日光温室CO2自动施肥系统的研制     

哈敏  李波  刘文合  张振厚 《沈阳农业大学学报》2001,32(6):473-475

研制了具有自动化特征的CO2施肥系统及其技术，并对该项技术的施肥效果进行了试验。结果表明：利用此装置，日光温室内的CO2浓度均匀程序较好，经济上可行，且气源来源广泛，长期施用对大气和土壤无污染，该项施肥技术加速了中国温室生产技术与世界发达国家接轨的进程。  相似文献   

农业分析实验课考试办法及标准     

席玉琴  王金娥  臧凤艳  哈玲津  张美婷 《天津农学院学报》2001,8(1):51-53

根据农业分析实验课的特点及内容提出了考试的办法，考试和考核的积分情况，制定了评分的标准以及有关扣分的说明。  相似文献   

小麦锌营养效率的研究进展   总被引：7，自引：0，他引：7  

蒿宝珍  姜丽娜  李春喜  邵云 《安徽农业科学》2007,35(25):7756-7758

综述了小麦锌营养效率的基因型差异及其对小麦生长发育、产量的影响,并展望了小麦锌营养效率的研究方向。  相似文献   

A physical map of the 1-gigabase bread wheat chromosome 3B   总被引：2，自引：0，他引：2  

Paux E  Sourdille P  Salse J  Saintenac C  Choulet F  Leroy P  Korol A  Michalak M  Kianian S  Spielmeyer W  Lagudah E  Somers D  Kilian A  Alaux M  Vautrin S  Bergès H  Eversole K  Appels R  Safar J  Simkova H  Dolezel J  Bernard M  Feuillet C 《Science (New York, N.Y.)》2008,322(5898):101-104

As the staple food for 35% of the world's population, wheat is one of the most important crop species. To date, sequence-based tools to accelerate wheat improvement are lacking. As part of the international effort to sequence the 17-billion-base-pair hexaploid bread wheat genome (2n = 6x = 42 chromosomes), we constructed a bacterial artificial chromosome (BAC)-based integrated physical map of the largest chromosome, 3B, that alone is 995 megabases. A chromosome-specific BAC library was used to assemble 82% of the chromosome into 1036 contigs that were anchored with 1443 molecular markers, providing a major resource for genetic and genomic studies. This physical map establishes a template for the remaining wheat chromosomes and demonstrates the feasibility of constructing physical maps in large, complex, polyploid genomes with a chromosome-based approach.  相似文献   

应用HACCP理念建立食品辐照企业GIP管理体系的探讨   总被引：1，自引：1，他引：1  

卢江  李淑荣  石华  周洪杰  李瑞松  吴坤  哈益明 《核农学报》2005,19(3):198-201

本文应用HACCP基本理念分析了食品辐照加工过程存在的危害因素及质量控制的关键控制点。深入探讨了建立食品辐照加工企业GIP管理体系的原则和方法。  相似文献   

Disease of geese caused by a new herpesvirus   总被引：3，自引：0，他引：3  

PJ KETTERER  BJ RODWELL  HA WESTBURY†  PT HOOPER†  AR MACKENZIE‡  JG DINGLE§  HC PRIOR 《Australian veterinary journal》1990,67(12):446-448

A goose flock farmed outdoors in south-eastern Queensland suffered an outbreak of peracute disease with high death rate (97%). Small button ulcers and large plaques overlying lymphocyte aggregates were present on the mucosa of the small intestine of affected birds. Small white foci of necrosis and focal haemorrhages were seen in the livers. Numerous intranuclear inclusion bodies were observed microscopically in hepatocytes and a herpesvirus which grew rapidly in chicken kidney cells was isolated from tissues. Duck virus enteritis (DVE) was suspected but DVE antiserums failed to neutralise the virus. Further serological studies with a limited range of known avian herpesviruses have failed to identify the virus. Experimental transmission resulted in high mortality in geese (100%), lower mortality in ducklings and nil mortality in chickens. Surveillance studies showed no evidence of infection in domestic and wild birds beyond the original farm and the infection appears not to have been established in the area. Wild ducks, which were frequent visitors to the farm dam, were considered the most likely source of the infection.  相似文献   

Molecular pathotyping of two avian influenza viruses isolated during the Victoria 1976 outbreak   总被引：3，自引：0，他引：3  

JB BASHIRUDDIN  AR GOULD  HA WESTBURY 《Australian veterinary journal》1992,69(6):140-142

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Aetiology and Endocrinology of Pseudopregnancy in the Goat     

MAM Taverne  JW Hesselink    MM Bevers  HA van  Oord JE Kornalijnslijper 《Reproduction in domestic animals》1995,30(4):228-230

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Avian influenza     

HA WESTBURY 《Australian veterinary journal》1989,66(12):427-428

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The Impact of Migration on Social Capital: Do Migrants Take Their Bowling Balls with Them?     

JAMES P. LESAGE  CHRISTINA L. HA 《Growth and change》2012,43(1):1-26

Questions surrounding the impact of population migration on social capital is the focus of this study. Putnam observed that “for people as for plants, frequent repotting disrupts root systems. It takes time for a mobile individual to put down new roots.” However, because of a trending decrease in mobility over time, Putnam rules out migration as an explanation for the long‐term decline in social capital that was the subject of his widely read 1995 book Bowling Alone: America's Declining Social Capital. This study undertakes an empirical examination of the impact of migration on county‐level social capital, which in tribute to Putnam one might view as an attempt to answer the question—do migrants take their bowling balls with them when they move? The potential for county‐level migration of population to impact social capital levels at particular locations in space arises from the conventional argument that social capital promotes trust and cooperation among agents. This trust increases socially efficient collective action but requires investment in relationships and commitment of scarce resources to build social capital. It seems plausible that migration of population might have a negative impact on the stock of social capital by interfering with trust and cooperation among agents. However, it is also possible that migrants may take their social capital with them to new places of residence. In other words, the propensity to join social and civic organizations might reflect inherent traits of individuals who are willing to make commitments of their resources to building social capital in any community where they reside.  相似文献