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crop fields
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  作物田
     The arthropod species from beans crop fields in east of Heilongjiang province were investigated, 70 kinds of arthropod were found, which belonged to 3 classes,11 orders and 40 families.
     根据对密山地区豆类作物田节肢动物种类调查,结果发现豆类作物田节肢动物种类有70种,分别属于3纲,11目,40科。
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     Affinity is a new herbicide developed by American FMC for use in grain crop fields.
     快灭灵40DF是美国FMC公司研制的新型禾谷类作物田除草剂。
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     In the sampled areas of Hebei Province, the residue levels were 5 629.5, 7 369.5 and 2 821.8 g·hm-2 in greenhouse fields, vegetable fields and crop fields, respectively. The average amounts of the film residues in greenhouse fields were in the highest in Heilongjiang Province.
     河北保定、邯郸地区温室大棚、蔬菜田及作物田土壤残留地膜的水平分别为5629.5、7369.5和2821.8g·hm-2,两地区使用农膜地块残留地膜水平显著高于相应对照土壤。
短句来源
     Annuals weed is the main species in each field, the weed community had marked diversity among different crop fields.
     各作物田以一年生杂草为主,不同作物田杂草群落有显著差异。
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     It was shown that "One year one ripe grain fields and cold-tolerant economic crop fields deciduous orchards" is the background for its bigger area in the basin,and other components are surrounded.
     结果表明:“一年一熟作物田及耐寒经济作物田、落叶果树园”在流域中的分布面积最大,是整个流域的基质,其它景观要素镶嵌其中。
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  “crop fields”译为未确定词的双语例句
     The prevalence of EPN in uncultivated soil,orchard,vegetable fields and crop fields were 6.59%,5.13%,3.15% and 2.90%,respectively;
     未耕地以及以果树、蔬菜和大田作物为植被的土壤带线虫率分别为6.59%、5.13%、3.15%和2.9%;
短句来源
     The results showed that soil EC was increased by 2.3 times in secondary saline greenhouse field compared adjacent crop fields; K~+ and NO_3~-were increased by 10.8 times and 8.3 times respectively; Ca~(2+),Mg~(2+),SO_4~(2-) and Cl~ increased by 0.9~1.3 times;
     主要结果为:0~20 cm菜地EC比相邻粮田增加了2.3倍,K+和NO3-分别增加了10.8倍和8.3倍,Ca2+、Mg2+、SO42-、Cl-增加了0.9~1.3倍,HCO3-无显著变化。
短句来源
     Alkali-N, avail-P(Olsen-P), avail-K were increased 17.1, 122.3 and 279.5 mg·kg~ -1 . Avail-Fe, avail-Zn , avail-Mn gave an increase of 9.2, 1.9 and 10.5 mg·kg~ -1 . The change of soil nutrition was significantly different between crop fields and apple orchard.
     碱解氮、速效磷(Olsen-P)、速效钾分别增加了17·1、122·3、279·5mg·kg-1; 有效铁、锌、锰分别增加了9·2、1·9、10·5mg·kg-1,差异均达极显著水平;
短句来源
     Olsen-P, NO_3~--N, alkali-N, avail-K were as 7.4, 7.1, 1.0, 2.6 times as crop fields, in the profile of 0~20 cm cover vegetable fields, respectively;
     Olsen -P、硝态氮、碱解氮和速效钾分别增加了 7 4倍、7 1倍、1 0倍和 2 6倍 ;
短句来源
     Vertical Distribution of in the Soil of Grain Crop Fields Phosphorus and Potassium Nutrients
     粮田土壤磷、钾养分的垂直分布特征
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  相似匹配句对
     SIGNIFICANCE AND METHOD OF STUDIES ON WEED NICHE IN CROP FIELDS
     农田杂草生态位研究的意义及方法探讨
短句来源
     Method and Program for Analysis Weed Niche in Crop Fields
     农田杂草生态位研究方法与计算程序
短句来源
     Crop Design
     作物设计
短句来源
     Unification of fields
     场的统一
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     These fields are of the H.R.
     场具有H . R .
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  crop fields
Site properties could be correlated to weed distribution, since the former vary among crop fields and also certain factors such as soil texture or nitrogen may condition the weed growth.
      
In crop fields, weed density varies spatially in non-random patterns.
      
The guidance system was designed to operate in weedy row crop fields at the time of first cultivation.
      
These included a conventionally managed vineyard (V) and a strip of local wild flowers between crop fields, which was established to promote species diversity in agroecosystems (C).
      
Using the first derivatives of the reflectance curve of crop fields in the range of 0.67-0.74 μm to estimate the leaf area index
      
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In connection with experiments on the control of the rice stem borer, aseries of observations were conducted in 1949 to 1952 in Canton to determinethe form of the distribution of the moth, the egg-mass and the larval popula-tions of this species. It was found that the moth and egg-mass populations inrice seed-beds are in essential agreement with the random distribution of thePoisson series. The larval population in spring-crop fields apparently conformsto the contagious and the negative binomial distributions....

