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population     
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  种群
    Application of Weibull Distribution Function and Rayleigh Density Function in Established Forecast Model of BPH Population Fluctuation
    Weibull分布函数和Rayleigh密度函数在组建褐飞虱种群预测模型中的应用
短句来源
    A Prediction System for Population Dynamics of Cotton Pink Bollworm Based on Knowledge Base
    一个基于知识库的棉红铃虫种群动态预测系统
短句来源
    A STUDY ON THE SHOOT NUMBER CHANGING OF STIPA BREVIFLORA AND THE RALATIONS WITH ITS POPULATION YIELD
    短花针茅(Stipa breviflora)枝条数消长及其与种群产量关系的研究
短句来源
    Simulation and Application of Mathematics on Growth of Stipa breviflora Population
    短花针茅种群生长特性的数学模拟和应用
短句来源
    The Spatial Distribution Pattorns of two Levels of Population Structure in Kobresia humilis
    矮嵩草两种群结构水平的空间分布
短句来源
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  群体
    Rice (Oryza Sativa L.) DH PoPulation Construction and SSRs Markers Analysis
    水稻DH群体的构建与微卫星标记分析
短句来源
    Genetic Dissection on the Basis of Heterosis Using an "Immortalized F_2" Population
    汕优63“永久F_2”群体构建及其杂种优势的遗传研究
短句来源
    Study on Source-Sink Characteristics of Population and Their Influencing Factors in Rice
    水稻群体源库特征及影响因素研究
短句来源
    Structure and Function of Population Photosynthetic Source in Winter Wheat under the Water-saving and High-yielding Cultivation Condition
    冬小麦节水高产栽培群体源性能特征及其调控机制
短句来源
    Population Quality Indices of High Yield and Cultivated Approach in Maize
    玉米高产群体质量指标及其调控途径
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  居群
    A wild hexaploid population of Corydalis yanhusuo from Zhejiang
    浙江发现野生延胡索六倍体居群
短句来源
    Sampling Strategy Within a Wild Soybean Population Based on Its Genetic Variation Detected by ISSR Markers
    利用ISSR标记研究野大豆居群内遗传变异及其取样策略(英文)
短句来源
    Studies on Characteristics of rDNA ITS Sequences and Population Authentication of Alisma orientale
    泽泻rDNA ITS区序列特征及其居群鉴别研究
短句来源
    RAPD Analysis on Genetic Diversity of Wild Population of Lespedeza Michx.
    胡枝子属植物野生居群遗传多样性RAPD分析
短句来源
    Studies on population difference of Dendrobium officinale Ⅱestablishment and optimization of the method of ISSR fingerprinting marker
    铁皮石斛居群差异的研究ⅡISSR指纹标记方法的建立与优化
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  总体
    Judging by the 95% confidence range of the population average per mu yield,typical sampling is more accurate than random sampling.
    从亩产总体平均值95%的置信范围看,典型众数抽样亦较之随机抽样为精确。
短句来源
    Of which the population effect of Ningchun 14 intercropping with the 4 maize cultivars was greater than that of interplanting Ningchun 16 with the 4, the population effect of intercropping Ningchun 4 with the 4 was the smallest, Yiedan 13 achieved the highest yield in the trial, Ningdan 7 came to the second and Zhongdan 2 the last.
    其中,宁春14号与4个玉米品种配套总体效应大于宁春16号,宁春4号最差,掖单13号产量最高,宁单7号次之,中单2号最差。
短句来源
    Random samples with different capacities of 5 traits in 4 cross-combinations were taken out to make comparison of the averages and variances of samples with those of the population composed of 240 seedlings,and to indicate that at least 170 seedlings were used to reflect the population average and variances in all 5 investigated traits at the level of α=5%and K=10%on the basis of incredible regions.
    通过抽取4个组合5个性状(株高、茎径、茎数、锤度和丛重)不同容量的随机样本,比较其统计平均数和方差与240株所构成的总体平均数和方差的差异.以置信区间为基础,估算α=5%,K=10%的水平下,至少需要170株实生苗的样本容量才能较准确地反映出所有性状的平均数和方差.
短句来源
    The results were as follows: 1) the average germination ratio of the population is 78.17%, the ratios of cigar, flue_cured and (burley) tobacco are 87.24%, 86.24% and 76.43%, respectively, the difference is extremely significant;
    结果表明:①各烟草类型种质的总体平均发芽率为78 17%,烟草类型间以雪茄烟最高为87 24%; 其次是烤烟,为86 24%;
短句来源
    For all germplasms,the percentage of polymorphic loci (P) was 66.7%,and Nei's gene diversity index (Ht) was 0.2099.The number of P and Ht among cultivation germplasn were AT>AB>NC>SZ,which of each germplasm of wild and genetic materials were small,but of the population were still big.
    所有种质的多态性位点比率(P)为66.67%,Nei's基因多样性指数Ht为0.2099,栽培种质的Ht和P值AT>AB>NC>SZ,野生和遗传材料中各份种质的Ht和P值很低,但总体值仍高;
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      population
    On the differentiability of the parity progressive population semigroup
          
