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wheat
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  小麦
    BACTERIAL TRANSFORMATION OF INSOLUBLE ORGANIC AND INORGANIC PHOSPHOROUS COMPOUNDS INTO SOLUBLE PHOSPHATES IN SOILS Part Ⅱ.The Results Obtained by the Pots and Field Experiments to Test the Practical Value of Inoculating Wheat with Bacillus megath
    转化土壤中不溶性有机磷和无机磷化合物为可溶性磷酸盐的细菌 Ⅱ.接种 Bacillus megatherium var.phosphaticum Kungchuling 对小麦的盆栽结果和田间试验结果
短句来源
    THE EFFECT OF WATER STORAGE IN DEEP SOIL LAYER ON THE GROWTH AND YIELD OF WHEAT PLANT
    土壤深层储水对小麦产量效应的研究
短句来源
    STUDIES ON THE ECOLOGICAL DISTRIBUTION OF HETEROTROPHIC BACTERIA ON WHEAT ROOTS
    小麦根系异养细菌生态分布的研究
短句来源
    FEATURES OF MANGANESE ON PADDY SOIL CONDITIONS OF MANGANESE DEFICIENCY ON WHEAT
    冲积性水稻土锰素特征与小麦缺锰的土壤条件
短句来源
    The study of correlation betweem soil nutrition and wheat yield
    土壤营养物质和小麦产量关系研究
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  冬小麦
    N_2O Flux and CH_4 Uptake of Soil in Winter Wheat and Summer Maize Rotation System
    冬小麦/夏玉米轮作体系农田土壤N_2O排放和CH_4吸收特征
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    Study on the Technology of Monitoring Winter Wheat Grain Protein Contenton on Regional Scale by Remote Sensing
    区域性冬小麦籽粒蛋白含量遥感监测技术研究
短句来源
    The Effects of Sewage Water Irrigation on Winter Wheat and the Environmental Economy Analysis.
    污水灌溉对冬小麦的影响及环境经济效益分析
短句来源
    Study of the Uptake of Shallow Laying Groundwater for Winter Wheat
    冬小麦对地下水利用的研究
短句来源
    Field experiment on vertical distribution of winter wheat roots.
    冬小麦根系各种参数垂直分布实验研究
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  “wheat”译为未确定词的双语例句
    An Analysis of Effect of Yield Increase by Returning Wheat Straw to the Fields for Soil Betterment
    麦秸还田培肥土壤增产效应分析
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    Study on Fertitizer Model of Nitrogen and Phosphrous for Spring Wheat in Arid Hilly Area of South NingXia
    宁南干旱山区春小麦氮、磷施肥模式研究
短句来源
    The Use of Vegetation Index for Monitoring Drought and Winter Wheat Yield Estimation
    用植被指数监测干旱并估计冬麦产量
短句来源
    Potential Productivity of Light and Heat Resources and Its Utilization in Winter Wheat Field
    麦田潜在光热资源的生产潜力及开发利用
短句来源
    Effect of Fertilization in Different Types or Rainrall Years Upon the Productivity of Dryland Spring Wheat
    不同降水年型施肥对旱地春小麦生产力的影响初探
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  wheat
Etiolated wheat coleptiles were inhibited 100 and 40%, respectively, at 10-3 and 10-4 M.
      
The results showed that there were significantly positive linear relationships between the inhibitory rates of wheat seed germination and root elongation and the CODcr of the mother liquor scraps.
      
The toxicity of MSG wastewater to the test crops was in the order of tomato >amp;gt; Chinese cabbage >amp;gt; wheat, indicating that tomato was the most sensitive to the wastewater, and could be considered as an ideal toxic bioindicator.
      
The initial stage of amino acid metabolism was intensified in germinating wheat seeds with exogenous glutamine and proline.
      
The strain formed extracellular phenol oxidases during surface growth on a liquid medium in the presence of guayacol and copper sulfate, as well as during submerged cultivation in liquid medium containing wheat bran and sugar beet pulp.
      
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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。

Mechanical properties of soil including resistance to pressure, shearing, and deformation, internal pressure in relation to soil moisture content were studied with model experiment of paddy soils in rice stubble field and in wheat stubble field under laboratory condition. The mechanical strength of paddy soil in rice stubble field changed greatly with changing soil moisture content.This is due to a rapid development of attraction of molecular resulting from intensive shrinkage. Paddy soils in wheat...

Mechanical properties of soil including resistance to pressure, shearing, and deformation, internal pressure in relation to soil moisture content were studied with model experiment of paddy soils in rice stubble field and in wheat stubble field under laboratory condition. The mechanical strength of paddy soil in rice stubble field changed greatly with changing soil moisture content.This is due to a rapid development of attraction of molecular resulting from intensive shrinkage. Paddy soils in wheat stubble field, however, were found to show less change in this respect. When soil moisture content was high, the internal friction of clay soil approached zero. Its shearing strength was effected by soil cohesion only and its internal friction increased with the change of texture from heavy to light. When soil moisture content dropped, the internal friction of all the soils studied increased rapidly and was effected by the strength of aggregates and the degree of roughness of the shearing surfaces. When soil moisture dropped to the lower part of plasticity, fragility of soil began to occur, but a certain degree of plasticity and viscosity still remained. Fragility may occur at high content of soil moisture to soils with light texture and weak arrangement. As the change of a soil from plastic to solid is a continuous process, a larger range of soil moisture content should be allowed for the demarcation between a plastic and a solid soil. Since the internal pressure of the paddy soil in rice stubble field increased rapidly upon decrease of soil moisture content, especially so in the case of clay paddy soil. Hence, for cultivation on such soils a higher optimum soil moisture content is suggested for the main purpose of tillage and to minimize soil plasticity and viscosity. On account of this, it is necessary to have the plow to form soil blocks of smaller primary shear planes, to have a higher speed of plowing, to have the land plowed twice, first far in advance of planting and then immediately before planting, and to have a larger contact surface between soil and tire so as to increase the draft force of the tractor.

