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weeds
相关语句
  杂草
    The Study on Weeds Population in Desolation Lawn Encounter Incidence, and the Relationship to Density (D), Coverage (C) and Frequency (F)
    荒芜草坪杂草种群种间相遇机率(PIE)及密度(D)盖度(C)频度(F)的相关性研究
短句来源
    ⑤bush and weeds overgrow.
    ⑤不除灌木杂草,使其与板栗争光争肥。
短句来源
    The investigation showed that there were 19 species of insect pests,18species of natural enemies and 15 species of weeds which usually orcured in pear orchard.
    调查表明:梨园常发害虫有19种、天敌18种、杂草15种。
短句来源
    Field investigation showed there was few weeds in their community.
    植被调查表明其群落中杂草很少,形成蟛蜞菊纯群落。
短句来源
    Dicotyledou weeds were treated with 72% 2,4-D butylate at 0.75kg/hm 2~0.98 kg/hm 2 or with 72% MCPA——Na at 1.50kg/hm 2.That made the control efficiency to 86.2%~96.9%;
    防除草坪中双子叶杂草用72%的2,4-D丁酯0.75~0.98kg/hm2或72%的2甲4氯1.5kg/hm2,株防效为86.2%~96.9%;
短句来源
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  “weeds”译为未确定词的双语例句
    INVESTIGATION ON TURFGRASS DISEASES,PESTS AND WEEDS IN SHANGHAI
    上海草坪病、虫、草害的调查
短句来源
    In yield-increasing effect, living green manure ranks first, with28.6% of yield increase, then come straw and wood residual, 18.6% and17.9%, respectively,and weeds come last, with only 6.4% of increase.
    麦秆、木渣次之、增产18.6%和17.9%;
短句来源
    The results of chemical weeding in the lawn nursery of Zoysia matrella showed that benthiocard 50EC applied in solution at the rate of 3 24 L per 525 kg per hectare or Goal 23 5EC 1 24 L per 525 kg per hectare had a great control relult for weeds,with efficiency of 97 0% and 98 8%,and maked a reduction of 93 45% and 93 19% in the costs respectively Meanwhile,the lawn grew well
    在马尼拉草坪苗圃用50%杀草丹乳油3.24L·hm-2加水525kg或23.5%果尔乳油1.24L·hm-2加水525kg喷雾,除草率分别达97.0%和98.8%,节省除草成本93.45%和93.19%。 草坪生长良好
短句来源
    Investigation on Orchard Weeds and Studies on Their Utilization Value
    果园空地野草资源及其利用价值的调查
短句来源
    Evaluation of adaptability, diseases and weeds of introduced turfgrass varieties
    引种草坪草的适应性评价及病害和草害
短句来源
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  weeds
canadensis including length, surface area, volume, and average diameter are greater than for composite exotic weeds.
      
Information on specific features of distribution and activity of introduced species growing feral and accidental weeds in different forest types is presented.
      
Cultivated plants and weeds in fields of the Penza Volga region in the middle ages
      
Geobotanical investigations demonstrated that the transformation of the species composition of herbs from weeds to predominantly meadow plants occurred in five-ten years after the soil was no more used for farming.
      
The algorithm separates the weed area from soil background according to the color eigenvalue, which is obtained by analyzing the color difference between the weeds and background in three color spaces RGB, rgb and HSI.
      
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It was reported earlier by the authors that the mosaic disease of the crucifer-ous vegetables was mostly caused by two strains of turnip mosaic virus(TrMV),i.e.“turnip strain”(commonly called turnip mosaic virus)and“rape strain“(commonly called rape mosaic virus).Field surveys made in the past 11 years(especially those made in 1956-1958)revealed that the virus oversummered main-ly in the summer grown cruciferous vegetables,including Pak-Tsai(Brassicachinensis Linn.),Tsai-Shen(B.spp.)and water-cress(Nasturtium...

It was reported earlier by the authors that the mosaic disease of the crucifer-ous vegetables was mostly caused by two strains of turnip mosaic virus(TrMV),i.e.“turnip strain”(commonly called turnip mosaic virus)and“rape strain“(commonly called rape mosaic virus).Field surveys made in the past 11 years(especially those made in 1956-1958)revealed that the virus oversummered main-ly in the summer grown cruciferous vegetables,including Pak-Tsai(Brassicachinensis Linn.),Tsai-Shen(B.spp.)and water-cress(Nasturtium officinariumWall.).The cruciferous weeds including Nasturtium montanum Wall.(only 2plants found naturally infected in 11 years)and Capsella bursa-pastoris Medic.(only 1 plant found naturally infected in 11 years)were not important as over-summering hosts.The results of the transmission tests showed that the two strains of TrMVwere readily transmitted by false cabbage aphid(Rhopalosiphum pseudobrassicaeDay.)and peach aphid(Myzus persicae Sulz.),less so by red mite(Tetranychustelaxius Linn.),and not transmitted by the adults of striped flea-beetle(Phyllotrata vittata Fab.)and the larvae of army-worm(Prodenia litura Fab.)and white-fly(Pierie rapae Linn.). They were not transmitted by seeds of thehost and by the dodder plant(Cuscutus chinensis Linn.).Soil mixed with freshresidue of diseased plant might cause occasional infection of replanted plants,but did not cause any infection of plants that were grown up from seeds sown inthe infested soil.According to the field surveys made in July 1956 to June 1958(once in every10 days),the false brassica aphid was the most important vector in Canton,in-festing the cruciferous vegetables all the year round,while the peach aphidappeared only occasionally in March and April.On ground of the field infectionpercentages,the aphid's populations,and the climatic conditions in every 10 days'period in these 24 months,it was found that the epiphytotic of the disease inCanton was closely related to the aphid population that occurred about 10-20days earlier,and the aphid population was again closely related to the amount ofrainfall and the number of rainy days in the past 10-20 days.It was thereforeconsidered possible that on ground of the prevailing condition of rainfall,onewas able to forecast the epiphytotic of the disease about 30 days ahead.

