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crop varieties
相关语句
  作物品种
    Study on the Synthetic Decision System for the Resistance of Crop Varieties to Aphid
    作物品种抗蚜性综合决策体系研究
短句来源
    Lots of researching results and productive practice both point out that, for solving disease and/or pest disserving crop production, it is the most essential, most effectual, and most economical method to breed and popularize crop varieties which have the characteristics of resistance to disease and/or pest.
    大量的研究结果以及生产实践业已证明,培育并推广抗病虫作物品种,是解决作物病虫害危害的最根本、最有效和最经济的方法。
短句来源
    Because of these factors such as the variation of strain isolates, the differentiation of pathogenicity, the possible interaction between the host and pathogeny, and the migration of the pest, and their improvement of drug-fast ability, et al, none of the released crop varieties have the durable resistance to disease and/or pest, which is in no favor to the sustainable agricultural development.
    但是,由于病原物生理小种的变异、致病力的变化和寄主与病原物间可能存在的互作、害虫的迁飞及抗药性的增强等原因,导致已经通过作物品种审定的作物抗病虫品种的抗性难以持久,不利于农业的可持续发展。
短句来源
    The insect accumulated survival rate,a new index of insect survival,is proposed in this paper. This new index can not only tell the dynamic change able course of insect survival in various crop varieties,but also contains the age structure and changeable characteristics of insect,as well as the continuous changeable feature of insect in vairous crop varieties.
    提出一新的衡量害虫存活率指标“累积存活率”,该指标不仅能反映害虫在不同作物品种上存活率的动态变化特征,而且将虫态结构及其危害特征纳入其中,能反映出害虫在不同作物品种上的持续危害特征。
短句来源
    The sensitivity to metsulfuro-methyl was tested in 33 crop varieties of 10 families. The results were as follows. (1) Early rice was more sensitive than late rice, normal rice more than hybrid rice.
    通过测定 10科 33个作物品种对甲磺隆敏感性 ,结果表明 :(1)水稻品种的敏感性 ,早稻比晚稻敏感 ,常规稻比杂交稻敏感。
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    Study on Inhibiting Effect of Methsulfuron-methyl on Different Upland Crop Varieties
    甲磺隆对旱作不同品种抑制作用的研究
短句来源
    Marker- assisted selection will facilitate to develop insect resistant crops with polygenic basis, and to introduce valuable insect resistance traits from wild relatives into improved crop varieties in order to increase durability and genetic diversity of insect resistance in the crops.
    标记辅助选择可以加速培育具多基因抗虫性的作物 ,还可以将野生种中的有利抗虫特性转入改良品种中 ,增加作物抗虫性的持久性和遗传多样性。
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  crop varieties
Large-scale implementation of transgenic crop varieties raises concerns about possible nontarget effects on other organisms.
      
The results imply that the foraging success of natural enemies of pests can be enhanced by breeding for crop varieties that release specific volatiles.
      
The results are discussed in the context of the possibility of breeding crop varieties that are particularly attractive to parasitoids.
      
The hypothesis of biological simplification (genetic erosion) is tested with evidence from Andean agriculture, where farmers maintain a significant degree of crop diversity even as they adopt modern crop varieties.
      
Accumulation of metals (Cu, Fe, Mn, Cd, Cr and Pb) was estimated in the root, shoot and edible parts of different crop varieties grown in pot culture up to maturity and treated with industrial effluent.
      
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1. Under different initial population densities, but under the same temperature, all population curves are similar. Only they differ in their levels.Under different temperatures, but under the same initial population density, the population curves rise much more steeply under higher temperatures.2. When comparing temperature with initial population density, temperature has much more influence on population developments.3. Within the whole range of simulated temperatures, if only the initial population density...

1. Under different initial population densities, but under the same temperature, all population curves are similar. Only they differ in their levels.Under different temperatures, but under the same initial population density, the population curves rise much more steeply under higher temperatures.2. When comparing temperature with initial population density, temperature has much more influence on population developments.3. Within the whole range of simulated temperatures, if only the initial population density can be well controlled, the whole growing season can be free of applying insecticides. Thus, breeding of "clean seedlings" and appropriate cultivation of crop varieties is the basis and clue of biological, chemical and integrated control of greenhouse whiteflies.4. Under medium infestations, one spraying cf pyrethrin or DDVP is sufficient, but costs more than smoking methods do because of more labour costs. Smoked DDVP costs less but one more application is required.5. Under heavy infestations, spraying of pyrethrin can have the least number of application, the lowest cost and the least number of application within the fruit gathering period. Advanced spraying (if only once) have no significant effect.