    We are concerned with the differentiability of the parity progressive population semigroup under certain weak assumptions.
          
    We prove by studying the properties of the spectrum of the parity progressive operator of population that there existst0>amp;gt;0 such that the parity progressive population semigroup {T(t): t≥0} is differentiable ift>amp;gt;t0
          
    In this paper, we present a simple and direct approach in which supermartinagles are used to approximate the optimal stopping sets associated with the Bayesian sequential test for normal population means.
          
    For von Mises population M(μ,k), we find that six bootstrap confidence intervals are second-order correct like the approximate normal confidence interval, and STUD-interval is third-order correct.
          
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    1.Evenness as commonly referred to stand regularities and variability of plant charactersis a problem of some practical significance.Irregularities caused by imperfect germination,planting defect,non-uniformity of seed size are commonly met in ordinary field conditions. The problem has been studied in detail by Engledow and others (6-20).For plant withtillering ability as rice,the question of evenness is more complicated in that the side tillerswhich are consecutively given out,and thus vary greatly in size...

    1.Evenness as commonly referred to stand regularities and variability of plant charactersis a problem of some practical significance.Irregularities caused by imperfect germination,planting defect,non-uniformity of seed size are commonly met in ordinary field conditions. The problem has been studied in detail by Engledow and others (6-20).For plant withtillering ability as rice,the question of evenness is more complicated in that the side tillerswhich are consecutively given out,and thus vary greatly in size can develop as independentunits.The present study was undertaken to determine the effect of tillering on the evennessof rice plants of different field densities in the course of development.2.Evenness of any plant character is expressed in terms of a coefficient (C.E.) i.e.x/Sx which is the reciprocal of coefficient of variability (C.V.).The larger the C.E.,thehigher is the evenness.All the observations were made on per tiller basis.From the systema-tic records,however,the evenness at other levels,such as per main shoot,per plant or perhill can be easily calculated.3.At the seedling stage,when no tiller has yet been formed,the C.E.of the denselyplanted plot is higher than that of the sparsely planted plot;at the harvesting stage,thesituation is reversed (Tab.1,2 & Fig.1).The abundancy of tillers and the high degree ofevenness at harvesting stage are always parallel phenomenon,since both are results of favor-able environment conditions under which the plants grow.Dressing at late-tillering stage hasa positive effect on evenness.4.The C.E.of the tiller height varies with developmental stages.In spite of thedifferent planting densities and dressing regimes,the general trend of change is similar.Atthe seedling stage,all tillers (main shoots) are normally distributed about a mean height,thedegree of variability being moderate.At the shooting stage,the C.E.falls to a low valueand the distribution curve becomes skewed and may show two maxima.This change is dueprimarily to the consecutive formation of new tillers on the one hand and the rapid elongation ofolder tillers on the other.The change of C.E.from low to high value from the boltingstage onward is apparently due to two causes:namely,the higher growth rate of the smalltillers over that of the older ones (Tab.4,5 & Fig.2),and the dying off of the very smalltillers (Tab.3).5.In the densely planted plot,the degree of evenness does not show so much changewhen the C.E.'s at the seedling stage and harvesting stage are compared.In such a plot therelative growth rate of the small tillers may never surpass that of the large ones.It isplausible to infer that this failure is due mainly to the shortage of food material necessaryfor rapid growth,as the smaller tillers in a dense plot are severely shaded.6.The rate of height increase of a particular tiller is a function of its own height,thedevelopmental stage and the environmental conditions some of which are affected by the heightdistribution of the surrounding plants.Death of tillers is also dependent on height distribu-tion (Fig.3),none of those which does not elongate at the proper shooting stage becomesfertile.7.Since the tiller weight varies with the cube of the tiller height (Tab.6 & Fig.4),and the panicle weight and number of spikelets are linearly correlated with tiller weight(Tab.10),the C.E.'s of tiller weight,panicle weight and number of spikelets are alwayslower than that of the tiller height.The difference is usually 4-5 folds (Tab.7 & 8).There-fore,relative high evenness in plant height does not necessarily imply high C.E.'s in tillerweight or other panicle characters.8.In fields of ordinary densities,the panicle weight is linearly correlated with the tillerweight.If the total dry weight of the population and the average tiller weight are equal,the degree of dispersion of tiller weight will pratically not affect the final grain yield.

