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cultivar regional test
相关语句
  品种区域试验
     A STUDY ON THE MAIN SELECTION INDEX AND ITS PARAMETERS IN CULTIVAR REGIONAL TEST
     品种区域试验主要决选指标及其参数的研究——Ⅰ.丰产性
短句来源
     A STUDY ON THE LOCATIONS OF WHEAT CULTIVAR REGIONAL TEST IN THE LOWER YANGTSE VALLEY
     长江下游地区小麦品种区域试验布点问题的探讨
短句来源
     The data on the yield, number of grains per spike and weight of 1,000 kernels obtained from Wheat cultivar regional test in the Lower Yangtse Valley were used to group locations according to the similarity of genotype ×location effects by cluster analysis.
     应用长江下游地区小麦品种区域试验1979—1983年4个小麦生长季的产量、每穗粒数和千粒重资料,分别按其基因型×地点效应的相似性进行聚类分析。
短句来源
  “cultivar regional test”译为未确定词的双语例句
     The Principle and Method of Analysis of Similarity-diffrence Connection Trend for Cultivar Regional Test in Cotton
     棉花品种区试的同异联系势分析原理与方法
短句来源
     Muilt-check Design and Superiority Measure in Cultivar Regional Test
     区域试验的多对照设置和品种的优度估计
短句来源
     Some suggestions were put forward regarding future research directions on reproductive biology,cultivar regional test,cultivar genetic analysis,enzyme metabolism during the process of flower bud differentiation,the effect of extrinsic hormones and chemicals on flower bud differentiation,pollen characteristics,pollination and fertilization,and the physiological mechanism of self-incompatibility.
     对今后进行扁桃生殖生物学特性研究提出了针对开花坐果特性,进行现有优良品种的区域化研究、加快不同品种生殖特性遗传分析研究、扁桃花芽分化过程中酶代谢规律及其外源激素和药物对其花芽分化的影响的研究、不同品种花粉性状及其授粉结实特性筛选各地适宜的授粉昆虫的研究、受精生理学研究的方向和建议。
短句来源
     In term of the principle of golden section,the comprehensive similarity degree was divided into 5 types. Hereby,various varieties were evaluated. Compared with fuzzy comprehensive evaluation and grey multi-dimension comprehensive evaluation method,this method had many advantages such as simple operation,easy control,obtaining more indifferently,considering many characters comprehensively and analyzing the data in cultivar regional test more indifferently etc.
     与此同时,将此法与模糊综合评判、灰色多维综合评估法进行了比较,认为该方法具有运算简便,容易掌握,获取信息量大等优点,能够同时考虑多个性状,更客观、综合分析区试数据。
短句来源
  相似匹配句对
     Muilt-check Design and Superiority Measure in Cultivar Regional Test
     区域试验的多对照设置和品种的优度估计
短句来源
     Test
     测试
短句来源
     In Test
     iM测试
短句来源
     A STUDY ON THE MAIN SELECTION INDEX AND ITS PARAMETERS IN CULTIVAR REGIONAL TEST
     品种区域试验主要决选指标及其参数的研究——Ⅰ.丰产性
短句来源
     Regional Test of Hybrid Rape
     杂交油菜区域试验
短句来源
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The data on the yield, number of grains per spike and weight of 1,000 kernels obtained from Wheat cultivar regional test in the Lower Yangtse Valley were used to group locations according to the similarity of genotype ×location effects by cluster analysis. Six or seven genotypes of wheat were planted in thirteen locations from 1979 to 1983 for four crop seasons. Distance coefficients(Euclidean distance)were estimated among all possible pairs of locations. Such an analysis would be useful for the selection...

The data on the yield, number of grains per spike and weight of 1,000 kernels obtained from Wheat cultivar regional test in the Lower Yangtse Valley were used to group locations according to the similarity of genotype ×location effects by cluster analysis. Six or seven genotypes of wheat were planted in thirteen locations from 1979 to 1983 for four crop seasons. Distance coefficients(Euclidean distance)were estimated among all possible pairs of locations. Such an analysis would be useful for the selection of testing sites for early generation testing and for development of genotypes with wide or narrow adaptability.The weight of 1,000 kernels of check cultivar was the best data to group locations. The 13 locations were grouped into 10 clusters with respect to their Weight of 1,000 kernels of check cultivar distance in a 4-dimensional space (4 years).The groups were as follows:A.East to the Grand Canala.Eastern plain1. Suzhou, 2. Nantong(Rudong)b.Law ground of riverside3. Wujin, 4. Changshu, 5. Xinghuac. Seaboard sandy soil region6. Yancheng and DafengB.West to the Grand Canald. High sandy region7. Yangzhoue. Downland8. Zhenjiang and Yizheng, 9. Nanjingf. Side of River and Lake(Hongze Lake)10. Jinhu and Jiangpu.

