醌氢醌的制备及其对作物生长及根系活力的影响     

李清禄  柯玉琴 《福建农林大学学报(自然科学版)》2001,30(4):552-556

结果表明 :制备的醌氢醌产率达 88% ,纯度达 98% ;应用在作物上能促进花生、黄豆、小麦、甘薯以及水稻地上部和地下部的生长 ,提高其叶片叶绿素含量 ,增强根系活力 ,使豆科作物根瘤数目增加 ,有利作物生长 ;醌氢醌对作物的作用效果为 ,质量浓度为 10 mg· L-1的醌氢醌 >质量浓度为 5 mg· L-1的 >质量浓度为 0的 (CK) ;醌氢醌对水稻幼苗芽鞘生长以及根系生长的最佳质量浓度为 18- 30 mg· L-1.本文还简要探讨了醌氢醌影响作物生长的作用机理  相似文献   

烯唑醇防治香蕉叶斑病试验   总被引：1，自引：1，他引：1  

黄思良  晏卫红  岑贞陆  谢玲  李清标 《云南农业大学学报(自然科学版)》2002,17(4):405-407

 对烯唑醇防治香蕉叶斑病效果进行试验,结果表明,烯唑醇对香蕉叶斑病有显著的防治效果,而且对香蕉生长没有抑制作用,是一个防治香蕉叶斑病优良的杀菌剂,值得在香蕉生产上推广应用。  相似文献   

磁控摆开式呼吸阀     

黄起陆  周林书 《油气储运》1997,16(4):12-16

机械呼吸阀是油罐的重要附件，几址年来我国油库使用的机械呼吸阀基本形式是阀盘在水平面内，靠自重或弹力控制罐内压力，阀盘工作时沿导杆升降。这种呼吸阀的主要问题是：沿导杆运动引起的机械故障多；阀盘自重大，使阀盘工作时开度小，通气量小，严重时造成油罐受损。  相似文献   

小麦顶三叶与粒重关系的研究初报   总被引：1，自引：0，他引：1  

陈新宏  武军  刘淑会 《西北农林科技大学学报(自然科学版)》2002,30(4):6-8

研究了小麦不同摘叶方式下 ,顶三叶与粒重的关系及不同类型品种之间的差异。结果表明 :顶三叶的摘除对粒重的影响大小排序为旗叶 >倒二叶 >倒三叶 ,整株摘叶对粒重的影响高于主茎摘叶 ;多蘖型小麦品种主茎摘叶后千粒重降低得少 ,与整株摘叶后千粒重降低率相比差距大 ,而少蘖类型降低得多 ,降低率相比差距小  相似文献   

控制我国海洋捕捞强度所面临的问题与对策探讨   总被引：9，自引：3，他引：9  

郭文路  黄硕琳 《上海水产大学学报》2001,10(2):132-139

削减过剩的捕捞能力已成为世界渔业管理面临的一大任务大陆0年代以后我国的海洋捕捞强度迅速增长，主要是：捕捞效率高的渔具渔法迅速增长，海洋机动渔船数量和功率膨胀，渔民数量迅速上升，为控制捕捞强度，我国逐步采用了一些渔业管理措施，然而效果不明显，本文将从以下几方面分析我国控制海洋捕捞强度所面临的问题：1、我国渔业管理措施的局限性；2、渔区产业结构单一；3、大量“非渔业劳动力”入渔；为解决以上问题，本文提出了以下几点建议；1、调整渔业产业结构；2、严格执行国家海洋捕捞强度控制指标。3、实施渔船报废制度与赎买计划；4、加快实施捕捞限额制度；5、发展渔民组织。  相似文献   

黄土高原地区秋粮作物生产潜力模拟研究   总被引：7，自引：0，他引：7  

李军  王立祥  邵明安 《西北农林科技大学学报(自然科学版)》2001,29(5):56-60

应用 DSSAT3中的 CERES-谷子模型、CROPGRO-大豆模型和 SU BSTOR-马铃薯模型分别模拟研究了黄土高原 2 8个地点谷子、大豆和马铃薯的光温生产潜力 (TPP)和气候生产潜力 (CPP) ,获得了各点 6～ 15年各作物的产量潜力值 ,并统计计算了研究时段内各作物生产潜力的平均值、标准差、最高值、最低值和水分满足率 (WCR)。  相似文献   

柑橘属2n花粉自然发生与沙由柚2n花粉诱导研究     

向素琼龚桂枝  郭启高汪卫星李春艳  李晓林梁国鲁 《西南大学学报(自然科学版)》2005,27(5):616-620

果树2n配子育种较其他植物起步晚，尤其是利用2n花粉进行育种的研究在柑橘上还无先例。试验中初步观察了柑橘属部分品种的2n花粉自然发生情况，证实了柑橘属内未减数花粉的存在。同时通过秋水仙碱不同浓度与作用时间处理促进了柑橘2n花粉的发生，将长寿沙田柚2n花粉发生比例由当年的自然发生率0．87％提高到9.76％。初步观察了2n花粉离体萌发状况，其萌发率与花粉管伸长速度较为正常，但萌发启动比单倍性花粉慢。  相似文献   

