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different
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    Growth and Development and Expression Analysis of Genes in Different Upland Rice Roots under Water Deficit
    水分亏缺条件下旱稻根系发生发育及相关基因的表达分析
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    Eco-Physiological Characteristics and Regulation of Nitrogen Uptake and Utilization Efficiency in Different Rice Genotypes
    水稻品种氮素吸收利用效率的生理生态特征及调控研究
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    Genetic Improvement of Rice for Disease Resistance and Salt Tolerance by Overexpression of OsiWRKY and OPBP1, Two Different Transcription Factors
    利用转录因子OsiWRKY和OPBP1基因提高水稻抗病及耐盐性研究
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    Screening and Classification of Rice with Different Phosphorus Efficiency and Physiology Mechanism
    耐低磷水稻筛选、分类及其生理机制研究
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    Study on the Phase Responses and Mechanisms of Different Winter Wheat Varieties to Drought
    小麦对水分亏缺的阶段性反应及其机制研究
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  different
An example shows that the differentiable structures can indeed be different, even though they are isomorphic.
      
the volume computations involve several different methods according to the parity of dimension, subgroup relations and arithmeticity properties.
      
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For the study of the influence of oxidation-reduction conditions of thesoil on the growth of rice plant,pot experiments with three paddy soilswere conducted.The used soils included an acid paddy soil derived from quartiary red clay,an acid mountain paddy soil derived from granite anda neutral alluvial paddy soil.It was found that the application of green manure just before plantingin amount equivalent to 1% of the soil led to the retardation of growth ofrice as compared with the control treatment;dry weights...

For the study of the influence of oxidation-reduction conditions of thesoil on the growth of rice plant,pot experiments with three paddy soilswere conducted.The used soils included an acid paddy soil derived from quartiary red clay,an acid mountain paddy soil derived from granite anda neutral alluvial paddy soil.It was found that the application of green manure just before plantingin amount equivalent to 1% of the soil led to the retardation of growth ofrice as compared with the control treatment;dry weights of tops of riceplant amounted to only 78%,22% and 45% respectively of the controls forthe three soils.The difference in growth between the two treatments wasmost remarkable in the early period of plant growth.If the green manurehad been decomposed for one month in pot under semi-aerobic conditionsbefore planting,then the unfavorable effect could be noted only in theneutral alluvial paddy soil which contained a relatively larger amount oforganic matter.The improvement of oxidation-reduction conditions of the soil by inter-mittent applications of hydrogen peroxide and keeping the soil moisturecontent at a level of about 50—70% of water-holding capacity instead ofwaterlogging improved plant growth in soils with intensive reductionprocesses,the effect being most conspicuous in the acid mountain paddysoil where the unfavorable effect of green manure was also most remark-able.Measurements of oxidation-reduction potentials of leaves and stalks ofrice showed that the potentials were lowest when grown in pots with greenmanure,and were highest when hydrogen peroxide had been applied intothe soil.There was also a rough correlation between potentials determinedwith platinum electrode and with quinhydrone electrode,thus indicatingthat the redox systems of rice plant when grown under different oxidation-reduction conditions were not the same both expressed as intensity factor(redox potential)or as quantity factor(the change in redox potential ofquinhydrone).For the purpose of explaining the unfavorable effect of intensively re-duced conditions of the soil on the growth of rice plant,it was noted thatthere was a parallelism between the amounts of exchangeable and water-soluble ferrous iron of the soil and the magnitudes of unfavorable effect.Further pot experiment confirmed this supposition,in which the applicationof ferrous sulfate in amount of 50 mg.iron per 100 grams of soil alreadyled to the retardation of growth of rice.Conclusions were made that the unfavorable effect of reduction condi-tions of paddy soils on the growth of rice was due to the excessive amountof reduced materials,in which ferrous iron probably occuppied an out-standing position,and measures leading to the improvement of oxidation-reduction conditions of the soil could overcome this unfavorable effect.

1.土壤处于强烈的还原条件下时,对水稻生长有不良的影响,如果将土壤中的氧化还原条件改善,则对水稻的生长有益。2.土壤中的氧化还原情况,直接影响水稻体中的氧化还原电位,土壤电位低者,水稻中的电位也低。3.土壤中还原性物质的数量与水稻生长情况表现了明显的一致性,可见水稻在强烈还原条件下的生长不良,与还原性物质的过多有关。在还原性物质中,亚铁离子约占一半左右。4.试验结果指明,土壤中过多的亚铁离子,对水稻有毒害作用。

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...

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 present paper deals with the influence of the intensity and its persistence of nitrogen supply to the formation and development of the organs of rice plant and also with the resulting physiological feature of these influences. Pot culture experiments with paddy soils were conducted in open field. Organic manure and ammonium sulphate were applied at different stages of growth, i.e. tillering, internode elongating and panicle differentiating stage. The results are summarized as follows:1. Experiments...

