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供氮     
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  nitrogen supply
     Under the condition of nitrogen supply 90 kg/hm2 at regreening stage and 100 kg/hm2 at shooting stage, N fertilizer recovery reached 44% and soil residual Nmin in 0-90 cm was lower than 50 kg/hm2 after winter wheat harvest.
     上述返青期90kg/hm2,拔节期100kg/hm2的优化供氮量下,氮肥利用率可达44%,收获后0~90cm土壤残留Nmin低于50kg/hm2,从而使氮素资源高效利用,并降低对环境污染的风险。
短句来源
     When nitrogen supply by soil Nmin in 0-60 cm and fertilizer was 90 kg/hm2 at regreening stage, it can meet the demand of winter wheat for nitrogen from regreening to shooting stage.
     返青期保证供氮量90kg/hm2(0~60cm土壤Nmin+肥料氮),可以满足冬小麦从返青期到拔节期对氮素的需求;
短句来源
     When nitrogen supply by soil Nmin in 0-90 cm and fertilizer was 100 kg/hm2 at shooting stage, it can meet the demand of winter wheat for N from shooting to harvesting stage.
     拔节期保证供氮量100kg/hm2(0~90cm土壤Nmin+肥料氮),可以满足冬小麦从拔节期到收获期对氮素的需求,最终达到目标产量。
短句来源
     Effect of Nitrogen Supply on Wheat Quality Ⅱ.Way of Nitrogen Supply
     氮素供应对小麦品质的影响Ⅱ、供氮方式
短句来源
     Results showed that: ①the basic amounts of soil nitrogen supply(on the average) of Indica rice was 25.6%,more than that of Japonica rice.
     结果表明:①籼稻的土壤基础供氮量平均比粳稻高25.6%;
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  nitrogen supplying
     If the soil initial NO - 3-N is low or considering the effect of initial NO - 3-N and NH + 4-N, the contents of NH + 4-N either evaporated by 1mol/L NaOH or extracted by hot KCl method in acid soils are good soil nitrogen supplying indexes, reflecting soil potential nitrogen supplying capacity.
     而在土壤起始NO- 3 N含量较低或考虑到起始NO- 3 N的影响后 ,1mol/LNaOH扩散出的NH+ 4 N或KCl煮沸法在酸性土壤上浸取出的NH+ 4 N则是较好的土壤供氮能力指标 ,反映了土壤潜在的供氮能力
短句来源
     Results showed that soil nitrogen content in the experiment area are much lower than those in other similar areas and the nitrogen supplying potential of soils is low (total N 0.4 g/kg averaged and alkali-hydrolyzable N 16.76 mg/kg averaged).
     结果表明,试验区土壤全氮含量平均为0.4 g/kg,土壤碱解氮为16.76 mg/kg,氮素水平低,供氮能力差。
短句来源
     Analysis and Evaluation of Soil Fertility and Soil Nitrogen Supplying Capacity
     土壤肥力及土壤供氮性能评价与分析
短句来源
     (2) results obtained in the field microplot experiments revealed that the contributions of subsoil to the nitrogen supplying capacity of the paddy fields ranged from 16% to 49%, with a mean value of 30%;
     (2)田间微区试验中,耕层以下土壤所供应的氮量占稻田土壤供氮量的16—49%,平均30%。
短句来源
     Study on Soil Nitrogen Supplying Indexes
     土壤供氮能力指标研究
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  n supply
     when G/(R+G+B) was 0.408-0.422, winter wheat was in optimum N supply state;
     当G/(R+G+B)处于0.408~0.422之间时,冬小麦的前期供氮较为适宜;
短句来源
     when R/(R+G+B) was 0.256-0.334, winter wheat was in optimum N supply state;
     当R/(R+G+B)值在0.256~0.334之间时,冬小麦的供氮适宜;
短句来源
     The highest content of leaf Vitamin C was obtained at N 10.0 mmol/L supply level,while a strong decrease in the content of leaf Vitamin C occurred when N supply level was higher than 10.0 mmol/L.
     供氮浓度从5.0mmol/L增加到10.0 mmol/L时,叶片的维生素C(Vc)含量显著增加,继续提高供氮水平,叶片Vc含量则明显下降;
短句来源
     The results indicated that shoot fresh weight and total biomass increased drastically with N supply level increasing from N 5.0 to 10.0 mmol/L,while above 10.0 mmol/L,no significant difference in plant growth was observed.
     结果表明,供氮水平由5.0 mmol/L增加到10.0 mmol/L,库拉索芦荟地上部产量和总生物量显著增加,继续提高氮水平芦荟地上部产量和总生物量没有显著增加;
短句来源
     Results showed that total dry weight showed a significant genotypic variation at both normal and low N supply(the CV was 18.21%and 29.03%,respectively).
     结果表明,小麦植株干重在低氮胁迫和正常供氮条件下都有较大的基因型变异(变异系数CV分别为29.03%和18.21%);
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  n supplying
     The results showed that the amount of soil N supplying and apparent N mineralization were 120-160 kg N/ha and 20-104 kg N/ha in three winter wheat growing season respectively.
     冬小麦季全生育期土壤供氮量在120-160 kg/hm~2 N之间,土壤氮素表观矿化量在20-104kg/hm~2 N之间,年度间变幅较大。
短句来源
     In splitting root culture,RL,RS and RT of N supplying side was increased by 80%~110%,60%~230% and 70%~260% under normal water circumstance,and by 50%~140%,60%~110% and 70%~260% under DS.
     分根培养无干旱胁迫下 ,供氮诱导 RL ,RS和 RT分别增加 80 %~ 110 % ,6 0 %~ 2 30 %和 70 %~ 2 6 0 % ; 干旱胁迫下分别增加5 0 %~ 14 0 % ,6 0 %~ 110 %和 70 %~ 2 6 0 %。
短句来源
     For the relative yield of wheat at 99% of target yield in Xiangyun and Yiliang,the optimal N supplying rate based on soil layers at 0~30 cm should be 129 kg·hm~(-2),233 kg·hm~(-2),respectively.
     达到99%小麦相对产量时所需的最佳供氮量,在祥云点和宜良点分别为129、233 kg.
短句来源
     SIGNIFICANCE OF SOIL ORGANIC MATTER, TOTAL N AND MINERALI ZABLE NITROGEN IN REFLECTING SOIL N SUPPLYING CAPACITY
     有机质、全氮和可矿化氮在反映土壤供氮能力方面的意义
短句来源
     The total amount of soil N supplying in a rotation period of winter wheat / summer maize was 167-242 kg N/ha. In three winter wheat growing seasons the soil N supplying decreased from 131 kg N/ha in the first year to 75 kg N/ha in the third year, however, in the summer maize growing seasons it still maintained at 125 kg N/ha, a relative higher level in the third year.
     土壤供氮量在冬小麦季由131 kg/hm~2 N降至75 kg/hm~2 N,但在第三年的夏玉米季仍能达到125 kg/hm~2 N。 轮作周期总的土壤供氮量处在167-242 kg/hm~2 N的较高水平;
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      nitrogen supply
    Moreover, nitrogen supply levels affected contents of total nitrogen and soluble proteins in leaves, and net photosynthetic rates.
          