在实验室条件下,模拟稻茬和麦茬两种土壤状况,研究了抗机械强度、变形性质和内压力三者与土壤含水量的关系。稻茬田土壤抗机械强度随含水量变化的曲线的坡度很大,麦茬田则较小。前者因强烈收缩使分子引力很快发展之故。粘质土壤的内摩擦力,在含水量大时接近于零,抗剪强度只决定于内聚力,质地变轻内摩擦力微有呈现。含水量降低各种土壤内摩擦力增加快,并受土壤剪断面的粗糙度和团聚体强度所影响。土壤含水量降低到塑性下部,土壤脆性开始形成,但仍有一定的塑性和粘滞性,土壤质地变轻及垒结疏松时,土壤的脆性能够在更高的含水量范围内产生。土壤塑性体与固体的转变是渐次过渡的,所以二者的分界应是一个较大的湿度范围。稻茬田土壤含水量降低内压力增加很快,特别是粘质水稻土。所以我们认为水稻土耕作时湿度不宜过低,克服水稻土的塑性和粘滞性是耕作上的首要任务。为此,犁要能使土壤形成较小的初剪面土块,耕速要大,在播种期前先耕翻,并于播种时复耕。同时为发挥机具的曳引力,其行走部分与土壤的接触面积宜大。

In order to study the effect of the methods of application of phosphatic fertilizer on the yield of crops in dry land crop-rice rotation,pot and field experiments on various soils of different pH value and phosphorus composition were conducted.Results obtain- ed showed that the response in yield of wheat or soybean to superphosphate was much more prominent than that of rice in the acid and neutral paddy soils containing large amount of non-occluded iron phosphates.Furthermore,there was good residual effect...

In order to study the effect of the methods of application of phosphatic fertilizer on the yield of crops in dry land crop-rice rotation,pot and field experiments on various soils of different pH value and phosphorus composition were conducted.Results obtain- ed showed that the response in yield of wheat or soybean to superphosphate was much more prominent than that of rice in the acid and neutral paddy soils containing large amount of non-occluded iron phosphates.Furthermore,there was good residual effect of superphosphate on rice when the superphosphate was applied to its proceeding crops (wheat or soybean).Additional application of superphosphate to rice in the soybean-rice rotation gave no increase in its yield,whereas the supplementary supply of phosphatic fertilizer to soybean in the rotation of rice-autumn soybean gave marked increase in yield of this subsequent crop. The improvement of the nutrition status of phosphorus in soil after water-logging,as was revealed by the response in yield of crops to phosphatic fertilizer and by the change of “A” value of soil phosphorus,is practically due to the change of the status of iron phosphates in soil.Non-occluded iron phosphates,through the reduction of ferric ion to ferrous state,are converted into a more available form under water-logged condition.This reaction,however,seems to he reversible.The availability of iron phosphates was de- creasing again when the rice field was once drained off for dry farming. From the results obtained it is concluded that for the acid and neutral paddy soils containing large amount of non-occluded iron phosphates,as in cases prevailing in the red earth region in southern China,it seems to be an appropriable recommendation to apply phosphatic fertilizer to dry land crop and leave its residual effect to meet the need of rice.

盆栽试验和不同水旱输作的田间试验结果表明,在含有大量非闭蓄态磷酸铁化合物的南方酸性和中性土壤中,在同一条件下,磷肥对旱作的肥效远较对水稻显著。在输作中,磷肥的后效亦有两种情况:在旱—水(早大豆—水稻)输作中,残余在土壤中的磷素供应水平与继续施用过磷酸钙的供应水平比较,在水稻产量上几乎完全相等;但是,在水一旱(早稻—晚大豆)输作中,则继续施用过磷酸钙的,在晚大豆产量上又增加24%。磷肥对水稻和旱作的肥效有所差异的原因,主要是由于在渍水还原条件下土壤磷素向有效的方向转化所致,而其实质就是土壤中非闭蓄态的磷酸铁化合物的有效转化。这种转化过程的方向及其对磷肥后效的影响视条件而异。在旱—水输作时,施在旱作上的残余磷肥由于渍水还原条件的影响而向着有效的方向转化;在水—早输作时,则向着难效的方向转化。因此,在水旱交替的输作过程中,土壤磷素向有效的或难效的两个相反方向的转化过程,即土壤中非闭蓄态的磷酸铁化合物的活化和老化过程,可能是不断地反复地进行着的。根据上述的试验结果,对于南方合有大量非闭蓄态的磷酸铁化合物的酸性和中性水稻土的磷肥合理施用问题提出了一些参考意见。

 
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