white sapote and subjected to RAPD and AFLP analysis using 24 and 7 primers, respectively. One hundred and sixty-eight RAPD and 286 AFLP bands were used to assess genetic characterization among white sapote. Sixty percent of the RAPD and 77% of the AFLP amplification products were polymorphic among accessions. RAPD or AFLP markers differentiated all white sapote cultivars effectively. Moreover, each flower type was characterized as specially associated with two RAPD bands. UPGMA dendrograms based on RAPD and AFLP data, showed the majority of the cultivars from flower type I and flower type II clustering together. Finally 101 RAPD markers and 220 AFLP markers were used to construct a neighbor-joining dendrogram. This showed that the 37 cultivars could be classified into six distinct clusters, between which the similarity coefficient was as low as 0.00–0.55, even though the cultivars were morphologically very similar. The remaining two cultivars namely ‘Smathers’ and ‘Maltby’ were found genetically very distant from the other cultivars in RAPD, AFLP or combined RAPD and AFLP based dendrograms. The results suggested that the level of genetic variation among white sapote cultivars is diverse and the morphological and molecular data may lead to representation of the cultivar relationships as well as flower type discrimination.     

不同菠萝品种 杀菌剂和褐变抑制剂对鲜切菠萝贮藏品质的影响

研究了不同菠萝品种鲜切后冷藏的保鲜效果及不同杀菌剂和护色剂处理对鲜切菠萝保鲜效果的影响。结果表明,菠萝鲜切后在贮藏后期仍可保持较高的感官品质,并使果实保持一定的VC,TA,TSS含量。采用诺福水处理可明显抑制微生物的生长、保持鲜切菠萝的食用品质、延长货架期。采用质量分数为1%的抗坏血酸处理可显著地减缓果肉的褐变、色度L值和硬度的变化。     

高原型3Z系列中耕机用旋耕刀设计

云南省农业机械研究所根据多年来对旋耕刀的研究及推广应用,采用经验公式来进行旋耕刀侧切刃曲线的设计计算,设计出适合于中耕机旋耕作业要求的五种规格旋耕刀,满足在云南省多秸秆和绿肥等的粘重土壤田地旋耕作业的农艺要求,同时此种旋耕刀也能够应用于在云南省使用的微耕机和小型手扶拖拉机旋耕机对旋耕刀的使用要求.     

江苏省的菜用大豆新品种及其高产栽培技术研究

为了鉴定在江苏省鲜食大豆区域试验中表现优良的新品系的丰产性,抗病性和适应性,为大面积种植提供适合江苏栽培的新品种,通过最近6年的区域和生产试验,共审定春夏不同季节栽培的菜用大豆新品种8个,极大地推动了江苏省菜用大豆新品种的推广与种植。本文主要介绍了目前在两种不同生长季节的菜用大豆的主栽品种,并对目前江苏不同季节菜用大豆主栽品种的相关栽培技术进行了研究。     

丘陵山区茶园中耕机械化研究进展

我国茶园主要分布在丘陵山区地带,由于环境复杂,茶园翻耕作业一直是茶园生产机械化中的重难点问题。结合丘陵山区茶园机械化生产情况,分析茶园中耕作业中存在的问题,总结了近年来丘陵山区茶园中耕机械化的研究新动态。     

茶园中耕机减震吸震技术探索

该研究旨在解决茶园中耕机作业过程中机器震动幅度较大的问题，通过调整机器部件布局、完善底盘设计、采用液压与弹簧机构，同时优化设计楔形外壳达到减震目的。     

中耕施肥机械技术研究现状及发展趋势

中耕、施肥是我国农业的重要作业环节。文章论述了国内外中耕施肥机械的现状、结构特点及存在的问题;对中耕施肥机械技术发展趋势进行了分析预测。     

一种小型茶园中耕机的研制

该小型茶园中耕机主要针对我国南方茶园机械耕作过程中茶树树枝阻碍及枯枝、杂草缠绕实际情况,在烟草作物中耕机基础上进行的改进设计。本设计方案通过在旋耕刀旋转机构上方安装一组与之相对应的静刀片,通过静刀与动刀相互之间的间隙配合,利用静刀片上的锯齿形切刀将缠在旋耕刀上的杂草切断,再通过旋耕刀的翻转作业,将切断的草渣和短碎枯枝埋...