应用长江下游地区小麦品种区域试验1979—1983年4个小麦生长季的产量、每穗粒数和千粒重资料,分别按其基因型×地点效应的相似性进行聚类分析。6—7个小麦材料种在13个试点。计算各试点间所有可能成对的78个欧氏距离系数。此种分析有助于为选择确当试验地点以研究早期世代和品种适应性的宽窄提供参考。结果表明,本试验中区试地点分类上用对照品种多年多点的千粒重资料为变量,聚类效果较好。按其4年千粒重的距离,13个区试点可分为2片、6区、10组。一、大运河以东片。包括:(一)东部平原,有苏州、南通(如东);(二)沿河低地,有武进、常熟、兴化;(三)沿海砂土区,有盐城、大丰。二、大运河以西片。包括:(四)高砂土地区,有扬州;(五)丘陵区,有镇江、仪征,南京;(六)沿江、沿湖区,有江浦、金湖。最后根据聚类结果,对区试点的调整问题进行了讨论。

For the purpose of obtaining a probability α of a significant difference between a pair of cultivars and based on the knowledge of a good estimate of the standard error from the past experience, the number or replications (n) suggested to be used can he calculated with the formula of n≥(σ/δ)~2 ·t_(0.05)~2 .The value of n depends only on the σ/δand is independent of the units used for σ and δ provided they are the same for both. Hence, if they are standardized by the overall mean, the formula can be rewritten...

For the purpose of obtaining a probability α of a significant difference between a pair of cultivars and based on the knowledge of a good estimate of the standard error from the past experience, the number or replications (n) suggested to be used can he calculated with the formula of n≥(σ/δ)~2 ·t_(0.05)~2 .The value of n depends only on the σ/δand is independent of the units used for σ and δ provided they are the same for both. Hence, if they are standardized by the overall mean, the formula can be rewritten as: CV≤D(n/2/t_(0.05)_(1/2). Using the formula as an equation for CV and fixing n=3, 4, 5 and 6, the required CV% for testing various differences at the t_(0.05) is shown in table 1.Historical data from wheat and barley cultivar regional tests (1981-1985) in the Jiangsu Province were used to find out the distributional pattern of participating locations with respect to the coefficient of variation (CV) and D, the difference between the best check cultivar and the best test cultivar expressed as percentage of the mean at each location. The average CV in these regional tests is about 6%, which is adequate for detecting D values greater than 20% only. However, differences of this magnitude occur in no more than about 17% and 30% of recent trials for harley and wheat, respectively. These results suggest that the present levels of CV within location are too high and need to be reduced.Ways to improve precision of these regional tests are discussed. Increasing the number of replications is one of the most effective ways.

采用随机区组设计进行品种区域试验,在多重比较时,对照品种与参试品种的差异显著性可用最小显著差数浊(L.S.D)测验。由L.S.D可推导出CV≤D·(n/2/t_α)~(1/2)。由此可推算出一定概率平准保证下的精确度要求。按重复数3、4、5、6、推算了一定平均差数百分率(D=(B-A)/x×100%)下,5%概率平准容许的最大变异系数,列于表1。对江苏省近几年来小麦、大麦区试的历史资料进行分析,其平均CV约为6%,这样水平的CV仅适于测验D>20%的试验。而这样大小的差异,在大麦和小麦近年来的区域试验中,分别仅占17%和30%以下。结果表明,各试验点现在的CV水平过高,必须予以降低。对改进区域试验精确度的途径进行了讨论。增加重复次数也许是最有效的途径之一。

This study analysed the yield stability of new hybrids of rice throgh the data from cultivar regional tests in 1987. The results showed as follows: 1. The yield and yield stabity of Dyou 10 are the best in the regional tests. 2. The correlation coefficent between mean yield and regression coefficient bi were nonsignificant) r_x. bi=0.293). 3. The hybrid yield stability was associated with the harmony of main characters changes to a series of enviroments.

对杂交水稻新组合的区试资料进行了初步分析,认为1、D优10号丰产性好、适应性强;2.杂交水稻产量与其稳定性参数bi间相关性不显著(V·bi=0.293);3.杂交水稻产量的稳定性似与其有效穗数相关联,且可能与其主要农艺性状在不同环境条件下变化的协调性有关。

 
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