广州地区十字花科蔬菜花叶病(主要病毒是芜菁花叶病毒的油菜毒系和芜菁毒系)的越夏寄主,根据11年来的观察特别是1956—1958年间的实地调查结果,主要是小白菜、菜心和西洋菜。在野生植物中曾发现过2株蔊菜和1株荠菜自然感病,说明野生植物不是本病的重要毒源。室内试验结果证明,此病的自然传染媒介为萝卜蚜、桃蚜和普通红蜘蛛。黄条跳(虫甲)、斜纹夜盗蛾和菜粉蝶都不是本病的虫媒,病株的种子不会传病,中国菟丝子也不会传递本病。在带有未腐熟的病菜残体的土里进行直播,长出来的菜苗没有发病的;但是把菜苗移植在这样的土里,会有极小量的植株感病。根据1956年7月至1958年6月,每十日田间调查一次结果:萝卜蚜是广州地区最重要的传病媒介,桃蚜每年只在3—4月间略有发生,作用不大。根据这24个月的田间发病率,萝卜蚜(有翅蚜及无翅蚜)的虫口密度和气候情况,我们认为本地区本病的发生及流行程度主要受降水量和降水天数所影响,并认为可以从降水情况来预测约30日后的病害流行程度。

The virus isolates of Rorippa montana (Wall.) Small, Plantago depressa Willd and Rehmannia glutinosa Libosch etc., in the region of Huitian, Honan are grouped into three types. Types Ⅰ and Ⅱ isolated from Rorippa montana (Wall.) Small and Plantago depressa Willd are strains of the Turnip Mosaic virus. Type Ⅲ isolated from Rehmannia glutinosa Libosch is a strain of the Tobacco Mosaic virus (TMV). Type Ⅰ is identical to the virus strain usually isolated from the Chinese cabbage. It is considered that Rorippa montana...

The virus isolates of Rorippa montana (Wall.) Small, Plantago depressa Willd and Rehmannia glutinosa Libosch etc., in the region of Huitian, Honan are grouped into three types. Types Ⅰ and Ⅱ isolated from Rorippa montana (Wall.) Small and Plantago depressa Willd are strains of the Turnip Mosaic virus. Type Ⅲ isolated from Rehmannia glutinosa Libosch is a strain of the Tobacco Mosaic virus (TMV). Type Ⅰ is identical to the virus strain usually isolated from the Chinese cabbage. It is considered that Rorippa montana (Wall.) Small and Plantago depressa Willd. are the important sources of the viruses which infect the autumn grown Chinese radish and Chinese cabbage. Since no cruciferons crops in this region are grown in the warm season, it is evident that these two weed hosts serve for the viruses to tide over summer.

从1963年开始,調查了河南新乡輝县地区可以越夏的主要野生植物,如蔊茶(Rorippa montana(Wall.)Small)、車前(Plantago depressa Willd.)、地黃(Rehmannia glutinosa Libosch.)等上的花叶病,并經过寄主反应、抗性鑑定試驗証明:蔊菜花叶_10-(31-5、28-10)-10,車前花叶_3,地黄花叶_7的分离物中,可分为三个类型,其中Ⅰ型病毒:致死温度50—60℃,稀释終点1:2,000—6,000;Ⅱ型病毒:致死温度60℃,稀释終点1:2,000;Ⅲ型病毒:致死温度90℃,稀释終点1:100,000—1,000,000。以上分离物可由桃蚜、蘿卜蚜传染到白菜上。其中Ⅰ型病毒与当地白菜病毒分离物(对照)的性状是一致的,因此認为,蔊菜、車前等野生植物为当地白菜病毒的重要越夏寄主。

Mixture of Propanil and Sevin ( "DCPA.NAC" ) in proper propor-lions ise weed killers with high selectivity on citrus fruits.

敌稗、西维因混剂是用不同比例的敌稗与西维因选配成的对柑桔类果树有高度选择性的除草剂。每亩施用敌稗0.4斤加西维因0.05斤,其杀草效力很强,对柑桔的叶片和根系都较安全。叶面喷洒的除草效果较土壤处理的好。 叶面喷洒后10天内,日平均温度22℃以上,能杀死大多数一年生杂草,其除草率达90%左右,抑草期长达45~60天;日均温18℃以下,效果稍差,抑草期约30~35天。 一年中在低温期(4~5月)使用草甘膦或敌草隆或除草剂1号一次;在高温期(6~7月)使用敌稗西维因混剂一次的除草效果,可相当于一般柑桔园全年人工除草5~6次的除草水平,这样可省工70%左右,费用亦省50%以上。

 
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