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production
相关语句
  产量
    Forecasting Methods for Agriculture Production and Their Computer Programming
    农产品产量预测方法及其电子计算机程序设计
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    AN ANALYSIS ON THE GREY FORECAST AND THE CONTROL OF GRAIN PRODUCTION IN SHANXI PROVINCE
    山西省粮食产量的灰色预测及其控制分析
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    Reserch on Winter Wheat Production of Rainfed Highland in Relation to Meteorological Conditions in Weibei of Shaanxi
    陕西渭北旱原冬小麦产量与气象条件关系的研究
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    PHOTOSYNTHESIS AND YIELD FORMATION OF DIFFERENT POPULATION STRUCTURES IN RAMIE Ⅱ. PHOTOSYNTHETIC PRODUCTION AND YIELD DIFFERENCE
    苧麻不同群体结构的光合作用和产量形成——Ⅱ.光合生产及产量变异
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    APPLICATION OF MINI-TILLAGE IN WINTER WHEAT PRODUCTION—EFFECT OF SAVING ENERGY AND EXPRESSION OF WHEAT YIELD CHARACTERS
    少耕法在小麦生产中的应用(一)——节能效果及小麦产量性状表现
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    Production of Transgenic Wheat (Triticum aestivum) Plants with Insectresisting gene via Three Optimized Genetic Transformation Systems
    优化三种遗传转化体系创造转抗虫基因小麦(Triticum aestivum)新种质
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    The Effect of Water and Fertilizer on Crop Production and Its Physiological Mechanism
    农田水肥效应及其生理机制研究
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    Study and Evaluation on Resistances, Production and Quality Characteristics of Different Alfalfa (Medicago Sativa) Varieties
    不同苜蓿(Medicago Sativa)品种抗逆性、生产性能及品质特性研究
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    Production of Marker-Free Transgenic Soybeans with γ-linolenic Acid
    表达γ-亚麻酸的无标记转基因大豆的培育
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    Production and Evaluation of Three Kinds of Insect-resistant Bt (cry1Ac、cry2A~* and cry9C~*) Rice
    三种Bt基因(cry1Ac、cry2A~*和cry9C~*)抗虫水稻的培育及评价
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  production
PRODUCTION OF ANTIBACTERIAL AND ANTIFUNGAL METABOLITES BY STREPTOMYCES VIOLACEUSNIGER AND MEDIA OPTIMIZATION STUDIES FOR THE MAX
      
Production medium was optimized for antibiotic production.
      
The uniqueness of the geodesic by its initial values severely restricts the choice of the fiber path and is an obstacle to the production of optimized structures.
      
Under a kind of utility function and production function, we prove that these conditions are satisfied and the economy at least has an optimal growth path.
      
This paper formulates a kind of dynamical macro-economic model based on Sidrauski's work, then presents the sufficient and necessary conditions of the stability of model at equilibrium states, and shows some results for special production functions.
      
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1.This paper includes two parts,namely the study of flowering biology and crossing technique in sweet potato,and the 3-year experi- mental results of several hybrid lines, 2.When a “short-day”condition of 8 hours was provided,sweet potato plants flowered about 10-25 days earlier than that under natural condition in Foochow.However,it varied with different varieties, different stages of treatment and environmental factors. 3.The percentage of cross-fertility,based on more than 1000 crosses we made during a 4-year...

1.This paper includes two parts,namely the study of flowering biology and crossing technique in sweet potato,and the 3-year experi- mental results of several hybrid lines, 2.When a “short-day”condition of 8 hours was provided,sweet potato plants flowered about 10-25 days earlier than that under natural condition in Foochow.However,it varied with different varieties, different stages of treatment and environmental factors. 3.The percentage of cross-fertility,based on more than 1000 crosses we made during a 4-year period,was about 45%.It seems that “mixed-pollination” and “repeated pollinaation”tended to increase the percentage of cross-fertility. 4.According to the 3-year experimental results,the hybrid lines, 5414-5 and 5414-8,were found to be hetter than their parents,Triumph 100 and Yoliow Sweet Potato,in yield.The hybrids were also superior to their parents in vine production.It seems that the hybrids were more adaptaple to environment conoitions than their parents. 5.The problem regarding the choice on combinations of parental pairs is discussed.The principle of choosing psrental pairs from geo- graphically distant locaties,propossd by I.V.Michurin,is a guide to sove this problem.A great number of hybrid lines are undergoing study.

