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nitrification
相关语句
  硝化
    EFFECTS OF CYANAMIDE NITROGEN ON THE INHIBITION OF NITRIFICATION AND ITS FIELD APPLICATION
    氰氨态氮的硝化抑制效应及其在农田的应用
短句来源
    Studies on Nitrification and Application Effect of Different Sources of Nitrogen Fertilizer on Flue-cured Tobacco
    不同氮源的硝化特点及在烤烟上施用效应的研究
短句来源
    , the roots are actually exposed to a mixed nutrition of NH_4~+ and NO_3~-due to the excretion of O_2 by the roots and subsequent nitrification in rhizosphere.
    但值得注意的是,水稻根系能分泌O_2,这些O_2能被土壤硝化微生物利用,将NH_4~+氧化为NO_3~-,因此水稻根际中存在着一定的NO_3~-。
短句来源
    The rate of nitrification of urea and NH_4~+-N could beexpressed as the formula Y=Ae~(bx).
    尿素和铵态氮的硝化速率呈 Y=Ae~(bx)指数方程。
短句来源
    In fact, the roots of rice can excrete O_2 to surrounding soil and this can convert NH+_4 to NO-_3 in the process of nitrification at root surface or in rhizosphere.
    但值得注意的是 ,水稻根系能分泌氧气 (O2 ) ,这些O2 能被硝化微生物利用 ,从而将NH+ 4 氧化成NO-3 ,在根表形成的NO-3 立即被水稻吸收。
短句来源
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  硝化作用
    The NH + 4-N was 50.5% of applied nitrogen fertilizer in short time after application. NH + 4-N in soil sharply decreased with nitrification and crop uptake afterwards.
    施肥后短期以NH+ 4 N存在的肥料N占施N量的 5 0 5 % ,随着硝化作用的进行和作物的吸收 ,土壤中的NH+ 4 N显著下降。
短句来源
    NITRIFICATION IN RICE RHIZOSPHERE AND THE NITRATE NUTRITION OF RICE
    水稻根际的硝化作用与水稻的硝态氮营养
短句来源
    Spatiotemporal variations of nitrification in rhizosphere soil for two different rice cultivars at the seedling stage growing under waterlogged conditions
    淹水条件下籼稻与粳稻苗期根际土壤硝化作用的时空变异
短句来源
    Changes of Ammonification and Nitrification Intensity of Soil Nitrogen in Tobacco Field
    烟地土壤氮素的氨化作用与硝化作用的强度变化
短句来源
    CHARACTERISTICS OF MINERALIZATION AND NITRIFICATION IN SOILS OF TEA GARDENS DIFFERENT IN AGE
    不同利用年限茶园土壤矿化、硝化作用特性
短句来源
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  “nitrification”译为未确定词的双语例句
    Effects and methods of urea application combined with urease or nitrification inhibitors under drip irrigation on maize
    玉米滴灌栽培条件下尿素与氢醌、双氰胺配施方法及效果
短句来源
    Soil N2O production was mainly attributed to nitrification-denitrification, meanwhile under some particular condition soil nitrification was the main source of N2O production/emission such as in the period just after nitrogen topdressing in summer maize season.
    冬小麦夏玉米轮作体系下,夏玉米生育期是土壤反硝化损失氮量的关键阶段,同时也是N_2O生成与排放的关键阶段。
短句来源
    3. Due to less clay content and looseness of Entisol, and a fast speed of nitrification, nitrogen input to the soil mostly presented as nitrate.
    3. 土壤质地极显著的影响硝态氮在土壤中的累积与运移。
短句来源
    Under 45% FC, the contribution of N2O emission from nitrification and denitrification in NH4HCO3 treatment were 84.77% and15.23%, respectively, and 71.78% and 28.22% for 65% FC, 48.50% and 51.50% for 100% FC. Then we could draw a conclusion that nitrification was the main source of N2O emission in this experiment.
    4. 在45%和65%田间持水量(Field Capacity,FC)条件下,施用铵态氮肥土壤的
短句来源
    , The highest NO3-N and net nitrification rate were detected under 25℃/60FC for 8-year stand of Lucerne, 15℃/40FC for 3-year stand of Lucerne at regreen stage.
    3龄苜蓿土壤第一、三次刈割表层土壤无温度水分交互效应。 第二次刈割时期3龄苜蓿在(25℃,30FC)下达到最大;
短句来源
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  nitrification
Low levels of NO3- in these forest soils generally correspond to low net rates of nitrification.
      
