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rape
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  油菜
    STUDIES ON THE EFFECT OF NITROFICATION INHIBITOR ( ASU ) ON THE RATE OF UTILIZATION OF NITROGENOUS FERTILIZER IN RAPE PLANT BY USING 15N
    应用~(15)N研究氮肥增效剂ASU对提高油菜氮肥利用率的效果
短句来源
    A STUDY ON THE DIAGNOSIS OF K-DEFICIENCY IN RAPE PLANT
    油菜缺钾症诊断研究
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    Inducing Nodulation and Nitrogen Fixation on Rape Roots
    诱发油菜结瘤固氮的研究
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    EFFECTS OF RAPE PLANT POLLUTED BY SO_2 ON MYZUS PERSICAE (SULZER)
    SO_2污染油菜对桃蚜的影响
短句来源
    STUDIES ON BIO-CHEMICAL PKOPERTIES OF TURNIP MOSAIC VIRUSNo,1 ON RAPE OF CHINA
    中国油菜芜菁花叶病毒1号株系的生化性质研究
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    Formation of Nodular Structures and Nitrogen Fixation by Rhizobia on Oilseed Rape Roots Following Treatment with Pectinolytic Bacteria
    Formation of Nodular Structures and Nitrogen Fixation by Rhizobia on Oilseed Rape Roots Following Treatment with Pectinolytic Bacteria
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    Studies on Microbe Quantity Changes Around Flue-cured Tobacco Roots after Rape Cake Application
    烤烟施用菜籽饼后根际微生物数量变化研究
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    Experiments Study on UV-induced Mutation for Degradation of Crude Protein in the Rape Cake
    紫外诱变菌降解菜籽饼粕中粗蛋白的实验研究
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    Enzyme Linked Immunosorbent Assay for PAT Protein Detection in Genetically Modifed Rape
    转基因产品中PAT蛋白的酶联免疫检测(英文)
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    Under chemical fertilizer (Fl, f2), low doses of stover (37.5t/hm2) increased rape yield 32.9% and 610% respectively;
    在施用化肥(F1、F2)时,低量秸秆(37.5t/hm~2)处理的生物量分别增加了32.9%、610%;
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  rape
Rape (Brassica napus L.) was shown to be an appropriate sentinel plant, sensitive to phenanthrene, which can be used for testing the efficiency of phenanthrene degradation in soil.
      
Biological testing with the use of sensitive rape plants can be applied for estimation of the efficiency of phyto/bioremediation of PAH-polluted soils.
      
The Formation of Artificial Nitrogen-Fixing Symbioses with Rape (Brassica napusvar.
      
The treatment of rape plants grown in nonsterile soil with 2,4-dichlorophenoxyacetic acid (auxin-like growth-promoting substance) or their inoculation with the bacterial association Micrococcussp.
      
led to the formation of paranodules on the rape roots.
      
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The present paper reports studies on the relative rate of decomposition of nine different oil cake-meals [soybean, peanut, sesame, rape seed, cotton seed(with and without hull), chinese tallow seed (with and without hull)]. In the course of decomposition of the different oil cake-meals, freguent measurement were made of the quantity of evolved CO_2 gas, and amount of the NH_4~+, NO_3~-, and NO_2~- nitrogen formed at the given intervals of the day. These measurement served as indices of the intensity of...