The present paper deals with the influence of the intensity and its persistence of nitrogen supply to the formation and development of the organs of rice plant and also with the resulting physiological feature of these influences. Pot culture experiments with paddy soils were conducted in open field. Organic manure and ammonium sulphate were applied at different stages of growth, i.e. tillering, internode elongating and panicle differentiating stage. The results are summarized as follows:1. Experiments revealed that various organs of rice plant gave different responses to the status of nitrogen supply, and to the same organs, their responses of nitrogen varies at different stages of growth. At the tillering stage, a strongly intensified and less persistent supply of nitrogen, as in the case of ammonium sulphate, promoted the assimilation of dry matter in leaf blade, and consequently enlarged the leaf areas. Such an effect on the leaf blade, however, terminated after the internode elongating stage, and more accumulation of dry matter was found in the stems. Top dressing of manures, pertinently after the internode elongating stage, gave a moderate but persistent supply of nitrogen at that time and resulted the formation of large and healthy ears. Under theexperimental condition, such treatments have been proved favourable to the growth and yield of rice.2. The influence on the growth of the organs, as resulted by changing the status of nitrogen supply, is mainly induced by the rate of accumulation and translocation of nitrogen in plant. A strongly intensified, but less persistent, nitrogen supply accelerates the rate of translocation of nitrogenous materials, while a less intensified but rather persistent supply of nitrogen retains more nitrogenous materials in leaf blade.3. It is evidently that the demand of nitrogen supplying status of rice plant differs at different growing stages. Under the experimental condition, high yields of rice crops were attained by a slower but persistent rate of nitrogen suppy in the tillering stage; a faster but less persistent rate in the internode elongating stage and also a moderate but persistent rate in the penicle differentiating stage. Since property of soil nitrogen varies in different soil type, the regulation of nitrogen supplying status by fertilization should be different in cach cases.

1.晚稻植株的不同器官对氮素供应状况的反映不同,其中叶片較为敏銳。而同一器官在不同生育时期內影响也不一样谂柙缘奶跫?叶片在分蘖期中,氮素供应強度大、持續时間短比強度小、持續时間长的处理更能促进叶片干物貭累积,增大叶面积。而拔节期以后,影响不明显并略有相反趋势。对于茎稈則在供应強度大及其持續时間短的情况下,不論拔节期或分化期处理都明显地促进其干重的增加。穗粒的形成条件却是強度小而持續时間长的有利于每穗粒数的提高。但是,氮素供应状况的影响显著与否还可能受着基肥水平的制約,在高量基肥的条件下影响极不显著。2.土壤氮素供应状况影响器官生长的原因,初步看来是通过对植株体內氮素累积和运轉速度的影响而发生作用。由于不同生育时期內,叶、鞘、茎、穗本身的生长特点各异,所要求的物貭累积与运轉的強度也各不相同。因此,氮素供应状况对器官生长的影响也就不全相同。3.根据試驗結果,初步认为水稻对土壤氮素供应状况的要求是分蘗初期緩而长,拔节期快而短,穗分化期緩而长。因此,結合不同土壤的供肥特点需要利用有机厩肥或速效化肥等性貭不同的肥料在次数及用量上加以調节。4.初步认为施肥原則掌握的主要內容是根据水稻器官协調生长的需要以調节土壤的氮素...

1.晚稻植株的不同器官对氮素供应状况的反映不同,其中叶片較为敏銳。而同一器官在不同生育时期內影响也不一样谂柙缘奶跫?叶片在分蘖期中,氮素供应強度大、持續时間短比強度小、持續时間长的处理更能促进叶片干物貭累积,增大叶面积。而拔节期以后,影响不明显并略有相反趋势。对于茎稈則在供应強度大及其持續时間短的情况下,不論拔节期或分化期处理都明显地促进其干重的增加。穗粒的形成条件却是強度小而持續时間长的有利于每穗粒数的提高。但是,氮素供应状况的影响显著与否还可能受着基肥水平的制約,在高量基肥的条件下影响极不显著。2.土壤氮素供应状况影响器官生长的原因,初步看来是通过对植株体內氮素累积和运轉速度的影响而发生作用。由于不同生育时期內,叶、鞘、茎、穗本身的生长特点各异,所要求的物貭累积与运轉的強度也各不相同。因此,氮素供应状况对器官生长的影响也就不全相同。3.根据試驗結果,初步认为水稻对土壤氮素供应状况的要求是分蘗初期緩而长,拔节期快而短,穗分化期緩而长。因此,結合不同土壤的供肥特点需要利用有机厩肥或速效化肥等性貭不同的肥料在次数及用量上加以調节。4.初步认为施肥原則掌握的主要內容是根据水稻器官协調生长的需要以調节土壤的氮素供应強度及其持續时間,造成最和諧与最有效的土壤——植物供求关系。

 
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