Nitrification and denitrification in subalpine coniferous forests of different restoration stages in western Sichuan, China
      
Nitrification is the biological conversion of organic or inorganic nitrogen compounds from a reduced to a more oxidized state.
      
The results showed that forest restoration stage had no significant effects on gross nitrification rates or denitrification rates (One-way ANOVA (analysis of variance), p >amp;lt; 0.05).
      
There was no significant difference in the temperature coefficient (Q10) for gross nitrification rate among all the forest sites (One-way ANOVA, p >amp;lt; 0.05).
      
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Incubation, pot and field experiments were carried out to study the inhibitory effects of nitrification of cyanamide nitrogen in cultivated soils, and the response of the inhibitors on yield by growing field crops. The results are summarized as follows: 1. The effect of cyanamide and dicyandiamide on the inhibition of nitrification is significant. It was observed that in the inhibitory effect of cyanamide on the inhibition of nitrification was higher than that of dicyandinamide on the waterlogged...

Incubation, pot and field experiments were carried out to study the inhibitory effects of nitrification of cyanamide nitrogen in cultivated soils, and the response of the inhibitors on yield by growing field crops. The results are summarized as follows: 1. The effect of cyanamide and dicyandiamide on the inhibition of nitrification is significant. It was observed that in the inhibitory effect of cyanamide on the inhibition of nitrification was higher than that of dicyandinamide on the waterlogged state; the lower value in the latter could be attributed to the higher rate of decomposition in comparing with the former. Inversely, the inhibitory effect of dicyandiamide was higher than cyanamide on the upland state. 2. Experimental results showed that suitable ratio of nitrogen applications from 5:1 to 3:1 by mixing nitrogen fertilizer with cyanamide nitrogen, i.e. calcium cyanamide application rate by 17-25% of the total fertilizer nitrogen should be applied under most of the soil conditions. That doses and ratios can increase the yie Ids, without any harmful effect on crops. 3. When nitrogen fertilizer was applied in combination with calcium cyanamide, more fertilizer nitrogen were absorbed by crops than that with dicyandiamide under waterlogged conditions, therefore it can reduce the production cost.

本文探讨了氰氨态氮的硝化抑制效应,比较了氰胺和双氰胺在农田的使用效果。研究结果表明,氰胺和双氰胺都能抑制硝化作用,从而提高氮肥利用率。在水田土壤中,氰胺的分解速度比双氰胺缓慢,硝化抑制效应持续时间较长,其增效作用比双氰胺大;在旱田土壤则相反,双氰胺的硝化抑制效应大于氰胺。在正常的条件下,氰胺是氰氨化钙分解的主要产物。试验结果表明,氮肥与氰氨态氮的配合比例以5:1~3:1为宜。在多数情况下,这个浓度水平对作物无害,并能充分发挥增效作用。同时,在水田土壤中,氮肥与氰氯化钙配施,其增效作用比双氰胺大,而成本却比双氰胺为低。

A Study was carried out by using ~(15)N tracing method to examine uptaking andutilizing nitrogen fertilizer by tea plant.The majority of the nitrogen uptaked by theplant in spring was transported into the aerial parts,and the minority was kept inthe roots.The nitrogen content was maximun in the shoots and the sucking roots.The plant continuously uptaked nitrogen in autumn and winter but its ability decreasedwith the decrease of temperature.The nitrogen uptaked in autumn and in winter wascharacterized by“utilization-acummilation-reutilization”.The...

