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period
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    Studies on the Accumulation and Distribution of the Nutrition of Tea Plant in the Autumn-winter Period
    秋冬季茶树养分的积累与分配的研究
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    LONG PERIOD FORECASTING MODEL FOR GREY CALAMITIES OF WHEAT SCAB
    小麦赤霉病灰色灾变长期预测模型
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    Influences of Additional Nitragon Manuring in the Middle and Late Period of Wheat Growth on Leaf Nitrogen Content, Grain Yield and Grain Protein Content
    中后期追氮对小麦叶片氮含量及籽粒产量、蛋白质含量的影响
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    STUDIES ON MONITORING PHYSIOLOGIC RACES OF WHEAT STRIPE RUST DURING THE PERIOD OF 1986-1990 IN GANSU PROVINCE
    1986—1990年甘肃省小麦条锈菌生理小种监测研究
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  period
Let 0≤g be a dyadic H?lder continuous function with period 1 and g(0)=1, and let.
      
The survival probability in finite time period in fully discrete risk model
      
To some two-period economies with countable infinite state spaces, the existence of expectation equilibrium of real asset economies with transaction costs is given.
      
Epidemiologic model of SIS type has a delay corresponding to the infectious period and disease-related deaths, so that the population size is variable.
      
This paper considers an SEIS epidemic model with infectious force in the latent period and a general population-size dependent contact rate.
      
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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。

The scientific application of an ideal rotation system on paddy fields,has now been considered as a very important problem for ensuring highergrain yields and promoting soil fertility.As the commencing work onrotation researches,authors had selected to study the Rice-Cotton rotationsystem in Yuyao,Chekiang Province.A series of investigations and ex-periments were conducted in the year of 1955,in order to realize thevariations of soil chemical properties and rice growth on those rotatedpaddy fields.The results...

The scientific application of an ideal rotation system on paddy fields,has now been considered as a very important problem for ensuring highergrain yields and promoting soil fertility.As the commencing work onrotation researches,authors had selected to study the Rice-Cotton rotationsystem in Yuyao,Chekiang Province.A series of investigations and ex-periments were conducted in the year of 1955,in order to realize thevariations of soil chemical properties and rice growth on those rotatedpaddy fields.The results obtained are summerized as follows:(1)During the period of Cotton rotation in paddy fields,the organiccontents in the soil tend to decrease,while the total exchangeable bases andavailable phosphorus show an apparant increase.By cultivating rice in suchfields,a reversible tendency appears,namely manifesting an increase ofsoil organic matter content and a decrease of both total exchangeable basesand available phosphorus contents.Besides,the formation of more am-monical nitrogen is found in the later case.(2)The Rice-Cotton rotation will assuredly increase the rate of ricegrowth as well as the yields of grains.Comparing with the unrotatedplot,paddy fields so rotated show an average increase of 9% in grainyeilds,as confirmed by field experiments.(3)In those rotated paddy fields,winter crop-green manure(Medicagodenticulata wild)grew vigorously and showed an increase of 70% in yields(based on fresh weight)as compared with unrotated paddy fields.(4)Rice-Cotton rotation may adjust the rate of the alternation of ac-cumulating and decomposing of soil organic matter,which we know willmarkedly promote soil fertility in paddy fields.Therefore,to save the ap-plication of manure and solve the shortage of fertilizers in grain produc-tion,the use of Rice-Cotton rotation system in certain district,is ofparamount importance at present time.

(1)稻田轮种棉花期间,土壤有机质含量有减低的趋势,但土壤代换性盐基总量及速效磷的合量均增高。轮种水稻期间,土壤有机质又有增加的趋向,而代换性盐基总量及速效磷则渐次减低。此外,土壤中铵态氮则有增多的趋势。(2)稻棉轮种能增强水稻的生长势,提高水稻的产量。根据对比试验及统计资料,一般比连种区增产9%左右。(3)稻田轮种棉花后,冬作绿肥生长良好, 鲜草产量比一般连种稻田增加70%以上。(4)在保证增产的前提下,轮种区的水稻基肥用量,一般可比连作稻区节省40%左右,而轮种区的绿肥产量又能增加,因此可自轮种田内割出60%的绿肥鲜草,作为其他稻田的基肥,而达到全面增产的目的,这在目前肥料普遍不足的情况下有其重要意义。

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。

 
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