    本文通过试验资料分析了稻田整齐度的变化规律。各时期整齐度的高低与分蘖消长及大小蘖生长速度的快慢有密切的关系。在不同密肥条件下,整齐度变化的总趋势均是趋于提高,但稀植多肥的情况下提高较多。文中并用统计方法分析了各项生长指标的整齐度之间的关系,以及整齐度对产量的影响等。

    Eight F_2 populations of winter wheat hybrids and their parents were space-planted inrandomized blocks with two replications.Heritabilities (in the broad sense) of nine characters,namely,date of heading,plant height,ear length,number of fruiting spikelets per ear,earsper plant,seeds per ear,seed wears per ear,seed weight,and yield per plant were calculatedas the percentage of genotypic variance of phenotypic variance.Date of heading gave the highest heritability,72.04%,and ears per plant the lowest,25.57%.Ear...

    Eight F_2 populations of winter wheat hybrids and their parents were space-planted inrandomized blocks with two replications.Heritabilities (in the broad sense) of nine characters,namely,date of heading,plant height,ear length,number of fruiting spikelets per ear,earsper plant,seeds per ear,seed wears per ear,seed weight,and yield per plant were calculatedas the percentage of genotypic variance of phenotypic variance.Date of heading gave the highest heritability,72.04%,and ears per plant the lowest,25.57%.Ear length,plant height,and seed weight Showed moderately high heritabilities of 69.21%,66.45%,and 57.55% respec-tively.The heritabilities of the remaining characters were relatively low.The productivityof various crosses was estimated according to the method proposed by Kan-Ichi Sakai.The estimates of heritability would give a higher error,if one of the parents of a certaincross was quite unadapted to the local environments;and they would increase proportionallyto a certain extent to the mean difference of two parents which were suitable to the localenvironments.Using the squares of coefficient of variability instead of the correspondingvariances would give some adjustment to the estimation of heritabilities.