The present paper reports studies on the relative rate of decomposition of nine different oil cake-meals [soybean, peanut, sesame, rape seed, cotton seed(with and without hull), chinese tallow seed (with and without hull)]. In the course of decomposition of the different oil cake-meals, freguent measurement were made of the quantity of evolved CO_2 gas, and amount of the NH_4~+, NO_3~-, and NO_2~- nitrogen formed at the given intervals of the day. These measurement served as indices of the intensity of decomposition and rate of ammonification and nitrification of the oil cake-meals that may be occur in the soil. These studies were performed in the laboratory, under room temperature condition of the summer season. All cakes were ground into meals to such particle size as to pass through a 20-mesh sieve. The cake-meals were separately mixed with cultivation soil in the proportion of one part of cake-meal to hundred parts by weight of soil. The soil used was of alluvial origin, low in organic matter and somewhat sandy in texture. It was found that decomposition of the cake-meals began soon after their application to the soil. The daily evolution of CO_2 reached its maximum for about one week. Immediately after that, the daily evolution of CO_2 declined rapidly to a such lower level and attained a rather steady declining rate after about two weeks. The trends were common in character irrespective of the kind of the cake-meals. Among the organic constituents of tile cake-meals that underwent into decomposition in the early days, nitrogeneous organic compou ads seemed to be of major importance. The production of ammonium compounds as a result of ammonification followed a trend similar to that shown by the evolution of CO_2. The maximum rate of ammonification was noticed sometime before the evolution of Co_2 had reached a maximum. The positive correlation existing between the total nitrogen content of the oil cakes and the rate of ammonification was evident. Other factors, however seemed to be also affecting the status of transformation of Nitrogen compounds. Nitrate compounds began to appear soon after ammonification had proceeded to an appreciable degree. In the course of decomposition their accumulation in the soil increased steadily with the time. Small amounts of nitrites were found under the experiment conditions which were characterized by low moisture content (25%) of the soil and meal mixtures. From the quantity of the total available nitrogen accumulated at different intervals in the course of decomposition as in the case here given, it seemed that some nitrogen might be lost through volatilization of ammonium compounds, since the soil was alkaline in reaction (the soil here used had a PH value of 7.2) Soaking the cake meals with water, lime-water, or straw-ash extract as sometimes practiced by the local farmers in some districts in Chekiang province brought about the effect of hastening ammonification and nitrification processes. But, gain in readiness of availability of the meals by this hastening effect might not compensate for the loss in total amount of available nitrogen formed. The loss was particularly evident when the cake-meals were pretreated with lime-water or straw-ash extract. It is believed that the alkaline reaction of the treated cake-meals accounts for this loss. The relative readiness of decomposition of the different oil cake-meals followed in descending order: soybean, sesame, peanut, Cotton seed (without hulls)>Cotton seed (with hulls), rape seed>Chinese tallow seed (with and without bulls). Similarly, the relative total amount of available nitrogen (including ammonium and nitrate nitrogen) formed during decomposition shows in the following order: soybean, peanut, sesame, chiness tallow seed(without hulls)>Cotton seed (with and without hulls)>rape seeds>Chiness tallow seed (with hlls).

研究了浙江省施用的九种主要餅肥在土壤中分解的情况,各种餅肥都經磨碎,并通过20孔篩。实驗証明,在夏天的温度下,餅肥施入土壤后即迅速分解,它的分解最盛时期是在一星期左右,此后即迅速下降,到二星期后,即漸趋穩定。餅肥施入土壤后,铵态氮的大量發生是在一星期以內,此后即迅速降低,轉化成硝酸态氮。硝酸态氮在一星期到二星期的时間内开始大量發生,到二星期后就漸趋穩定。土壤中有效态氮总量在各个形态轉化的过程中,有顯著的減少趋势。餅肥在施入土壤前用石灰、草灰或水处理一星期,可提早土壤中有效氮的發生,其中單用水处理的效果尤其好。实驗証明,用石灰或草灰处理餅肥,使有效态氮大量損失,而用水处理則沒有这种情况。在本实驗的条件下,各种餅肥的分解速率依次为:豆餅、芝麻餅、花生餅、棉仁餅>棉籽餅、生菜餅、熟菜餅>桕餅、青餅。各种餅肥中氮素化合物转化后所產生的有效态氮总量依次为:豆餅、花生餅、芝麻餅、青餅>棉仁餅、生菜餅、棉籽餅>熟菜餅>桕餅。

Annual rotation of a winter crop with the summer rice is a common agricultural practice in Chekiang province. The rotation system is in variant with regard to the winter crops. In order to evaluate the effect of different winter crops on the state of soil aggregation, the present study was undertaken. Four green-manuring crops including Astragalus sinicus, Medicago denticulata, Vicia faba and Pisum sativam, two winter grain crops including wheat and barley, and one oil-bearing crop, rape, were chosen for...

Annual rotation of a winter crop with the summer rice is a common agricultural practice in Chekiang province. The rotation system is in variant with regard to the winter crops. In order to evaluate the effect of different winter crops on the state of soil aggregation, the present study was undertaken. Four green-manuring crops including Astragalus sinicus, Medicago denticulata, Vicia faba and Pisum sativam, two winter grain crops including wheat and barley, and one oil-bearing crop, rape, were chosen for rotation with the summer rice in the field. The soil under experimentation has been developed under cultivation from an alluvial parent material of fine sandy loam. The field had a water-table lying at a depth of about one meter from the top of the soil throughout the year except during rice growing season. As a check for comparison, winter fallow following rice was also included among the field treatments. Experiments are continued through five consecutive crop seasons, including two in rice and three in winter crops. Among the results, the following may have practical significance in evaluating the various systems of annual rotation for rice field: 1. Among the rotating winter crops tested, Astragalus sinicus is most effective in promoting the formation of soil aggregates having 1-5 mm. in diameter which are believed to be beneficial for rice cultivation. Other leguminous crops also show their constructive effect on soil aggregates, but are by far inferior to the Astragalus. To the contrary, soils under winter grains and the rape tend to deteriorate in their aggregation. 2. Close parallel relationship is found between the soil organic matter content and the percentage content of soil aggregates having 1-5 mm. in diameter. 3. The structural units with diameters larger than 5 mm. seem to be different in nature from those aggregates having 1-5 mm. in diameter. For rice soils, such large structural units are believed to be of little practical importance in so far as their fertility status is concerned, since they are to be disintegrated during the cultivation of rice.