在系统调查的基础上,利用已有的种群动态的模拟模型,本文探讨了在可能的不同温度、不同初始种群密度的各组合下温室白粉虱(Trialeurodes vaporariorum)种群的动态及发生程度。 我国当前对温室白粉虱的防治手段仍以化学防治为主。本文也探讨了当必须防治时,如何最优地选择农药品种和施用方式以使打药次数最少、残留相对地最少和相对地最经济。从结果看,在模拟的温度参数范围内,只要很好地控制住初始种群密度,整个生长期中可以不用防治。因此,培育“清洁苗”,合理地选择作物品种(不易受侵染者)是进行化学防治以至生物防治和综合防治的关键。本文也给出了对中等发生和严重发生时采取不同防治策略的两个例子。

An investigation on soil-borne wheat mosaic virus which has been anepidemic disease since 1974 in Yantai prefecture was conduefed. The results were as follows: The host crops of soil-borne wheat mosaic virus were wheat barley and rye, which plants were infected in autumn shoot stage until the reviving stage the disease symptom appeared. The symptom was divided into two stages of yellow and mosaic leaves. The dissemination ways of the disease were the pathogenic soil. Virus plasmid was mainly straight stick shape...

An investigation on soil-borne wheat mosaic virus which has been anepidemic disease since 1974 in Yantai prefecture was conduefed. The results were as follows: The host crops of soil-borne wheat mosaic virus were wheat barley and rye, which plants were infected in autumn shoot stage until the reviving stage the disease symptom appeared. The symptom was divided into two stages of yellow and mosaic leaves. The dissemination ways of the disease were the pathogenic soil. Virus plasmid was mainly straight stick shape with the length of 30~360nm (60~140nm in epidemic peaks), the diameter of 12~20 nm and an apparent hollow structure. The disease invasion was related with crop varieties, soil type and soil fertility. The disease could be controlled by taking comprehensive prevention and cure measure of agricultural cultivation in which the disease resistant and tolerent varieties should be mainly utilized.

对烟台地区从1974年流行起来的土传小麦花叶病进行了调查研究。寄主作物为小麦、大麦和黑麦。麦株是在秋苗期被侵染,至返青时才显现症状,病症分黄叶和花叶两个发展阶段。传播途径为病土。病毒质粒主要为直棒状,有明显的空心结构,其长度在60~360nm(高峰在60~140nm),直径为12~20nm。发病与品种、土质、肥力等因素有关。采取“以抗、耐病品种为主的农业栽培综合防治措施”,可控制危害。

Species and population of the natural enemies were investigated in cottonfields and the adjacent paddy fields.The result showed that in the early stage of rice growth,the transitions of the natural enemies between cotton. fields and rice fields maintained dynam-ic equilibrium. As the rice grows mature ,the natural enemies immigrated into cotton fieldsand weeds from rice fields. Therefore ,crop varieties should be properly arranged in order tosupply the natural enemies with transitional habitat ,which...

Species and population of the natural enemies were investigated in cottonfields and the adjacent paddy fields.The result showed that in the early stage of rice growth,the transitions of the natural enemies between cotton. fields and rice fields maintained dynam-ic equilibrium. As the rice grows mature ,the natural enemies immigrated into cotton fieldsand weeds from rice fields. Therefore ,crop varieties should be properly arranged in order tosupply the natural enemies with transitional habitat ,which led to less population decrease ofnatural enemies.

对相邻的棉田和稻田天敌种类及数量调查结果表明,在水稻生长前期,天敌在棉、稻作物间转移处于动态平衡状态。当水稻成熟时,天敌大量由稻田转向棉田和田边杂草。因此,应合理安排作物布局,为天敌提供“桥梁田”,减少天敌损失量。

 
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