    本试验采用遗传变量和表现型变量的比值来估算性状的广义遗传力。估算结果以抽穗期的遗传力最高,达72.04%,一株穗数最低,仅25.57%。穗长、株高、千粒重的遗传力分别为69.21%,66.45%和57.55%。其他性状的遗传力则较低。根据遗传力的估值,对各组合的生产力进行了鉴定。试验指出双亲之一如对当地环境条件很不适应,则遗传力误差很大。双亲如均能适应当地环境条件,则遗传力又可能随双亲的差距而递增。利用变异系数的平方代替相应的变量来估算广义遗传力可以起到一定的矫正作用。

    An analysis of the components of variations and the estimation of four genetic para-meters,namely heritability,genetic correlation,genetic advance and selection index,in F_2population and F_3 progenies of six crosses between varieties of different ecolog cal type ofkeng rice,were made at the Institute Farm,Peking in 1962-1963.1.The heritabilities of important economic characters of rice as estimated from 4 differentmethods (heritability in the broad sense,regression of offsprings on parents,correlation...

    An analysis of the components of variations and the estimation of four genetic para-meters,namely heritability,genetic correlation,genetic advance and selection index,in F_2population and F_3 progenies of six crosses between varieties of different ecolog cal type ofkeng rice,were made at the Institute Farm,Peking in 1962-1963.1.The heritabilities of important economic characters of rice as estimated from 4 differentmethods (heritability in the broad sense,regression of offsprings on parents,correlation be-tween them and variance analysis) showed a uniform tendency with the exception of grainsper ear and 200-grain weight.The heritability of heading days was the highest,those ofplant height and ear length ranked next,while those of sterility,ears per plant and ear weightper plant were among the lowest.2.Phenotypic,genotypic and environmental correlations among characters were calculated.In all instances,genotypic correlations were higher than the corresponding phenotypic corréla-tions,and both were of the same direction.The degrees of correlation between charactersvaried with different crosses.Thus,in Kwang-Fu No.1 & Foji-Saka No.5,correlations be-tween yield (ear weight per plant) and other characters were comparatively low;while with853 & Norin No.20,there were high geotypic correlations between yield on the one hand andheading days,plant height,ear length on the other hand.3.By selecting the 5% top or bottom performing F_3 progenies,the expected genetic pro-gress and its relative efficiency for plant height were the heighest in the cross Bih-Chieh 800granis & Norin No.20,being 17.88 cm.and -14.7% respectively;those of sterility were thehighest in Shui-Yuan 300 grain & Ping-Shah native variety,being -6.81 and -33.82% respec-tively.In the cross of 853 & Norin No.20,both genetic advance and its relative efficiencywere high for heading days,200-grain weight and yield (ear weight per plant).4.Selection of one character in hybrid population would simultaneously affect the geneticprogress of other characters.For example,through a 5% selection toward shortness for plantheight in Kwang-Fu No.1 & Foji-Soka No.5,the selected progenies showed earlier in ma-turity,had less grains per ear.5.A number of selection indexes were formulated.Using data on yield components;i.e.grains per ear,200-grain weight and ears per plant,the reliability of the expected geneticprogress in yield was 42% higher than that from straight selection for ear weight per plant.If the index was worked out on the basis of grains per ear and 200-grain weight,the relativeefficiency was 14% higher than on yield alone.Selection scores calculated from the most effec-tive selection index was used to evaluate the relative performance of superior progenies insome crosses.6.Experimental results revealed that the four genetic parameters mentioned above,wereeffective means for increasing the effectiveness of selection in the breeding programme of rice.

    水稻性状遗传力的位次,在不同估算方法(广义法、迴归及相关法、变量分析法)间,除一穗粒数、粒重有出入外,其它几个性状都有一致的趋势,即抽穗日数最高,株高、穗长次之,空壳率、穗数及穗重最低。性状间的相关程度因组合而异,遗传相关一般高于表现型相关,两者的正负方向大体相同。性状遗传进度的大小决定于遗传力及遗传变异幅度,在5%选择强度下,性状的遗传进度,组合间有显著的差异。性状遗传进度间的相关表明,向矮稈选择时,后代会引起早熟、一穗粒数减少等现象。选择指数的效果因其构成而不同,应用具有较高效率的选择指数,分别算出各系统的综合评价点数,以判断系统的丰产价值。

     
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