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北方旱地
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  “北方旱地”译为未确定词的双语例句
     Research on water Balance in the Rainfed Farmland and Improvement of Crop Productivity in North China
     北方旱地农田水分平衡及提高作物生产力研究
短句来源
     Study on optimum sowing Time for High-yield Cultivation of plastic-film Corn in north China
     对北方旱地覆膜玉米高产栽培最佳播期的研究
短句来源
     Problems and Measures of Dryland Agricultre Development in the North of China
     我国北方旱地农业发展现状问题与对策
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     Progress and Consideration of Dryland Farming Research In North China
     北方旱地农业研究的进展与思考
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     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.
     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。
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  相似匹配句对
     Breeding and Cultivation Techniques of Codonopsis pilosula in Arid Land
     北方旱地党参育苗及栽培技术
短句来源
     The Nitrogen Balance of Crop Field Soil in North Area of China
     北方旱地土壤氮素平衡
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     THE STATION OF NORTH
     北方小站
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     Silent North
     无声的北方
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     Dryland Farming in India
     印度的旱地农业
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This paper analyses the great difference between thea ctual evapotranspiration and the theoretical one by means of wettness,evapotranspiration ratio,efficiency of utilization of rainfall water and the variation of values of characters of soil moisture in farmlands. The analytical results indicate that there is a positive correlation between water surface evaporation and soil evaporation as well as a negative correlation between water surface evaporation and crop evapotranspiration.Nevertheless,the theoretical...

This paper analyses the great difference between thea ctual evapotranspiration and the theoretical one by means of wettness,evapotranspiration ratio,efficiency of utilization of rainfall water and the variation of values of characters of soil moisture in farmlands. The analytical results indicate that there is a positive correlation between water surface evaporation and soil evaporation as well as a negative correlation between water surface evaporation and crop evapotranspiration.Nevertheless,the theoretical evapotranspiration mixes the both together,thus appearing to have the positive correlation plus the negative one.As a result,there occurs to have no correlation. This paper has summarized the two principal laws of soil moisture in rainfed lands in North China,i.e.water requirement by summer crops in the drought period in spring depends upon the moisture stored in soil in every other year, and the absorption of soil moisture by root systems is closely connected with rainfall water penetrating into soil i(?)he rainy season. The climatic zonification is based on the analytical equation of moisture physics, and at the same time, this paper deals with characters of each climatic zone and the developing orientation.

本文依湿润度、蒸散比、蒸发比、降水利用率等农田水分特征值的变化情况分析了实际蒸散与理论蒸散的巨大差异:水面蒸发与土壤蒸发成正相关,与作物蒸腾成反相关。理论蒸散把两者混在一起,“出现了正相关加反相关,结果变成不相关的现象”;归纳了北方旱地水分变化的两个主要规律:夏田作物春旱期需水依靠“隔年墒”和作物根系吸水深度大,同雨季入土水分保持了紧密的联系;根据国内外研究现状,用简化土壤蒸发方程处理的水分平衡产量预报方程作为区划工具,确定有作物代表性的气候指标,对我国北方的干湿气候进行了区划,分析了各气候区干旱表现形式,并对全面开发的途径进行了探讨。

As the nitrogen balance study shows, the crop field soil in Tianjin suburbs, for the most part, presents nitrogen deficiency with a balance coefficient of about 87% .whereas the vegetable soil has an excess with a balance coefficient ofabout 123% .The result of study using 15N stable tracer isotope tells us that for crop field soil, the nitrogen utilization ratio of mam crops averages 27. 04% , residue in soil is 24. 79% and deficits take 48.17% yet for vegetable soil, the nitrogen utilization ratio of main...

As the nitrogen balance study shows, the crop field soil in Tianjin suburbs, for the most part, presents nitrogen deficiency with a balance coefficient of about 87% .whereas the vegetable soil has an excess with a balance coefficient ofabout 123% .The result of study using 15N stable tracer isotope tells us that for crop field soil, the nitrogen utilization ratio of mam crops averages 27. 04% , residue in soil is 24. 79% and deficits take 48.17% yet for vegetable soil, the nitrogen utilization ratio of main vegetables averages 29.11% ,residue in soil is 22.67%. and deficits take 48. 23% . Small differences exist between those of crops and of vegetables. The main deficiency of ammonium nitrogen fertilizen applied to the crop field soil in Tianjin suburbs is due to ammonia volatility, which is mainly influenced by the factors of wind-speed, temperature, soil moisturs ' soil texture, and fertilizfr types. And the effective way of preventing ammonia from volatilization is deep placement.

北方大部分地区的旱地土壤中,农业氮素一般表现亏损,平衡强度约87%;园田土壤氮素略有盈余,平衡强度约123%.~(15)示踪研究表明,旱地土壤主要作物氮素利用率平均为27.04%,土壤残留24.79%,亏缺损失48.17%.园田主要蔬菜氮素和用率平均为29.11%,土壤残留22.67%,亏缺损失48.23%,其间差异很小.北方旱地施用铵态氮化肥主要损失是氨的挥发.影响氨挥发的因素有风速、温度、土壤水分、土壤质地、化肥品种.氮肥深施是防止氨挥发的有效方法.

The nine years'experiments on stubble mulching no-till startingfrom 1978 have proved that no-till soil has good ability to maintainsoil moisture and resist droughts,save water and improve water useefficiency because of high water holding capacity and saturated andunsaturated water conductivity.Stubble mulching no-till can improvethe physical,chemical and biological properties of soils and better soilfertility.The yield increase efficiency by inorganic N fertilizers is7-11%.The yield increase of winter wheat...

The nine years'experiments on stubble mulching no-till startingfrom 1978 have proved that no-till soil has good ability to maintainsoil moisture and resist droughts,save water and improve water useefficiency because of high water holding capacity and saturated andunsaturated water conductivity.Stubble mulching no-till can improvethe physical,chemical and biological properties of soils and better soilfertility.The yield increase efficiency by inorganic N fertilizers is7-11%.The yield increase of winter wheat and summer corn in succe-ssive no-till lands for 7 years is 8.5% and 16% higher than that inthe plowed or bare fallow lands.In addition,this technique can saveworkdays and energy.Also,it is of the comprehensive social effects ofcombination of land utilization and betterment of economics and eco-logy.This technique is one of the effective ways to solve the problemof“droughts and poor land fertility”of dryland farming in NorthChina.

从1978年开始,对秸杆覆盖免耕法经九年试验,证明免耕土壤由于持水力强,饱和及不饱和导水率高,保水力强,抗旱节水,提高了土壤水分利用率,改善了土壤的物理、化学和生物性状,培肥了土壤,无机氮肥增产效果提高了7—11%;小麦—夏玉米两季连续免耕,七年平均比翻耕或无秸杆覆盖的免耕分别增产8.5%及16.7%,此外,这项技术还省工节能,具有用养结合,经济、生态和社会综合效益,是解决北方旱地农业“旱与薄”问题的有效途径之一。

 
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