In connection with experiments on the control of the rice stem borer, aseries of observations were conducted in 1949 to 1952 in Canton to determinethe form of the distribution of the moth, the egg-mass and the larval popula-tions of this species. It was found that the moth and egg-mass populations inrice seed-beds are in essential agreement with the random distribution of thePoisson series. The larval population in spring-crop fields apparently conformsto the contagious and the negative binomial distributions. The larval population during hibernation period appears to be neither of the random distribution norof the contagious type but agrees with the negative binomial distribution. The population distribution of the injured stems, characterized by the ap-pearance of "dead-hearts" and "white ears" was also studied. The "dead-hearts"popolation in autumn-crop fields conforms with the contagious and the negativebinomial distribution. The distribution of the "white ears" is not at random. It iseither in essential agreement with the contagious or with the negative binomialdistribution, depending on the size of the sampling unit. Based on the form of population distribution the questions of sampling tech-nique, the design of field experiments, the transformation of data for statisticalanalysis, as well as the habits and control of insects have been discussed inrelation to the rice stem borer. Since the populations of larvae and "whiteears" differ significantly from the random distribution, a new technique forsampling has been proposed. It is hoped that this may be useful in the investi-gations on the relative effectiveness of control operations and for census purposes.

(一)本文就昆虫常见的数种集团分布:潘松分布、核心分布和负二项式分布的公式、性质和例子等略加讨论介绍。 (二)我们在广州附近对三化螟各时期和白穗、枯心苗的田间分布型式作了初步的调查,所得结果如下: 1.螟蛾和卵块在秧田上是随机分布的。 2.幼虫在本田分布不随机,符合核心分布和负二项式分布。 3.白穗在田间的分布不随机,1×1丛、2×2丛、……6×6丛各种取样单位型样本均符合负二项式分布,4×4丛、5×5丛和6×6丛三种取样单位型样本则更符合核心分布。 4.稻遗株内越冬幼虫分布不随机,亦不符合核心分布,但符合负二项式分布。 5.晚造本田枯心苗田间分布不随机,符合核心分布和负二项式分布。 (三)本文就昆虫集团分布型式的调查在实用上的意义,联系到三化螟来讨论,我们论及与虫害调查取样技术、田间试验设计、统计代换方法、昆虫生活习性和害虫防治等各方面的关系;其中取样技术方面,我们举出针对三化螟幼虫在本田和白穗不随机分布的取样新方法的尝试,希望对今后螟害调查工作有所帮助。 (四)最后,我们就一些昆虫分布的特殊问题加以论列,像密度对分布型式的影响,混合集团和环境因素的影响于昆虫集团分布类型等,就中说明了密度过大过 小时了解分...

(一)本文就昆虫常见的数种集团分布:潘松分布、核心分布和负二项式分布的公式、性质和例子等略加讨论介绍。 (二)我们在广州附近对三化螟各时期和白穗、枯心苗的田间分布型式作了初步的调查,所得结果如下: 1.螟蛾和卵块在秧田上是随机分布的。 2.幼虫在本田分布不随机,符合核心分布和负二项式分布。 3.白穗在田间的分布不随机,1×1丛、2×2丛、……6×6丛各种取样单位型样本均符合负二项式分布,4×4丛、5×5丛和6×6丛三种取样单位型样本则更符合核心分布。 4.稻遗株内越冬幼虫分布不随机,亦不符合核心分布,但符合负二项式分布。 5.晚造本田枯心苗田间分布不随机,符合核心分布和负二项式分布。 (三)本文就昆虫集团分布型式的调查在实用上的意义,联系到三化螟来讨论,我们论及与虫害调查取样技术、田间试验设计、统计代换方法、昆虫生活习性和害虫防治等各方面的关系;其中取样技术方面,我们举出针对三化螟幼虫在本田和白穗不随机分布的取样新方法的尝试,希望对今后螟害调查工作有所帮助。 (四)最后,我们就一些昆虫分布的特殊问题加以论列,像密度对分布型式的影响,混合集团和环境因素的影响于昆虫集团分布类型等,就中说明了密度过大过 小时了解分布型式成为不必要的,因为极度的不均衡会回复为均衡状态的。

Soil and water samples were collected from forest stands, tree nurserics,orchards and crop fields in different parts of Yunnan from 1975 to 1976. Gaschromatography analysis was used to detect the residues of BHC and DDTwhich had been frequently applied in these soils.It was found that there wasa positive correlation between the quantity of pesticide used and that of theresidue. Residue accumulated most in areas where the pesticide was used mostintensively. Speed of degradation in soil varies among different...