1.本文包括两部分,即甘薯开花生物学和有性杂交技术的研究及几个杂交系的三年试验结果。2.当给以8小时短日条件,甘薯植株比在福州自然条件下的提早开花10——25天。但因品种、处理时期及环境条件而不同。3.根据四年来杂交一千余朵花的结果,甘薯杂交成功率约为45%。混合授粉及重复授粉似乎有增加杂交成功率的趋势。4.根据三年试验结果,发现二个杂交系,即5414——5和5414——8,在块根产量上比亲本胜利百号及黄薯都高。在蔓的产量上,杂交系亦比较亲本为优。而且这两个杂交系似乎比亲本具有较大适应不同环境条件的能力。5.关于选择亲本组合的问题曾加以讨论。米丘林所提出关于选择远地亲本的原则,对于这个问题的解决具有指导的作用。许多杂交系尚在继续研究中。

(The Kiangsu Affiliated Academy of the Chinese,Academy of Agricultural Sciences)Hybrid vigour in cotton has been reported by a number of workers.Most of them dealtwith interspecific hybrids.They were mostly marked with an increase in plant growth,especially in the F_1 crosses of American Upland × Sea-island and American Upland × Egyptiancotton.In order to study the possibility of producing an extra long fibre cotton in the Yang-tze basin and the Hwangho Plain by making use of hybrid vigour,the following problemswere...

(The Kiangsu Affiliated Academy of the Chinese,Academy of Agricultural Sciences)Hybrid vigour in cotton has been reported by a number of workers.Most of them dealtwith interspecific hybrids.They were mostly marked with an increase in plant growth,especially in the F_1 crosses of American Upland × Sea-island and American Upland × Egyptiancotton.In order to study the possibility of producing an extra long fibre cotton in the Yang-tze basin and the Hwangho Plain by making use of hybrid vigour,the following problemswere investigated at Nanking,Kiangsu during 1959-1962.(1)Combining ability between different interspecific crosses with special reference toyield,earliness and fibre qualities.(2)Morphological and physiological characters of economic importance in F_1 hybrids.(3)Performance of promising hybrids in field production.(4)Method of producing hybrid seeds with cheaper cost and less labour.Fifty-nine combinations were studied from 1960 to 1962,among which Pong-zai No.1(Upland cotton)×L.S.4923(Sea-island)was the best in yield and earliness.The averageyield of this F_1 hybrid in three years with 178 kg.of seed cotton or 53.7 kg.of lint cotton permow.As compared with the parents it was 94.35% of seed cotton or 82.2% of lint cotton ofthe yield of Delta-upland cotton and 187.17% of seed cotton or 172.74% of lint cotton of theyield of Sea-island L.S.4923.The fibre quality of F_1 hybrids approached Sea-island parent with a mean fibre length of40 m.m.,mean fibre fineness of 7000 meters per gram wt.,and single fibre strength of 4.5g.The methods and procedures for producing commercial hybrid cotton seed were as follows:(1)Hybrid F_0's seed was produced by hand emasculation and pollination which was ofvalue in areas abundant with hand-labor or adapted to transplanting for saving seeds up to4/5.(2)The female parent with recessive markers,was pollinated by hand without emascula-tion.In the thinning of the hybrid progeny all recessive plants were removed,leaving onlythe true F_1's.The recessive characters used for markers were virescent yellow foliage,redstem and hairy petiole of the seedling.The percentage of hybrid seed setting for differentupland cotton varieties ranged from 13% to 78%.Observations on heterosis in the characters of F_1 hybrids of G.hirsutum×G.barbadensewere summarized as follows:Plant Characters Comparison of bybrid with Upland and Seaisland parentsDays from planting to seedling Earlier than either parentDays from budding to flowering Intermediate nearer to earlier UplandDays from seedling to boll maturity Intermediate nearer to late Sea-island Days of bud development Intermediate nearer to earlier UplandDays of boll development Longer than Sea-islandDays from seedling to first boll maturity IntermediatePlant height Taller than either parentNumber of monopodia Less than either parent,but approaching Up landNumber of sympodia More than either parentNumber of fruiting points per plant More than either parentPosition of main stem nodes where first fruiting branch appears Lower than either parentInternode length of axis Longer than either parentInternode length of fruiting branch Longer than either parentPetiole length Longer than either parentLeaf area Larger than either parentLeaf lobe index Intermediate,approaching Sea-islandShedding percentage IntermediateDistribution of bolls in different parts of the plant Approaching Sea-island,most bolls setting at middle and upper parts of the plantWeight of seed cotton per boll IntermediateNumber of ovules per boll Approaching Sea-island in a lower numberMotes percentage More than either parentPistil length IntermediateCorolla area and index Larger than either parentSeed index Larger than either parentLint index IntermediateMaturity Intermediate,approaching late Sea-islandFibre length Longer than either parentFibre fineness Approaching Sea-islandYield in seed cotton Approaching Upland,higher than Sea-islandYield in lint cotton Lower than Upland,higher than Sea-islandProduction of dry matter More than either parentProduction of dry matter per square meter of leaf area More

1959—1962年试验证明,海陆杂种一代具有早熟、丰产、优质的特性。海陆杂种一代的籽棉产量接近陆地棉,而显著高于海岛棉。成熟期较海岛棉早,比陆地棉偏迟。生育特性一般介于两亲之间,不同程度的偏向于海岛棉,有的特性超过两亲范围以外。纤维细长,强度高,可以制成高挡纺织品。在江苏各地示范试种结果良好。在制种技术方面研究证明,采用具有某一隐性指示性状,进行不去雄杂交(人工辅助授粉),杂交率达70%,每工作日可制种6—8斤。

This paper deals with the genetic behaviour and breeding practice of the interspecific hybridsbetween G.hirsutum and G.arboreum obtained in 1944 and 1952.The main results are pre-sented as follows:1.The pollen grains of the Asiatic cotton germinate slowly on the stigma of the Uplandcotton.The growth of pollen tubes is slow and their female and male gametes are incom-patible at fertilization.Generally only a few ovules were fertilized within a boll.Owing tothe fact that the production of the nutritive substances...