    The activity of nitrile hydratase mainly depended on the carbon and nitrogen supply to cells.
          
    Effect of Exogenous Glucose on Photosynthesis in the Diatom Thalassiosira weissflogii Depending on Nitrate Nitrogen Supply and I
          
    Based on this qualified method, we investigated the variations of OsAMT1.1 (one of nitrogen uptake genes) and OsGlt1 (one of nitrogen metabolism genes) expression levels in rice seedlings under conditions of varying nitrogen supply.
          
    Improvement of Nitrogen Supply for L-Threonine Production by a Recombinant Strain of Serratia marcescens
          
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      nitrogen supplying
    The nitrogen supplying power of rice straw for flooded rice production was studied in three field experiments.
          
    Nitrogen supplying ability of some Philippine rice soils
          
    Assay of nitrogen supplying capacity of tropical rice soils
          
    The nitrogen supplying capacity of 39 wetland rice soils evaluated by two anaerobic incubation methods and six chemical methods was compared with N uptake of IR 26 rice grown on these soils under flooded conditions in a greenhouse pot study.
          
    The nitrogen supplying ability of some hydromorphic soils of raphia was measured under continuous moisture regimes of 50%, 200% and 200% alternating with 50% (soil-weight basis).
          
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      n supply
    With above 20 mg/L of sufficient NO3--N supply, phosphate was taken up excessively by the DNPAOs in anoxic condition, resulting in the ratio of phosphorus uptake to nitrate removal to be 1.97.
          
    The ratio between the production of carboxylate and the production of organic N Δ(C-A)/ΔNorg was constant with N supply in the plants receiving nitrate, but obviously declined with N supply for ammonium-fed plants.
          
    Nitrogen use efficiency (NUE), defined as grain dry weight or grain nitrogen as a function of N supply, was evaluated in 25 soft red winter wheat genotypes for two years at one location.
          
    Several variables including N uptake efficiency (total plant N as a function of N supply), grain harvest index, and N concentration at maturity were evaluated for their role in determining differences in NUE.
          
    1.Endomycopsis vernalis was cultivated on media with different N supply: series A 1%, series B 0,125% asparagine.
          
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      n supplying
    Studies were conducted on paddy soils to ascertain N2 fixation, growth, and N supplying ability of some green-manure crops and grain legumes.
          
