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maize season
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  玉米生长期
     Study on nitrification-denitrification of soil nitrogen in summer maize season
     夏玉米生长期土壤氮素的硝化-反硝化作用研究
短句来源
  “maize season”译为未确定词的双语例句
     Under farmer traditional nitrogen application conditions (375kg/hm2N nitrogen fertilizer applied at winter wheat season and 240kg/hm2N applied at summer maize season) , the recovery of fertilizer nitrogen by crops at current seasons for conventional fertilization was approximately 26%, while 29%-32% was lost and 41%- 45% of applied nitrogen remaining at 0-100cm soil profile.
     在农户习惯施肥水平下(冬小麦季施氮量375kg/hm~2N,夏玉米季施氮240kg/hm~2N),当季作物化肥氮的利用率约为26%,损失率为29%—32%,0-100cm土壤残留量为41%—45%。
短句来源
     Compared with common urea,NUE of coated urea and compound fertilizer was bigger,especially when 90 kg N/hm~2 for Zhengdan958 and 180 kg N/hm~2 for Nongda108.(4)After summer maize season,all treatments of two cultivars showed soil N deficit(SND) and the amount of SND decreased with the increment of N application rate.
     与普通尿素相比,包膜尿素与复合肥利用率较高,郑单958施N 90 kg/hm2与农大108施N 180 kg/hm2时,两者对NUE的提高尤为明显; (4)本试验条件下,经过夏玉米生长季,两品种各处理均出现土壤氮素表观亏缺,亏缺量随施氮量增大而降低;
短句来源
     Under farmer traditional nitrogen application conditions, crop yield increment per kilogram nitrogen fertilizer in winter wheat season and summer maize season were 2 kilogram and 3-7kilogram respectively.
     在农户习惯施氮水平下,冬小麦每公斤氮肥增产2公斤籽粒,夏玉米每公斤氮肥增产3-7公斤籽粒。
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
     4) After summer maize season,soil N deficit(SND) appeared in all stages in zero N treatment,and about 80% of the amount of SND appeared after silking.
     4)不施氮,各生育阶段均出现土壤氮素表观亏缺,且吐丝后亏缺量占总亏缺量近80%;
短句来源
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  相似匹配句对
     Study on the Metabolism of 32 P-phosphate in Maize Small Season
     利用~(32)P示踪研究玉米苗期的磷素代谢
短句来源
     and maize cross.
     与玉米杂交导入一个小麦加倍单倍体 (DH)植株中。
短句来源
     OPEN SEASON
     狩猎季节
短句来源
     LOVE SEASON
     恋爱季节
短句来源
     Study on nitrification-denitrification of soil nitrogen in summer maize season
     夏玉米生长期土壤氮素的硝化-反硝化作用研究
短句来源
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  maize season
Higher NO3-N leaching occurred in maize season than in wheat season due to more water leakage caused by the concentrated summer rainfall.
      
Total urea N recovery by the maize roots increased from 1.8 to 3.2% during the 1994 maize season, while the Senna roots never recovered more than 0.8% of the applied urea-N at any time during the experimental period.
      
Spider catches during maize season were 77% greater in the presence of hedgerows than in their absence, but catches during other seasons were similar between the two cropping systems.
      
Denitrification loss ranged from 3.7 to 5.7?kg N ha-1 during the growing season of wheat (150 days) and from 14.0 to 30.3?kg N ha-1 during the maize season (60 days).
      
N2O sink activity during the maize season was recorded on 10 of the 29 sampling occasions and ranged between 0.18 and 0.94 g N ha-1 h-1.
      
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Location tests on soil salt movement was carried out by using isolated pool with undisturbed soil. Results showed that during crop cultivation period the mildly salinized or desalted Chao soil with salt content of 0. 11 - 0. 28% went on desalination at rate about 0. 0125% per year. During the winter wheat season soil salt moved upward and accumulated on top layer of soil, during summer maize season the soil salt moved downwards to deeper layer of soil. Salt movement can be taken as the transfer of salt...

Location tests on soil salt movement was carried out by using isolated pool with undisturbed soil. Results showed that during crop cultivation period the mildly salinized or desalted Chao soil with salt content of 0. 11 - 0. 28% went on desalination at rate about 0. 0125% per year. During the winter wheat season soil salt moved upward and accumulated on top layer of soil, during summer maize season the soil salt moved downwards to deeper layer of soil. Salt movement can be taken as the transfer of salt ions among soil layers. and the intensity of movement for different salt ion is difference with that of CL- and Na+ being more than SO4-2 and Ca+2, while CO3-2 rarely moves.

