马铃薯晚疫病流行学及防治方法研究进展   总被引：13，自引：3，他引：13  

曹静  客绍英 《中国马铃薯》2005,19(1):33-36

马铃薯晚疫病流行性强,危害严重,是限制马铃薯生产的主要病害之一。针对目前生产上该病害防治困难的现状,本文综述了马铃薯晚疫病流行学和防治方法的研究进展,并对今后的研究提出了建议。  相似文献   

外源添加物降低镉胁迫下香菇体内镉含量及对酶活性的影响   总被引：1，自引：0，他引：1  

杨晖  赵鹂  张龙  梁巧玲  柯乐芹 《核农学报》2015,29(1):183-191

香菇等可食用菇类比绿色植物体内更能逐步聚集浓度大的镉等重金属。子实体中的镉危及食用者的健康,因此减少菇类子实体中镉的含量,对人体健康意义重大。本研究检测了5种外源添加物水杨酸、沸石、石膏、壳聚糖及硫酸锌对镉胁迫下香菇体内镉含量的降低作用,并测定不同添加物对香菇羧甲基纤维素酶和漆酶活性的影响。试验结果表明,被测试的添加物中,硫酸锌对香菇808和868子实体中的镉含量著,石膏次之,表明硫酸锌是5种外源添加物中降低香菇体内镉浓度的最佳选择。此外,通过测定5种外源添加物在3 mg·kg-1镉胁迫下对香菇羧甲基纤维素酶和漆酶活性的影响,试验数据表明菌丝满袋期时,在添加硫酸锌或石膏时,香菇羧甲基纤维素酶和漆酶活性达到最高,说明培养料中添加硫酸锌或石膏在降低香菇体内镉含量的同时,也可以一定程度上增强生长代谢酶的活性。  相似文献   

安庆市宜秀区现代农业发展现状与对策     

柯冬芹 《安徽农业科学》2015,(8):264-266

近年来,安庆市宜秀区大力实施“产业富民”发展战略,充分发挥区位优势和资源优势,为现代农业的发展奠定了坚实的基础.该研究基于现代农业的内涵,分析了宜秀区现代农业发展的现状及存在的问题,提出了宜秀区现代农业发展的思路与对策,以实现农业发展、农村繁荣、农民增收的目标,打造“宜游宜秀”.  相似文献   

不同浓度有机水溶肥对热带设施甜瓜产量和品质的影响     

柯用春  曹明  杨小锋  任红  黄植  王育瑞  陈广旺  林福  许江伟 《新疆农业科学》2015,(2):217-221

【目的】研究叶面施肥对热带设施甜瓜产量及品质影响,探讨甜瓜有机水溶肥叶面施肥的应用效果,为热带设施甜瓜叶面肥的推广提供理论与实践依据。【方法】设计肥料浓度4种水平组合,以清水为对照,研究有机水溶肥料不同浓度对热带设施栽培甜瓜生长发育、产量和品质的影响。【结果】喷施有机水溶肥料的处理各次观测的叶片面积较对照高16.56%、18.36%和7.38%。叶片SPAD值平均较对照分别提高了13.75%、14.98%和13.70%。甜瓜纵横径增加,纵径分别提高6.75%、14.53%、15.88%和16.65%,横径分别提高3.28%、7.12%、9.33%和9.47%。随着用量的增加,产量也呈增加趋势,增产比例分别为9.01%、26.44%、28.50%、31.02%。【结论】不同浓度水溶肥料叶面喷施对热带设施甜瓜产量和品质有明显影响,采用伸蔓期200 ml/(667 m2·次),其它时期250 ml/(667 m2·次)的喷施方法可显著提高产量,提升品质。  相似文献   

中国股票市场理论价值定位探讨     

柯原 《福建农业大学学报(哲学社会科学版)》2005,8(3):40-44

回顾了中国证券市场理论估值的研究,发现用平均市盈率进行国际比较对股票市场估值有较大缺陷.认为一个国家股票市场的理论价值定位必须考虑一国的利率、经济增长率、国家风险等.本文运用两元增长模型加入国家风险对中国股票市场进行理论估值探讨,认为中国股票市场目前的估值合理,具备投资价值.  相似文献   

Immunogenicity of a temperature sensitive mutant Mycoplasma gaffisepticum vaccine     

KG WHITHEAR  SOERIPTO  KE HARRIGAN †  E GHIOCAS 《Australian veterinary journal》1990,67(5):168-174

The immunogenicity of the ts-11 vaccine strain of Mycoplasma gallisepticum was assessed following eye drop or coarse aerosol administration in chickens of various ages. Protection was evalualted following intra-abdominal (IA) or fine droplet aerosol administration of virulent M. gallisepticum, usually the Ap3AS strain and was measured mainly by the scoring of gross air sac lesions or by egg production. Vaccination of chickens with ts-11 did not elicit a substantial serum antibody response as measured by rapid serum agglutination test, or ELISA. Protection was never demonstrated when no M. gallisepticum serum antibody response was detected in a vaccinated group of chickens. Failure to protect occurred usually, although not invariably, following aerosol administration of the vaccine. Vaccination by eye drop usually, although not invariably provided protection against challenge. In one experiment, chickens vaccinated by eye drop at 8-weeks were as susceptible as non vaccinated controls when challenged by IA inoculation at 13-weeks-of-age. Yet other birds from the same vaccinated group were resistant when challenged in an identical way at 23-weeks. No measurable increase in M. gallisepticum specific serum antibody concentrations occurred in the intervening period. Equally surprising was the response of another group of birds in the same experiment that had been vaccinated with a higher dose of ts-11. An antibody response was detected in this group, but they were susceptible to challenge at 23-weeks. Interestingly, a drop in egg production commenced 4 weeks after challenge, 2 weeks later than that observed in a non vaccinated group challenged at the same time.(ABSTRACT TRUNCATED AT 250 WORDS)  相似文献   