Soil and water samples were collected from forest stands, tree nurserics,orchards and crop fields in different parts of Yunnan from 1975 to 1976. Gaschromatography analysis was used to detect the residues of BHC and DDTwhich had been frequently applied in these soils.It was found that there wasa positive correlation between the quantity of pesticide used and that of theresidue. Residue accumulated most in areas where the pesticide was used mostintensively. Speed of degradation in soil varies among different isomers of BHC:γ-BHCis the fastest,α-BHC intermediate,and δ-BHC and B-BHC the slowest. If γ-BHC is used as a pesticide to replace the industrial BHC,residue insoil would be reduced by 90%. Residue of pesticides varied with met-hods of application.

本文应用气相色谱法测定施用过农药的森林、苗圃、果园和农田土壤及其附近水体中六六六和DDT的残留量。研究指出,残留量和施药量成正相关,在施用农药较多的地方六六六和DDT的残留量相当高。六六六的各种异构体在土壤中的分解速度不同:丙体分解最快,其次是甲体,丁体和乙体分解缓慢,如果用丙体六六六代替工业六六六作杀虫剂,可以使土壤中的残留量降低90%。本文也表明,农药在土壤中的残留量因施用方法而异。

There are 122 species or other varieties in the rainfed fields in the exploited areas,of which there are 20 species of them may cause serious harm to agricultural production,The harmful value(including relative density, relative dominancy and relative frequency)can be used as an index to evaluate the harmfulness of each weed,There are 68 species of them in the winter wheat fields,of which the harmful value of over 10 are:Phragmites commu- nis Trin;Malcolmia africana(L.)R.Br.;Descurainia sophia(L.)Schur; Vaccaria...

There are 122 species or other varieties in the rainfed fields in the exploited areas,of which there are 20 species of them may cause serious harm to agricultural production,The harmful value(including relative density, relative dominancy and relative frequency)can be used as an index to evaluate the harmfulness of each weed,There are 68 species of them in the winter wheat fields,of which the harmful value of over 10 are:Phragmites commu- nis Trin;Malcolmia africana(L.)R.Br.;Descurainia sophia(L.)Schur; Vaccaria segetalis(Neck.)Garcke;Chenopodium album L.;Rumex denta- tus L.;Calystegia hederacea wall and Galium tricorne Stokes of 8 species. Although the harmful Vicla villosa Roth is only 1.89%,it causes serious harm to part of the crop fields.Attention should be paid to the eradication of Arena fatual with its harmful value of 1.78%,which may also cause harm to some individual crop field.In recent years,though some effective measures have/been taken to eradicate Phragmites communis Trin.in the low-lying lands with a great decrease,it still causes harm to some lands hitherto.Mal- colmia africana(L.)R.Br.spreads most in the sand-soil fields and cau- ses the most serious harm to them.Descurainia sophia(L)schur and Vaccaria segetalis(Neck)Gnrcke may have more serious harmfulness. Galium tricorne stokes may be seen in the irrigated fields in which 2.4—D chemicals were used may become serious so that attention should be paid to the selection of effective chemicals to eradicate them.Rumex dentatus L. spreads more in its young seedling stage with less harm.There are 55 spe- cies of weeds in tpe cooton fields,of which the harmful value of over 10% are:Digitoria sanguinalis(L.)Scop(including Digitaria sanguinalis vor. ciliaris(Retz.)and Digitatria ischoemum(Schreb.)Schreb.ex Muhi.); Eleusine indica(L.)Gaertn.;Echinochloa crusgalli var.mitis(Pursh) peeterm;cypenes rofundus L.and Chloris virgata Swartz.Digitaria san- guinalis(L.)Scop;Eleusine indica(L.)Gaertu and Chenopodium albuml with the harmful value of over 39% occur widely in the crop fields,and also cause serious harm to them.Eragrostis cilianensis(All.)Vig.-Lut.spreads in the sand soil fields and has a serious harmfulness.Solanum nigrum can be seldom seen in the crop fields,bnt the single plant may have a big cast shadow with a serious harmfulness.It is hard to eradicate Cyperus rotundus L.to which attention should be paid. In the winter wheat fields under the similar ecological conditions,the rate of yield reduction of the wheat calculated through measurements by the regression analyses of yields with weeds as coutrast is of practical value.It wao calculated through measurements that the wheat yield was reduced to S. 13—1p.5% because of weed harzards,which affected both of grade for sale and flur quality.Some of the weeds may also affect the progress and quality of harvesting by machines.Cotton in its seedling stage may be seriously affec- ted witp the result that cotton yields and qualities will also be affected. The occurence of weeds in the winter wheat fields may have two peak periods.The prewinser peak period occurs from the mid october to early November.The postwinter peak period occurs in the late March.The wheat fields sown early may have the prewinter peak period,while those sown lato may have the postwinter peak period.The eradication of weeds in the wheat fields should be carried out before the occurence of the peak periods of weeds. The first peak period of the occurence of weeds in the cotton fields may be in May/June,while the second peak period in July/August so that the first peak period of the occurence of weeds in the cotton fields should be taken as the main eradication.

垦区旱田杂草122种(或变种),在生产上危害严重的有20种。

 
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