雷玉平,田魁祥,孙景玉,山崎 素直,但野 利秋:农田耕作与土壤盐分的变化,《生态农业研究》,3(3)1995:71—74 采用原状土隔离池进行了盐分运移的定位试验。结果表明:含盐量0.11—0.28%的轻盐渍化或脱盐潮土处在不断脱盐过程中,平均年脱盐速率为0.0125%;小麦种植期,土壤处于返盐过程,盐分在上层积累;夏玉米种植期,土壤处于脱盐过程;盐分运动是一个盐离子的层次间传递过程,不同盐离子传递的强度不同,以氯根和钠离子变动最大,而硫酸根和钙离子变幅较小,碳酸根较稳定。

The experiment was carried out in summer maize season in Beijing cinnamon soil to study subsoil denitrification and factors affecting denitrification. Acetylene inhibition method was used to measure denitrification in a static soil core incubation system. Soil cores from different soil depth up to 60 cm were collected together to be incubated in the jar near the experimental field for 24 hours. The results indicated that denitrification rate were great different between fertilizer N treatments in the surface...

The experiment was carried out in summer maize season in Beijing cinnamon soil to study subsoil denitrification and factors affecting denitrification. Acetylene inhibition method was used to measure denitrification in a static soil core incubation system. Soil cores from different soil depth up to 60 cm were collected together to be incubated in the jar near the experimental field for 24 hours. The results indicated that denitrification rate were great different between fertilizer N treatments in the surface soil layers. Reduced denitrification were also found in the subsoil, The nitrogen losses by denitrification in the 15~30cm soil layer was amounted to 10.7%~33.5% of that in the 0~15 cm, and the total nitrogen losses by denitrification in the 15~60cm soil layers were amounted to 14%~51% of that in the surface soil. Addition of carbon source greatly raised denitrification both in the 0~15 cm soil layer and 45~60cm soil layer. Discussion was made on factors affecting denitrification of subsoil in the cinnamon soil. Underestimation of N losses by denitrification in the field may be made without considering the subsoil denitrification.

在夏玉米生长期间 ,采用乙炔抑制 -原状土柱培养方法研究了北京褐土下层 (15~ 6 0cm)土壤的反硝化作用 ,并探讨影响该层土壤反硝化作用的主要因素。试验结果表明 ,施氮量越高 ,反硝化量越大。随着土壤层次的加深 ,反硝化量呈直线下降 ,但在亚表层土壤 (15~ 30cm)反硝化值仍保持了较高的量 ,约相当于表层的 10 .7%~ 33.5 % ;下层土壤 (15~ 6 0cm)的总反硝化量约相当于表层土壤的 14%~ 5 1%。加入碳源无论对表层土壤还是下层土壤 ,其反硝化损失氮量大大增加 ,尤其是对下层土壤增加的趋势更为明显。在计算夏玉米季土壤反硝化损失氮量时 ,如果忽略下层土壤的反硝化作用 ,肯定会低估其数值

Nitrification-denitrification and N2O prodution/emission from a fluvial soil were studied in wheat-maize rotation croppingsystem. The results showed that either denitrification-N loss or N2O endssion were quite low in wheat growth season due to lowersoil temperature and water content, and N2O-N production rate was almost comparable to denitrification or slightly lower than thelater.In maize season both denitrification-N and N2O emission increased significantly,and the dynamic of N2O-N production anddenitrification...

Nitrification-denitrification and N2O prodution/emission from a fluvial soil were studied in wheat-maize rotation croppingsystem. The results showed that either denitrification-N loss or N2O endssion were quite low in wheat growth season due to lowersoil temperature and water content, and N2O-N production rate was almost comparable to denitrification or slightly lower than thelater.In maize season both denitrification-N and N2O emission increased significantly,and the dynamic of N2O-N production anddenitrification was quite simile. After fertilizer nitrogen topdressing at the maize tenth leaf stage N2O emission rate was greatlyhigher than denitrification rate demonstrating that nitrification was mainly responsible for N2O production at least at this stage.Thereafter nitrogen loss by nitrification should not be neglected in evaluation of gaseous nitrogen loss.

在北京潮土上研究了冬小麦夏玉米轮作体系下土壤硝化反硝化作用以及N2O排放情况。结果表明,小麦生育期土壤温度及含水量较低,无论是反硝化损失氮量还是土壤的N2O生成排放量均不高。土壤的N2O生成排放量与反硝化氮量相当或低于反硝化氮量。玉米生育期土壤温度升高以及孔隙含水量有较大的改善,反硝化损失氮量、N2O生成排放量有明显上升。通常情况下土壤反硝化损失氮量与N2O排放氮量基本处于同一水平。在玉米十叶期追肥后的较短时间内,N2O总排放量明显高于反硝化损失氮量,说明至少在这一阶段中,硝化作用在北方旱地土壤N2O的排放中发挥了主要作用。在评价北方旱地农田土壤氮素硝化反硝化损失中,硝化作用的氮素损失是不可忽视的重要方面。

 
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