杂交稻新组合选育的合理产量因子构成初探

对杂交稻新组合区域试验资料进行综合分析,结果是增产组合与对照相比,增产的主要原因是靠穗粒数的增加,提出新组合选育合理的产量因子构成为早中熟组合有效穗310万/hm~2以上,穗粒数100粒左右,千粒重27克左右;迟熟组合有效穗300万/hm~2左右,穗粒数120粒以上,千粒重28克左右。     

彰武县观光休闲农业的特点及发展对策

介绍了彰武县观光休闲农业发展现状,分析了观光休闲农业的特点和存在的问题,并提出了发展观光休闲农业的对策,以期为观光休闲农业的发展提供参考。     

基于文献计量法分析我国猪圆环病毒的研究现状

为我国猪圆环病毒的深入研究提供参考,以CNKI数据库中国学术期刊网络出版总库检索了我国猪圆环病毒的文献。结果表明:至2013年底,共有文献2732篇,其中基金项目文献659篇,发表16篇及以上的核心作者有20人,研究机构主要是高校和研究所,检测类文献的被引频次和下载频次均较高。     

应用灰色关联度探讨贵州省水稻区域试验试点布局

用灰色关联度分析方法对贵州省水稻区域试验点试验价值的优劣次序作了初步评定。结果表明:兴义试点是最好的试验点,其次是关岭点,思南试点的试验价值最差。     

苏泗庄引黄工程老化失修情况的调查分析

我省引黄灌溉工程,对保证农业生产发展,解决工业和城乡生活用水发挥了重要的作用。但是,引黄灌溉工程经过20～30年的运用,再加上原来工程标准低、质量差,维修管理跟不上,工程设施老化失修,甚至遭到破坏,严重影响了工程效益的发挥。因此,很有必要对现有引黄灌溉工程进行全面调查,摸清工程现状,找出存在的主要问题,研究解决办法,为今后如何管好用好工程提供依据。现将苏泗庄引黄灌区情况整理分析如下。     

花期极端低温对杂交籼稻的影响

2002年8月9日至8月21日贵州遭受历年罕见的极端低温危害.据统计,全省稻谷减产112万t,平均减少24.4%.在这次极端低温条件下,杂交籼稻不同组合间花期耐冷性表现出明显的差异.分析发现同一品种(组合)在孕穗期和开花期遇低温对结实率的影响最大,如孕穗期和开花期分别遇低温,以开花期对结实率的影响最大.开花期伴随降雨结实率更低.     

一例貉肠炎型犬瘟热继发沙门菌的诊治

2011年7月份,诸城市某养殖户饲养的貉发生了一种以眼有脓性分泌物并以胃肠道症状为主要特征的疾病,笔者根据临床症状、剖检变化、实验室诊断最终确诊为犬瘟热继发沙门菌感染。1临床症状该场共饲养貉300多只,其中种貉50多只,仔貉250只。种貉无明显症状,主要是仔貉发病,大群发病20 d,一共100多只陆续发病,发病笼舍集中,就诊时已死亡70多只。就诊前2周前接种过犬瘟热疫苗,接种后发病加剧,仅接种后仔貉死亡多达     

屠宰场点旋毛虫的宰前检疫与宰后检验

猪旋毛虫是由毛首目毛形科的毛线虫引起的,其成虫寄生于小肠(肠旋毛虫),幼虫寄生于各部肌肉(肌旋毛虫).犬、猪、猫、羊和人均可感染.我国以西藏、云南和东北各省较多见.旋毛虫主要寄生于膈肌、喉肌、舌肌,引起的危害十分严重,不仅影响养猪业的发展,造成重大经济损失,而且给人体健康带来严重威胁,是肉品卫生检疫的重点项目之一.所以,国家将猪旋毛虫病列为重点动物疫病之一,大力开展预防、控制、净化工作.     

长白山高山冻原生态系统植被生物量分布和养分生物循环研究(英文)

A study was conducted to test the correlation between biomass and elevation and the differences in concentration and storks of nutrients among five vegetation types (Felsenmeer alpine tundra vegetation-FA, Lithic alpine tundra vegetation-LA, Typical alpine tundra vegetation-TA, Meadow alpine tundra vegetation MA, and Swamp alpine tundra vegetation-SA) on alpine tundra of Changbai Mountains,Jilin Province, China in growing seasons of 2003, 2004 and 2005. The biomass of 43 mono-species and soil nutrients in alpine tundra ecosystem were also investigated. Dominant species from Ericaceae (such as Rhododendron chrysanthum and Vaccinium jliginosum var.alpinum) were taken to analyze organ biomass distribution. Result showed that the biomass and elevation had a significant correlation (Biomass=-237.3 In(Elevation) 494.36; R2=0.8092; P＜0.05). No significant differences were found in phosphorus and sulphur concentrations of roots, stems and leaves among the five vegetation types. There were significant differences in nitrogen and phosphorus stocks of roots, stems and leaves and in sulphur stock of stems and leaves among TA, MA, and SA vegetation types (p＜0.05). The nutrient stock of five vegetations was averagely 72.46 kg·hm-2, of which N, P, S were 48.55, 10.33 and 13.61 kg·hm-2, respectively. Soil N and S concentrations in meadow alpine tundra soil type was significantly higher than those in other four soil types (Cold desert alpine tundra soil, Lithic alpine tundra soil, Peat alpine tundra soil, and Gray alpine tundra soil). Phosphorous concentration in SA type was higher (p＜0.05) than in other types. Soil nutrient stock (0-20cm) was averagely 39.59 t·hm-2, of which N, P, S were 23.74, 5.86, 9.99 t·hm-2, respectively.