The efficacy of selected biological and chemical control agents against Heterobasidion abietinum on Abies cilicica     

A. Lehtijärvi  H. T. Doğmuş‐Lehtijärvi  A. G. Aday  F. Oskay 《Forest Pathology》2011,41(6):470-476

The efficacy of 30% aqueous urea solution, borax powder and spore suspensions of Phlebiopsis gigantea and Trichoderma harzianum against establishment of artificially inoculated Heterobasidion abietinum on Abies cilicica was tested both in the field and in a simulated stump treatment experiment carried out in a growth chamber. In the field, in each of the four selected stands 20 fresh stumps per control agent were treated and 20 stumps were left as untreated controls. In two of the stands, the treatments were applied in June and in the two others in November. Stumps were sampled twice, at 6‐ and 12‐months after treatment. In the growth chamber, 10 log pieces per treatment and control were used, and sampling performed after 6‐week incubation. Results of the urea and borax treatments were consistent between the experiments; the mean efficacies were 98.8 and 99.4% in the growth chamber, and 80.2–91.3 and 89.4–90.1% in the two samplings of the field experiment, respectively. Despite the high efficacies of the P. gigantea (85.9%) and T. harzianum (97.5%) treatments in the growth chamber, efficacies of these biological control agents in the field were 47.1–49.2 and 61.3–65.5%, respectively.  相似文献   

Confirmed Exposure to Tick‐Borne Encephalitis Virus and Probable Human Cases of Tick‐Borne Encephalitis in Central/Northern Anatolia,Turkey     

K. Ergünay  M. B. Saygan  S. Aydoğan  N. Litzba  B. Şener  S. Lederer  M. Niedrig  G. Hasçelik  D. Us 《Zoonoses and public health》2011,58(3):220-227

Tick‐borne encephalitis virus (TBEV) is the aetiological agent of tick‐borne encephalitis (TBE), a potentially fatal central nervous system infection of humans. TBE is endemic in many areas of Europe and Asia; however, very scarce data on TBEV activity are available from Turkey. We aimed to identify TBEV exposure in healthy blood donors and the impact of TBEV in central nervous system infections in Central/Northern Anatolia. Two‐thousand four hundred and fifty four sera, collected from blood donors at Ankara, Konya, Eski?ehir and Zonguldak branches of the Turkish Red Crescent Middle Anatolia Regional Blood Center, were analysed for TBEV serosurveillance. Paired serum and cerebrospinal fluid samples from 108 patients with the diagnosis of aseptic meningitis/encephalitis of unknown aetiology were also evaluated to identify TBE and neuroborreliosis cases. Commercial enzyme‐linked immunosorbent assays and indirect immunofluorescence tests were employed for antibody detection. Forty‐seven donor samples (1.9%) were reactive for TBEV IgG. In 25 persons with IgG reactivity (53.1%), risk factors for tick‐borne infections were revealed. One sample from Zonguldak province (1/198; 0.5%) in the Black Sea region of Turkey was confirmed to possess neutralizing antibodies via plaque reduction neutralization test. TBEV IgM was detected in 9.2% (8/108) of the patients. IgM was accompanied by IgG reactivity in two persons where, in one, recent history of a tick bite was also identified. Intrathecal antibody production for TBEV could not be demonstrated. No evidence for Borrelia infections could be found. Confirmed exposure to TBEV and/or an antigenically similar tick‐borne flavivirus is documented for the first time in blood donors in Zonguldak in Northern Anatolia. Probable cases of TBE have also been identified from Central Anatolia. The epidemiology of TBEV activity in Turkey needs to be assessed and benefits of vaccination for general population, risk groups or travellers must be considered.  相似文献   

Analysis of Genetic Relationships among Turkish Cultivars and Breeding Lines of Lens culinatis Mestile Using RAPD Markers   总被引：1，自引：0，他引：1  

Ertuğrul Yüzbaşıoğlu  Sebahattin Özcan  Leyla Açık 《Genetic Resources and Crop Evolution》2006,53(3):507-514

Randomly Amplified Polymorphic DNA markers were used to determine the genetic relationships among Turkish lentil cultivars and breeding lines. Fourteen cultivars and thirteen breeding lines were evaluated to determine genetic variability using nine random 10-mer primers (among 45 primers). Forty-one reproducible bands were obtained, 54% of which were polymorphic. Genetic distances among cultivars and breeding lines were obtained from the simple matching coefficients (SM). The lowest genetic distance was observed between the cultivars of Ali Dayi and Kafkas with 5.0%, while ‘Seyran-96’ and ‘Ozbek’ had the highest genetic distance with 58.3%. An unweighted pair-group method with arithmetic averages (UPGMA) cluster analysis was performed on the distance matrix using Phylip software. The dendrogram clearly showed two distinct groups. The first group is composed of Akm 565 and Akm 563. The second group contains all the cultivars and remaining eleven breeding lines.  相似文献