四、摘要本試驗的一年轮作制,包括單季水稻与下列冬作的轮栽:紫云英,苜蓿,蚕豆,豌豆,油菜,小麦及大麦。另以冬季休閑作为对照。經过三次冬作,二次水稻(夏作)的轮栽,結果显示: 1.冬季种植一年生荳科綠肥,能够增加土埌中有机質含量。其中以紫云英最佳;苜蓿,蚕豆,豌豆等次之。 2.在水稻与紫云英轮作的土埌中,直徑为1—5毫米的团粒含量有显著的增加。水田中的其他荳科綠肥,如苜蓿,蚕豆,豌豆等,也能維护土埌中的团粒構造,但其效果較差。水田中禾谷类冬作轮栽或油料作物轮栽,对于土埌中直徑为1—5毫米的团粒含量,均有破坏的影响。 3.各輪作区,凡土埌有机質含量較高的,其直徑为1—5毫米的水稳性团粒也比較多;而其他大小的構造單位,和有机質的多少无关。

A kind of degleyed swampy paddy soil has been developed during the changeof submerged paddy fields with a single crop of rice to the ordinary doublecropping system of rice and wheat in the“Lower River Basin”in North Jiang-su since the founding of new China.A series of field observations,experiments and laboratory researches re-vealed that during the development of the degleyed swampy paddy soil the ac-companying change in the soil properties underwent three stages.In the firststage a hard cloddy structure was...

A kind of degleyed swampy paddy soil has been developed during the changeof submerged paddy fields with a single crop of rice to the ordinary doublecropping system of rice and wheat in the“Lower River Basin”in North Jiang-su since the founding of new China.A series of field observations,experiments and laboratory researches re-vealed that during the development of the degleyed swampy paddy soil the ac-companying change in the soil properties underwent three stages.In the firststage a hard cloddy structure was formed in the surface soil and the availablephosphorus in the soil was strongly fixed.In the second stage the top soil be-came structureless and dispersed with high tenacity for water,being cooland too wet for winter crops to grow well.In the third stage,due to the pre-cipitation and accumulation of ferric oxide and humus,there formed a very com-pact prismatic-columnar structure below the plow layer,being liable to losewater and plant nutrients.The living roots could not extend into such hardcompacted layer to absorb nutrients for plant growth.The effective measures to ameliorate the above unfavorable conditions are asfollows:(1)Drain off the surface water,plow up the soil and dry it thoroughly inthe sun.Remoisten the soil by a quick flooding of the field in order to turn theclods into friable granules.(2)Adopt a rotation of rice-wheat-cotton to improvethe soil structure.(3)Add phosphorus fertilizer or grow rapes or green manurecrops that can vigorously absorb phosphorus from the soil.(4)Use silty rivermud as manure to change gradually the clayey properties of the soil concerned.

江苏省里下河地区在—熟沤田改稻麦两熟田的改制中发生一种脱沼泽型水稻土。一系列野外调查,田间试验和室內研究的结果示明,脱沼泽型水稻土发生过程中土壤性状的变化包括三个阶段:第一阶段中表土产生浸水不化的块状结构和土壤有效磷的强烈固定,第二阶段中亚表土变为无结构而粘滞,土性很冷而过湿,使冬作生长不良,第三阶段中耕作层下由于土体的急剧收缩和胶结而产生极紧实的棱柱状结构,漏水漏肥,作物根不能穿入土体以吸收养份。改善以上恶劣性状的有效措施是:(1)排去田面积水、耕翻土壤、在阳光中充分晒干后迅速窨水化垡以造成疏松的团粒;(2)采用稻—麦—棉轮作,加速土壤脱沼泽,以消除土壤中、后期出现的不良结构;(3)施磷肥或种吸收土中磷素能力强的麻、油莱或其它绿肥作物;(4)掺入粉砂性河泥以逐渐改变粘性土壤的质地。

 
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