    Soil samples (0-20 ) were analyzed for pH, organic matter quantity andquality, and the potential soil N supplying capacity.
          
    The reduction in soil organic carbon and N supplying capacity was strongest in the derived savanna zone where N supply explained 35% of the yield gap.
          
    An accurate method for predicting the N supplying potential of legumes must be available in order to select the most promising legumes.
          
    A laboratory procedure based on the aerobic incubation (35 °C) of soil samples taken from plots with legumes incorporated was proposed for predicting the N supplying potential of legumes to succeeding non-legume crops.
          
    更多          


    Ammonium bicarbonate, still being one of the main nitrogen fertilizers at present time in China, is easily volatilizable in soils. Various field experiments as well as practices have repeatedly shown that, if prilled and applied beneath the soil surface about 6 cm, its effect on the growth of crops will be markedly increased. In order to get some idea about the mechanism involved in its beneficial effect, the present study was undertakers. Experiments were carried out in pots under greenhouse conditions as well...

    Ammonium bicarbonate, still being one of the main nitrogen fertilizers at present time in China, is easily volatilizable in soils. Various field experiments as well as practices have repeatedly shown that, if prilled and applied beneath the soil surface about 6 cm, its effect on the growth of crops will be markedly increased. In order to get some idea about the mechanism involved in its beneficial effect, the present study was undertakers. Experiments were carried out in pots under greenhouse conditions as well as in the paddy field using N~(15)-tracer technique. The following is a summary of the results.1. When ammonium bicarbonate was prilled and deeply applied to the soil, much more total available nitrogen as well as ammonium nitrogen alone were found in the soil throughout the growing season, as compared with the surface-application of the powdery form. Neither surface application incorporation of the powdery fertilizer into surface soil have hardly matched with it in these respects.2. As compared with the powdery fertilizer applied in the conventional way, the deeply applied ammonium bicarbonate prills showed its fertilizing effect quite slower but rather steadier and hence lasting longer. The improved nitrogen supplying status of the soil resulted in a greater amount of nitrogen assimilation and dry matter production with an apparent strengthening of the over-all growth vigor of the rice plants.3. With high rates of fertilization (corresponding to 130 catties/mow), and under dense planting conditions, the nitrogen recovery of the deeply applied ammonium bicarbonate prills as calculated from the amounts of labelled nitrogen (N~(15)) found in the adjacent rice plants around the site of application, amounts to 75.5±3.4%, which constitutes more than half of the total nitrogen in the rice plants (i. e. 54.6±1.8% of the total nitrogen, to be exact). On the other hand, the nitrogen recovery of the powdery fertilizer applied in the conventional manner is generally much lower as has been widely reported. The difference in their recovery perentages may be ascribed mainly to the difference in their volatilization losses of ammoniacal nitrogen. Besides, the differences in their amounts of ammonium ion fixed by the soil, immobilization of available nitrogen by rhizosphere microorganisms, as well as the accessibility and availability of the fertilizer nitrogen to the plant roots may also bear some effects on their nitrogen recovery rates. Just to what extent each of these factors contributes to the total effects is yet to be illucidated by further experimentation.4. Under field conditions with a planting space of 10×10 cm. between hills, the nitrogen released for absorption from ammonium bicarbonate applied deeply in the center of space can only be accessible to the four rice plants around the site of application. This amounts to over 90% of the total nitrogen released for absorption from the fertilizer as shown by the N~(15)-tracer experiment.

    通过盆栽试验和田间N~(15)同位素试验,研究了碳铵粒肥在水田深施的氮素供应状况。结果表明,在碳铵粒肥深施情况下,土壤氮素总供应量在整个水稻生长期中,土壤NH_4-N量和速效氮量在施肥后持续30天的时间内,均显著高于粉肥表施和粉肥混施。粒肥深施对水稻的供氮特点是缓、稳、长,这反映在不同时间水稻的氮素积累量、干物质积累量和长势的变化上。粒肥深施明显地增进了水稻对肥料氮素的吸收。通过N~(15)的田间示踪试验表明,即使在重肥条件下,水稻对深施碳铵粒肥的氮素利用率也高达75.5±1.8%,水稻总积累氮量中有54.6±3.4%是来自于深施碳铵粒肥的。深施碳铵粒肥在田间的有效供肥范围为施肥点四周的第一圈稻株,约占碳铵总供肥量的90%以上,而第三圈已完全无效。

    This is a continuation of the study of the nitrogen availability index of green manure in rice pot experiment. The soil mixed with ~(15)N labelled milk-vetch was submerged and incubated at a constant temperature in the laboratory. After a set time of incubation, the soil was extracted with 0.5N neutral (pH 7.0) sodium pyrophosphate solution by reflux in a boiling water bath for 2 hours, and the ~(15)N fraction in the extract was then determined by alkaline distillation. The results indicated that the distillable...