This paper deals with the genetic behaviour and breeding practice of the interspecific hybridsbetween G.hirsutum and G.arboreum obtained in 1944 and 1952.The main results are pre-sented as follows:1.The pollen grains of the Asiatic cotton germinate slowly on the stigma of the Uplandcotton.The growth of pollen tubes is slow and their female and male gametes are incom-patible at fertilization.Generally only a few ovules were fertilized within a boll.Owing tothe fact that the production of the nutritive substances was inadequate to meet with the re-quirement of the normal development of the boll,it is difficult to obtain hybrids.In orderto promote the boll setting,pollinated maternal pollen grains ware applied on the stigmatawhich had been pollinated with paternal pollen grains several hours before.In this way,wegot the interspecific hybrids. 2.The interspecifie hybrids between these two species are physiologically abnormal.Thehybrids are highly sterile,either by selfing or by back crossing.The pollen grains of theUpland or Asiatic cotton may germinate on the stigma of the F_1 hybrids and the growing rateof their pollen tubes is also normal.Abnormality of the ovules may be the main cause forabortion.Most of the hybrid ovules have no embryo sacs.Occasionally a few ovules fertilized,but aborted during the development of embryoes.The chromosome number of the pollen mothercells of the F_1 hybrid,in general,is 39,or occasionally 52.The chromosome behaviour isirregular in meiosis,forming not only quartets,but also micronuclei.The percentage ofapparently well developed pollen grains is only 7.1% most of which are inviable too.The back-crosses either with the Upland or the Asiatic cotton as recurrent parent with F_1 hybrids aspollen parents are also with difficulty,because their pollen grains are highly abortive.3.The suitable concentration of sucrose in agar medium for artificial germination ofcotton pollen grains varies with cotton species:G.arboreum,34-35%,the Upland cotton,37-40%,and the Sea Island cotton,37-39%.4.By treating the mixed solution of 38% sucrose and a small amount of vitamin B1 onthe stigma of the F1 hybrid,the fertilization and development of the ovules may be promoted.The formation of the abcission layer of the stalk may be inhibited by the treatment of 5 p.p.m.2, 4-D linolin paste.By using the forementioned treatments,the fruiting percentage of theF_1 hybrids backcrossed with the Upland cotton rise up to 4.19%,even though there is only afew bolls with one mature seed,quite a number of them are seedless.Alternatively,by meansof repeated pollination,the fruiting percentage was 0.19%,and seeds are obtained.By usingG.arboreum L.as recurrent parent in backcrosses with the F_1 hybrids,the fruiting percentagerises up to 9.16%,but no seed has ever been obtained.5.For the purpose of improving the lint length and Ginning percentage,it is importantto choose the recurrent parent in the backcross with the F_1 hybrid.It may be ineffective forincreasing the number of backcrosses.6.The range of segregation of the lint length and ginning percentage of the backcrossprogeny,is wider in using F_1 hybrids as female parent than as males.Thus,it should beconcerned for selection of higher lint length and gining percentage.7.In the progeny of the interspecific hybrid of 1944 Combination,individual plants withgood economic characters were observed,such as lint length 41.3 mm.,ginning percentage 41.9%,hairiness,disease resistant,and early maturity,etc.By applying repeated selection of in-dividual plant,four desirable new strains were obtained:“Long Fibre No. 2,”“NankingCotton No.25,”“1003-7,”and “5161-2.”The characteristics of the “Long Fibre No.2”areearly maturity,long lint,single boll weight 5.28g.,fibre length 36 mm.,ginning percentage 31%,lint index 5.22g.,seed index 11.48g..The corresponding characters of the other varieties are:“Nanking Cotton No.25”:5.54g.,30-32 mm.,37-39%, 6.51g.,10.04g;“1003-7”:5.8g.,31,5mm.,38.6-39.18%,6.56g.,10.48g.;“5161-2”:5.20g.,30.31 mm.,39-39.7%,6.80g.,10.76g,respectively.

1.对陆地棉与中棉的杂种第一代和克服杂种第一代的不孕性进行研究,初步找出了不孕的原因和克服办法,为创造种间杂种,丰富育种材料,提供了可能。2.种间杂种遗传基础复杂,与具有优良性状多的陆地棉品种回交,获得许多超越亲本性状的新类型,可以选育出丰产、优质、抗病性强等的新品系。3.杂种第一代花粉母细胞染色体数,在同一花蕾上就有所不同,说明受精卵细胞在分裂的过程中已不正常,每一细胞的染色体数也不尽相同。

 
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