A Study was carried out by using ~(15)N tracing method to examine uptaking andutilizing nitrogen fertilizer by tea plant.The majority of the nitrogen uptaked by theplant in spring was transported into the aerial parts,and the minority was kept inthe roots.The nitrogen content was maximun in the shoots and the sucking roots.The plant continuously uptaked nitrogen in autumn and winter but its ability decreasedwith the decrease of temperature.The nitrogen uptaked in autumn and in winter wascharacterized by“utilization-acummilation-reutilization”.The re-utility(?)of the solublenitrogen stored in the roots was higher.The utilization percentages of the nitrogenfertilizer applied in spring and in summer were 44.7% and 20-30% respectively.Bythe end of Spring tea season,the utilization percentage of the nitrogen applied inautumn and winter was 18.08-30.82%.The earlier the fertilizer applied,the higherthe utilization percentage Was.The utilization percentage of 3 different sources wasNH_4~+-N>Urea-N>NO_3-N.The rate of nitrification of urea and NH_4~+-N could beexpressed as the formula Y=Ae~(bx).

用同位素~(16)N 示踪法研究了茶树对氮肥吸收和利用,结果表明,茶树在春茶期间所吸收的氮肥大部份被输送到地上部,保留在根系中的只是少数;地上部以芽叶中含量最高,根系以吸收根中含量最高。茶树在整个秋冬季节都能连续不断地吸收氮肥,但吸收能力从秋到冬随温度降低而下降。秋冬期吸收的氮表现出利用——积累——再利用的特点;贮藏于根中的可溶态氮具有较高的再利用率。茶树对肥料氮的利用率,春肥达44.7%,夏肥为20—30%,秋冬肥到春茶结束时达18.08—30.82%,其中以早施的利用率高;三种氮源的利用率:铵态氮>酰胺态氮>硝态氮。尿素和铵态氮的硝化速率呈 Y=Ae~(bx)指数方程。

The green manure experiment was conducted during 1985-1987. The results showed that green manure had obvious effects on soil characteristics and crop yield. Planting green manure on fallow lands and cropland on which the winter highland barley had just been reaped could harvest green grass of 31.76-38. 54ton/ha. In autumn,ploughing the green manure of common vetch (Vicia sativa L.) of 37.5-70.0 ton/ha.,the content of organic mantter te in the surface layer of soil could be raised 0.22-0.37%, the content of total...

The green manure experiment was conducted during 1985-1987. The results showed that green manure had obvious effects on soil characteristics and crop yield. Planting green manure on fallow lands and cropland on which the winter highland barley had just been reaped could harvest green grass of 31.76-38. 54ton/ha. In autumn,ploughing the green manure of common vetch (Vicia sativa L.) of 37.5-70.0 ton/ha.,the content of organic mantter te in the surface layer of soil could be raised 0.22-0.37%, the content of total nitrogen increased by 0.005-0.008%.After growing green manure,the bulk density of soil decreased by 0.071-0.122 g/cm3 with an increase of porosity by 6.98-8.82%. Other characteristics such as the number of microorganism in soil,the intensity, the nitric nitrogen and tne intensity of nitrification all increased apparently. By improving the soil characteristics, the yield of highland barley in the next year increased by 18.5-32.5%and 39.5-56.1%respe-ctively as compared with that of fallowland barley continuous cropping lands

1985~1987年的绿肥定位试验结果表明:利用休闲地及作物后茬的水热资源种植绿肥箭舌碗豆,亩产鲜草2117.4~2569.2公斤,春播处理高达4937.5公斤;每亩秋季翻压绿肥鲜草2500~5000公斤,可使土壤耕层有机质含量提高0.22~0.37%,全氮含量增加O.0O5~O.0O8%;种植绿肥后,土壤容重比对照降低O.071~O.122克/厘米~3。孔隙度由44.37%和39.83%增加到48.65~51.35%;土壤微生物数量及呼吸强度、硝态氮、硝化强度都明显高于休闲地与青稞连作;绿肥后茬青棵比休闲地增产18.5~32.5%,较青稞连作增产39.5~56.1%,具有明显的培肥改土作用与增产效果。

 
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