    This is a continuation of the study of the nitrogen availability index of green manure in rice pot experiment. The soil mixed with ~(15)N labelled milk-vetch was submerged and incubated at a constant temperature in the laboratory. After a set time of incubation, the soil was extracted with 0.5N neutral (pH 7.0) sodium pyrophosphate solution by reflux in a boiling water bath for 2 hours, and the ~(15)N fraction in the extract was then determined by alkaline distillation. The results indicated that the distillable ~(15)N fraction served as a good index of N availability of green manure on the basis of both biological evaluation and statistical analysis. The correlation coefficient between the ~(15)N fraction and the ~(15)N recovery of rice plant, the number of tillers increased, and the comprehensive effect of the C% and N% of green manure all reached 1% level of significance.The results of statistical analysis indicated that the ~(15)N distillable fractions from extracts of green manure at different stage of decomposition were markedly different in their effect on the effective tillering of rice and their correlation with the C% and N% of green manure.It also demonstrated that the high percentage of C% and N% in green manure had practical significance in both the intensity and the quantity of nitrogen supply,which supported and supplemented our viewpoint showed in the previous paper.

    本文是水稻盆钵试验研究绿肥氮的有效度指标的继续。在实验室中,将标记的紫云英绿肥与土壤进行淹水恒温培养后,用0.5N中性(pH=7.0)焦磷酸钠溶液在沸水浴中回流2小时,然后分组测定~(15)N,结果表明这一方法所提取的可蒸馏~(15)N组分,可作为绿肥氮的有效度指标的生物学和统计学上的依据,它同水稻~(15)N的回收率、分蘖增长量的相关系数,及其在绿肥C%和N%的综合效应上都极显著。 数理统计与分析结果表明,绿肥在不同的分解时期,用焦磷酸钠法提取的可蒸馏~(15)N组分对于水稻有效分蕖的效应,以及同绿肥C%和N%的相互关系都有明显的差别,进一步阐明高N%和高C%对于绿肥的供氮强度和供氮数量的实际意义,充实了水稻盆钵试验的论点。

    The object of this study is to seek a simple and convenient biological method to properly evaluate the nitrogen supplying patterns and characteristics of the soil and different fertilizers under submerged condition.Used as an indicater crop, Wengcai (Ipomoca Aquatica Forsk) was continuously cropped and samples were taken at different stages by cutting for analyses. The data were treated by means of logistic equation. The results indicated that the continuously cropping method made it possible to increase the...

    The object of this study is to seek a simple and convenient biological method to properly evaluate the nitrogen supplying patterns and characteristics of the soil and different fertilizers under submerged condition.Used as an indicater crop, Wengcai (Ipomoca Aquatica Forsk) was continuously cropped and samples were taken at different stages by cutting for analyses. The data were treated by means of logistic equation. The results indicated that the continuously cropping method made it possible to increase the number of sampiing without an increase in the amount of work and gave a good picture of the dynamic nature of the nitrogen stpplying pattern under submerged condition.The results obtained from the pot experiment conformed with the actual field condition.The logistic curve equation was discussed in connection with the nitrogen supplying processes and intensities of the soil and different nitrogen fertilizers.The paddy soil used in this study was taken from Suzhou Prefacture, Jiangsu Province. The native fertility was high. The rate of nitrogen liberation was linearly increased before the peak of N supplying intensity, then rapidly declined and finally became smooth and steady. There was great difference between the N availability of chemical fertilizer and that of green manure, their N supplying processes being distinctly different. The "priming effect" of chemical fertilizer and that of green manure on soil nitrogen were similar before the peak of N supplying intensity but quite different after that. Finally the dynamic nature of the two fertilizers tagged with ~(15)N in the soil was discussed.

    探讨一种较简便的生物方法来正确地反映不同肥料和土壤在淹水条件下的供氮规律和特点。以蕹菜为指示作物进行连续种植分期刈割测定,并结合Logistic方程进行分析。结果表明,这个方法节约了工作量并增加了取样次数,获得的氮素动态图精确性高,也符合田间实际情况。 文章讨论了Logistic曲线方程描述的土壤和不同肥料的供氮过程和供氮强度的特点。试验土壤为江苏省无锡黄泥土,肥力较高,土壤氮素释放速度在供氮强度高峰期以前呈直线上升,以后则急剧下降并趋于平稳。化肥和绿肥的氮素有效度差异显著,供氮过程表现也迥然不同;他们对于土壤N的“激发效应”在供氮强度高峰期以前很相似,而以后则有明显的差别。最后讨论二种肥料~(15)N在土壤中的动态。

     
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