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ec    
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  乳油
    The trees were seriously damaged during this period. The control efficacy reached over 95% with 2 000× diluted solution of 25% chlorbenzuron and 1.8% abamectin EC and 40% omethoate EC before the third instar.
    用25%灭幼脲,1.8%阿维菌素乳油,40%氧乐果乳油2000倍液防治3龄前幼虫防效达95%以上;
短句来源
    The control efficacy was over 90% with 2 000× diluted solution of 2.5% deltamethrin EC and 3% fenoxycarb EC after the third instar.
    用2.5%溴氰菊酯乳油,3%高渗苯氧威乳油4000倍液喷冠防治3龄后大幼虫防效可达90%以上。
短句来源
    Control Saperda populnea with 16% Chongxianqing EC
    利用16%虫线清乳油防治青杨楔天牛试验初报
短句来源
    Control of Ceroplastes rubens could be made at the initial nymph stage by spraying tree crowns with 437 mg·L -1 and 267 mg·L -1 of omethoate 40 EC or 437 mg·L -1 and 267 mg·L -1 of omethoate buprosezin 35EC,resulting in more than 80% of the nymph being killed.
    结果显示 ,不同处理之间其药效结果差异较大。 在若虫孵化盛期前用 4 0 %氧化乐果乳油 4 37mg·L-1,2 67mg·L-1及 35 %快克乳剂 4 37mg·L-1和 2 67mg·L-1喷雾 ,虫口减退率均达80 %以上 ,用 0 6%阿维菌素乳剂 2 4mg·L-1喷雾效果不理想。
短句来源
    The results showed that 500~1 000 fold omethoate 40EC with 5 mL per worm channel could kill 96%~100% of the larvae.
    结果显示 ,4 0 %氧化乐果乳油 5 0 0~ 1 0 0 0倍液进行防治效果好 ,用药量每虫孔 5mL ,防治效果 96%~ 1 0 0 %。
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  ec
Compounds 2d, 3f, 3a, and 3c exhibited antiviral activity against HSV-1, MAY, and VSV virus with EC50 values of 6.8, 2.2, 4.8, 0.52, 2.5, and 1.0.
      
The half effective concentration EC50 of scavenging hydroxy radicals of compound THDB is 53.1 μmol/L, while that of scavenging hydroxy radicals of compound TTDB is 47.3μmol/L.
      
The remanent polarization (Pr) and coercive electric field (Ec) of the measured PZT thin films are 47.7 μC/cm2 and 18 kV/cm, respectively.
      
Fine mapping of an Arabidopsis thaliana male sterile mutant EC2-157
      
An Arabidopsis thaliana male sterile mutant EC2-157 has been isolated using an EMS mutagenesis strategy.
      
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The technological progress and reform of forest management in recent ten years in the Soviet Union can be seen in the following five respects: 1.In the technological reform of cutting area the link of independent cutoversurvey has been abolished, instead, forest management, resource surveyand delivery of cutovers are conducting simultaneously. Large scale aerialphotographs are used in survey-analytical reading for check and acceptan-ce of cutovers. Software packages for resource material structure of cuto-vers...

The technological progress and reform of forest management in recent ten years in the Soviet Union can be seen in the following five respects: 1.In the technological reform of cutting area the link of independent cutoversurvey has been abolished, instead, forest management, resource surveyand delivery of cutovers are conducting simultaneously. Large scale aerialphotographs are used in survey-analytical reading for check and acceptan-ce of cutovers. Software packages for resource material structure of cuto-vers are developed. 2. Ground survey, indoor reading of large scale aerialphotographs, combination of reading of aerial photographs with ground su-rvey, and photo statistical method are used respectively depending on fo-rest management levels of different forest areas. 3. Establishmentof compartment data base. 4. Development of automated drawing systemof forest management, and the combination of drawing data base with tr-ee measurement data base is under plan. 5. Equipped with the third gene-ration of EC type computers for conducting survey and statistics, analy-sis, tabulation and drawing, this will simplify the complicated work byhalf. In addition, the application of remote sensing technology and thedevelopment of automatic reading system of remotely sensed information willfully automate the process of treatment of remotely sensed information. Thefuture trend of reform are: the small computers will gradually replace theEC type in treatment of forest management information: small scale for-estry resource maps will be drawn on the basis of satellite photographs:further proofs on economic effects should be needed. The paper also pre-sents the systems and tasks of forest management in USSR

本文从5个方面论述了最近10多年来,苏联传统的森林经理工艺的进展与改革:(1)伐区工艺改革(包括伐区拨交与验收);(2)各种森林资源调查方法的研究与使用;(3)全苏小班数据库的建立及自动化检索系统的研制;(4)森林经理制图自动化系统的开发与应用;(5)遥感与电算技术发展迅速。文章还介绍了苏联森林经理技术发展的新动向。

An analysis is made of the forest production and research resultsin all contries, and a comparison is made of the ecology and silviculturaltraits of the man-made and natural forests. It is concluded that naturalforest is better than man-made forest in respect of disease and insect resis-tance, maintenance of soil fertility, sustainable timber production, speciespreservation, and environmental protection. The advantages of man-madeforest are timber evenness, short rotation, fast tree growth, and higher ec-onomic...

