永州国家基本气象站人工与自动观测雨量的差异分析     

李琼  龙志宇 《现代农业科技》2011,(23):21+26

以永州国家基本气象站(57866站)2009年1月1日至2010年12月31日的雨量值为样本,分析了各月人工与自动观测雨量记录的差值及不同雨量级别时雨量的差值及其方差值的大小,结果表明各个月份及各项雨量级别的人工与自动雨量差值及方差值均较小,对历史雨量资料序列的连续性影响不大。  相似文献   

DZN-1自动土壤水分观测仪的组成及故障分析     

孙青然  郭晓霞  王少梅  闫瑞华  陈广瑞 《现代农业科技》2011,(3):315+325

介绍了DZN-1自动土壤水分观测仪系统组成,针对自动土壤水分观测仪出现的一次故障,进行了故障分析与排除,以期为类似故障的检查和排除提供借鉴。  相似文献   

大果沙棘溃疡病病原菌的鉴定及生物学特性研究   总被引：1，自引：0，他引：1  

张兵  陈晶晶  刘玉  刘雪峰  阿地力·沙塔尔 《新疆农业大学学报》2011,34(2):140-145

对大果沙棘溃疡病的症状、病原菌形态学特征、致病性测定以及生物学特性进行了研究。根据病原菌的形态特征鉴定为壳梭孢属葡萄生壳梭孢（Fusicoccum viticolum）。室内外的回接试验结果表明,壳梭孢菌是大果沙棘溃疡病的病原菌。通过生物学特性研究,壳梭孢菌生长的适宜温度为25~28℃,最佳为25℃,最佳pH值为7.5,全光照条件下生长速度较快,生长的最佳碳源为蔗糖,最佳氮源为牛肉膏。  相似文献   

1个水稻雌配子不育突变体的筛选及初步分析     

颜静宛  吴照祥  刘华清  王锋 《福建农业学报》2011,26(4):513-518

在水稻转基因后代中,筛选到1个与雌配子育性相关的突变体,该突变体自交后代群体外源标记基因(潮霉素磷酸转移酶hpt)保持1∶1的分离规律,连续6代自交没有得到纯合株系;正、反杂交以及测交分析显示,潮霉素抗性基因只能通过雄配子进行传递;结实率统计分析表明具有外源标记基因hpt的单株有近乎一半的雌配子发生败育,胚囊的育性与外...  相似文献   

棉花穴盘育苗移栽高产示范试验   总被引：1，自引：0，他引：1  

戴祥  毛筱晔  陈宽兵 《河北农业科学》2011,15(1):16-17

采用对比设计,研究了棉花穴盘育苗移栽栽培方式与地膜直播栽培方式（CK）对棉花生长和产量的影响。结果表明：棉花穴盘育苗移栽栽培方式的棉花生育期较CK长12 d,虽然全生育期整齐度和苗期生长势较CK差,但花期和絮期的生长势好于CK,单株成铃数明显增多,增产显著。棉花穴盘育苗移栽栽培方式可以在生产上大面积推广应用。  相似文献   

高简并引物小温度范围不规则降落PCR在庞大基因家族扩增中的应用（摘要）     

华慧颖  王芳  常重杰  杜启艳 《农业科学与技术》2011,12(2):188-190

[目的]探讨了高简并性引物扩增庞大基因家族基因的特殊方法。[方法]采用常规高简并引物对鲤鱼基因组DNA分析进行了常规PCR扩增、常规降落PCR扩增以及优化后的小温度范围不规则跳跃降落PCR扩增。[结果]采用PCR仅得1条明显条带,得到的基因较少;采用常规降落PCR法仅得到弥散性扩增,无明显条带出现;而采用小温度范围的不规则跳跃降落PCR则得到了得到了3条明显条带和多个基因,扩增结果理想。[结论]为庞大基因家族扩增条件中的优化与选择提供了理论依据。  相似文献   

二氧化氯对沙门氏菌生物被膜的影响     

毛金林  郜海燕  陈杭君  葛林梅  陈秋云 《浙江农业学报》2010,22(1):0

通过扫描电镜和测定数据表明,在不锈钢表面形成的沙门氏菌生物被膜培养8 h后细菌密度达到3×10⁶ cfu/cm²;沙门氏菌以生物被膜的形式生长比以浮游形式对二氧化氯具有更强的抵抗能力;胰酶大豆肉汤(tryptone soy broth,TSB)等营养物质能明显减弱生物被膜对二氧化氯的敏感性。  相似文献   

Influence on new tunnel mechanics behaviorinduced by construction about adjacent spacing     

LIU Xin-rong  GUO Zi-hong  WANG Ji-ming  PEI Li  LIN Zhi  WANG Fang-qi 《保鲜与加工》2010,(12):54-59

This paper takes Chongqing Two-River Tunnel as the research background, based on the system for structure and surrounding rockmass of the highway tunnel, conducts a three-dimension model test about forked tunnel with different altitude to study new tunnel’s mechanics behavior induced by construction, and uses numerical simulation to analyze model domain. The results show that the displacement on new tunnel’s left hance is larger than the displacement on its right hance. Left hance displacement is larger than hance displacement of the single tunnel, and the right hance displacement is less than hance displacement of the single tunnel. The trend of hance displacement and crown settlement with different adjacent spacing is got. Normalizing hance displacement and crown settlement of model test, the relation between displacement and adjacent spacing is disclosed. The hance displacement and crown settlement gained by numerical simulation is close to the converted result of model test, which indicates that the model test data is consistent with the result of numerical simulation.  相似文献   

梨抗黑星病AFLP标记筛选   总被引：1，自引：0，他引：1  

董星光  方成泉  王斐  王志刚  樊丽  林盛华 《植物病理学报》2010,40(5):552-555

 Pear scab caused by Venturia nashicola is one of the most destructive diseases of pears. Molecular markers linked to scab resistance gene is expected to be useful for improving pear. In this study, the F₁ population derived from the cross of ‘Huangguan’ and ‘Yali’ was analyzed genetically. The resistance of pear to scab was proved to be controlled by a single gene in a dominant manner. Bulked segregant analysis (BSA) was conducted to screen 64 fluorescent AFLP primer pairs. A marker designated as D3-365 was found to be linked to the resistant locus. Selective genotype linkage analysis showed that the genetic distance between the marker and the resistant locus was 14.9 cM.  相似文献   

Detection of cows with insemination problems using selected classification models     

Wilhelm Grzesiak  Daniel Zaborski  Piotr Sablik  Agata ?ukiewicz  Andrzej Dybus  Iwona Szatkowska 《Computers and Electronics in Agriculture》2010,74(2):265-273

In the present study, the detection of cows with artificial insemination (AI) difficulties using selected statistical and machine learning methods is presented. Cows were divided into two classes: those that conceived after one or two services (“GOOD”) and those that required more than two services per conception (“POOR”). The best performance was exhibited by one of the artificial neural networks (ANN) and the multivariate adaptive regression spline (MARS) method (AIC, BIC, RMS and accuracy); whereas logistic regression (LR) and classification functions (CF) were of somewhat lower quality. The detection of cows with AI difficulties, performed on the basis of the test set comprising new instances, showed that the ANN and MARS were more precise in comparison with the statistical methods. Sensitivity and specificity were over 85% for the perceptron with two hidden layers (MLP2) and MARS and approximately 80% or lower for LR and CF. From among variables determining the AI category, the average calving interval and cow body condition index were the most important. Other significant variables were lactation number, pregnancy length, sex of calf from previous calving and cow age. The prognoses obtained using ANN and MARS can be used for the appropriate preparation of cows for AI.  相似文献