Relationships between electrocardiographic findings, racing performance and training in Standardbred horses     

DL EVANS  KE POLGLAZE† 《Australian veterinary journal》1994,71(11):375-378

SUMMARY The presence of abnormal T waves in three or more electrocardiographic leads has been used to diagnose the cause of poor race performance in horses. This study investigated the relationship between previous racing performance in Standardbred horses and T waves, and the effect of training on the T wave. Thirty-two horses were electrocardiographed in two Sydney racing stables. Sixteen horses (50%) had ECGs with three or more leads with abnormal T waves, and these horses had won more races, had a greater ratio of wins per start and a greater number of dollars earned per start than horses with less than three abnormal T waves (P < 0.05). Horses with abnormal T waves also had significantly faster racing times (P < 0.01). There were significant (P < 0.01) correlations between the number of abnormal T waves and both number of wins (R = 0.47) and dollars earned per start (R = 0.45). Fastest winning mile rate was also negatively correlated with number of leads with abnormal T waves (R =?0.52, P < 0.01). Twenty two horses were also electrocardiographed within seven days of good racing performance. The mean number of abnormal T waves was 2.7 ± 0.41, and the mean T wave amplitude in the four chest leads (CV, CR, CL, CF) was 0.9 ± 0.15 mV. Thirteen horses (59%) had abnormal T waves in three or more leads. The effect of training on the T wave was also investigated in nine previously untrained and unraced Standardbred racehorses. There were significant effects of training (P < 0.01) on the number of abnormal T waves and mean chest lead T wave amplitude. These increases occurred in the second phase of training during which faster exercise, race trials and racing were conducted. We concluded that abnormal T waves are a common finding in the race-fit Standardbred horse, and can be found in more than 50% of horses currently performing well in races. In addition, chest lead T waves become more positive after training.  相似文献   

2个多年生花生品种低温胁迫下活性氧代谢特性研究   总被引：1，自引：0，他引：1  

余高镜  应朝阳  黄毅斌  柯碧南  庄重光  翁伯奇 《草业科学》2006,23(4):29-32

不同低温胁迫下对平托花生Arachis pintoi与蔓花生A.duranensis2个多年生花生品种进行的叶片活性氧代谢与质膜特性进行研究。结果表明,A.duranensis品种无论在超氧化物岐化酶(SOD)、过氧化物酶(POD)还是过氧化氢酶(CAT)相对活性在低温胁迫下均不低于或显著高于A.pintoi,表现出相对较高的清除自由基能力;其质膜相对透性(RPP)增加幅度明显小于A.pintoi;丙二醛(MDA)相对含量增加率则表现出相反趋势;表明A.duranensis具有更强的抗寒性。  相似文献   

汕头港海域氮、磷营养盐环境容量及排放总量控制的研究     

张静  柯东胜  方宏达  孙省利 《大连水产学院学报》2012,27(3):247-254

采用带有干湿网格技术的POM08模型,对汕头港海域的二维垂向平均潮流场进行了数值模拟;同时耦合二维物质输运方程,采用分担率法计算了该海域6个人海污染源的氮、磷营养盐环境容量,并在此基础上进行了减排方案设计模拟。结果表明：水动力模拟结果与实测数据吻合较好;在对汕头港6个污染源的氮、磷营养盐的总量控制中,应重点关注榕江、外沙河、梅溪和新津河各污染物的入海通量;整个汕头港海域氮污染较严重,现有监测质量已不满足规定的水质保护目标,需采取严格的削减措施;整个汕头港海域磷污染相对较轻,采取一定的减排措施可以达到规定的水质保护目标;对于无机氮,榕江至少要减排95％,外沙河减排65％,其余污染源减排90％或适当降低减排率,才能使整个汕头港海域无机氮浓度基本满足相应的水质保护目标;对于活性磷酸盐,榕江至少要减排5％,梅溪、外沙河减排25％,其余污染源减排5％,才能使整个汕头港海域活性磷酸盐浓度基本满足相应的水质保护目标。  相似文献   

精校机电液位置伺服系统的极点配置自校正控制     

陈永新  柯尊忠  伍德林 《安徽农业大学学报》2012,39(2):315-317

常规控制方法很难对变参数系统实现精确控制。建立精校机电液位置伺服系统离散数学模型,研究其常规控制方法。将极点配置自校正控制理论应用于精校机电液位置伺服系统中,提出该系统的极点配置自校正控制方法。仿真结果表明,系统的控制精度和跟踪性能将得以提高。  相似文献