九师日光温室设施草莓促成栽培技术

本文总结了九师日光温室设施草莓促成栽培技术,包括品种选择、种苗选择、土壤选择与整地作畦、定植、定植后的管理、温度与湿度管理、水肥管理、植株管理、授粉管理、病虫防治等关键技术。适用于塔城地区日光温室草莓的生产。     

劳动力转移对贵州省经济发展的影响

劳动力转移已经是我国一种重要的社会经济现象,对我国经济社会的发展产生着越来越重要的影响,也是促进国民经济增长的重要因素,这种转移促进了国家工业化建设和城市化进程,也已经成为促进改革的推动力,有利于沟通城乡关系,调整城乡社会结构,缓解劳动力过剩的矛盾。本文结合人口经济学相关理论描述了贵州省的劳动力转移特点,分析劳动力转移过程中对当地产生的积极影响和负面影响。并结合这些负面影响提出解决这些问题的建议和对策。     

瘤胃内丁酸钠灌注对山羊瘤胃发酵类型的影响

本试验通过对青年山羊进行瘤胃丁酸钠灌注研究其对瘤胃发酵类型的影响。6只安装有瘤胃瘘管的山羊分为试验组(n=3)和对照组(n=3),每天饲喂精料2次,并自由采食羊草。试验组每日早晨喂食1 h后开始每天按体重灌注丁酸钠(0.3 g/kg),对照组灌注等量蒸馏水,持续14 d。于灌注期的第1,5,10和14天分别于灌注前1.5 h,灌注后2 h、4 h采集瘤胃液,以气相色谱测定挥发性脂肪酸(VFA)的浓度。结果显示:灌注前、后,试验组瘤胃内乙酸、丙酸摩尔百分比和总挥发性脂肪酸浓度无显著变化;两组之间差异不显著。但试验组丁酸摩尔百分比在灌注2 h后显著上升(P<0.01),4 h后呈下降趋势,次日采食前恢复至正常生理范围。对照组与试验组pH在各采样时间点间基本无显著差异。试验表明青年山羊瘤胃灌注该剂量丁酸钠不引起瘤胃发酵类型的改变。     

现代养鸡生产中鸡新城疫（ND）的科学防控

随着禽流感疫苗的普遍使用。禽流感疫情渐趋于平静,ND的流行会更加凸显出来。目前我国家禽饲养量适140亿只,据初步估算我国每年因禽病损失超过100亿元人民币,而在禽病中无论是从发生的范围还是从发生的频率及危害的严重程度来看,排在首位的就是ND!应加大科研的投入和力度。加快新型高效疫苗的研制,对DNV的变异和致病机理及流行特点进行更深入的研究,以便动态地掌握ND的流行规律,适时调整ND的防控方案,为ND的综合防控做好技术储备,为养禽业的健康和可持续发展提供强大的技术支撑。     

兽医药理学双语教学的实践及思考

开展双语教学是目前我国高等院校教学研究及改革的主要内容之一。笔者结合河北农业大学兽医药理学教研组进行兽医药理学双语教学的实践经验,从双语教材、多媒体制作、教学团队、教学模式、学生的英语学习程度、对双语教学的重视程度、利用网络资源提高双语教学效率等多方面进行了阐述,并提出了双语教学工作中可以改进的方面,以期更好地开展双语教学,培养更多的国际化人才。     

Application of Evolutionary Programming in Optimal Reactive Power Dispatch

This paper describes an application of evolutionary programming(EP) to reactive power optimization and voltage control of power systems.Some technical problems which conclude mutation sacle,fitness value and population size have been solved to make EP practical for solving the optimal power flow problems.The computational results with EP have been compared with those obtained from a conventional gradient based optimization method.The comparision shows that EP are better than conventional methods in dealing with the optimization of noncontinuous and nonsmooth funcnons.The EP show the ability to search for the global optimum in reactive optimization that has multiple optima.     

施用有机肥和有效微生物群对玉米叶片持水力的影响

A red soil derived from Quaternary red clay was employed to study nutrient leaching with woil columns repacked in laboratory,The objective was to identify the effects of fertilization practices on leaching patterns and magnitudes of Ca^2 ,Mg^2 ,K^ ,NH4^ ,and NO3^-,The treatments were CK (as a control),CaCO3, CaSO4,MgCO3,Ca(H2PO4)2,urea,KCl,and multiple (a mixture of the above-mentioned fertilizers),The fertilizers were added to the bare surface of the soil columns,and then the columns were leached with 120 mL deionized water daily through peristaltic pumps over a period of 92 days.Leaching processes of NH4^ ,and NO3^- wer e only measured in CK,ured,and multiple treatments which were directly related to N leaching, Results showed that sole application of CaSO4,and Ca(H2PO4)2 scarcely hd any effect on the leching losses of Ca^2 ,Mg^2 ,and K^ ; the application of MgCO3 sthimulated the leaching of Mg^2 ;the application of CaCO3 promoted the leaching of Ca^2 ,Mg^2 and K^ ; urea treatment also promoted the leaching of K^ and NH4^ ,and NO3^- leaching mainly occurred at late stage of leaching process in particular;under KCl treatment,leaching of Ca^2 ,Mg^2 ,and K^ was promoted to a large extent;under multiple treatment, leaching of Ca^2 ,Mg^2 ,K^ ,NH4^ ,and NO3^- was all increased and NO3^- was mainly leached at the end of leaching process and still had a trend of increase.