An analysis is made of the forest production and research resultsin all contries, and a comparison is made of the ecology and silviculturaltraits of the man-made and natural forests. It is concluded that naturalforest is better than man-made forest in respect of disease and insect resis-tance, maintenance of soil fertility, sustainable timber production, speciespreservation, and environmental protection. The advantages of man-madeforest are timber evenness, short rotation, fast tree growth, and higher ec-onomic returns, but it needs good soil conditions, and must be able to com-pensate for its disadvantage economically. In some cases, man-made forestusually has a shorter regeneration cycle, and can help restore the groundvegetation denuded long ago. Yet low functional diversity is its seriousdefect. Now importance is attached to man-made forest, rather than to na-tural forest. Therefore, a simultaneous development policy is suggested. Invirgin forests selective felling and natural regeneration should be practicedas often as possible, so as to keep landscape, biotic species and genetic di-versity. Secondary forests should be diverted into progressive succession.Common man-made forests should be established in non-stocked forest land,cutover area or burns where natural regeneration cannot meet social demand,or in areas where high quality man-made forest can be well developed asexpected. Relatively, some industrial plantations may be built in areas withgood climate and soils and suitable for intensive forest management. In es-tablishing man-made forests attention should be paid to the combined useof proper tree species.

对人工林和天然林的生态学和林学特性进行了比较和分析。指出天然林对病虫害的抵抗能力强,能持久地生产木材和发挥多重效益,并与很多物种的生存有密切关系。因人工林多样性低,稳定性差,轮伐期短,集约栽培的工业人工林尽管速生,但对地力消耗大,若没有优越的土地条件和额外的施肥,生产力将不能持久。提出我国应实行人工林和天然林并重的方针,要对大量发展工业人工林可能产生的隐患给予重视,要对已保存不多的原始林实行不改变林相的经营方式,避免将它们大面积地改变为人工林的作法。

Diohabda rybakowi Weisa is the pest seriously destroied Nitraria sibirica Pall. in the steppe of west Inner Monglia. Imago and; arva eat the shoots and leaves. the larva's rejectment pollute the branch of the plant, and badly influnce its growth and development. This pest occurs in two generitions annually. Imago lies dormant under the groumd aroumd the roots. Overwintering imago appears on the ground middle in April. It cones to the reign stage between early and middle in May. The larvae of the first generition...

Diohabda rybakowi Weisa is the pest seriously destroied Nitraria sibirica Pall. in the steppe of west Inner Monglia. Imago and; arva eat the shoots and leaves. the larva's rejectment pollute the branch of the plant, and badly influnce its growth and development. This pest occurs in two generitions annually. Imago lies dormant under the groumd aroumd the roots. Overwintering imago appears on the ground middle in April. It cones to the reign stage between early and middle in May. The larvae of the first generition occur and destroy numerously between middle and later in June. The imago of the first generition occuts numerously between early and middle in July. The larvae of the second generition occur between middle and later in August. It is clear that 3 pesticides have the best effect for controlling imago and larva, i.e. compound Rogor 40% EC, Decis 20% EC, and Sachunshuang 50% S. The key stage for controlling the pest are between early and middle in June.

白刺萤叶甲(Di(?)h(?)da r(?)a(?))是内蒙古西部草原植物白刺(Nitraria (?)ca)的生活重要害虫。成虫和幼虫取食其幼芽、嫩叶和叶片,幼虫排出大量粪便污染枝条,严重影响白刺生长发育。该虫一年发生2代,以成虫在白刺根际周围土壤中越冬。越冬代成虫4月下旬开始出土,5月上、中旬为盛期、一代幼虫6月中、下旬大量发生为害,7月上、中旬一代成虫盛发。二代幼虫8月中、下旬大量发生。40%复果乳油、20%速灭杀丁乳油和50%杀虫双水剂对成、幼虫有良好防治效果。5月上旬为越冬代成虫始盛期,6月上、中旬为一代幼虫孵化盛期。目前,对此虫的预报主要是做好田间调查。

 
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