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multiple crops
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  “multiple crops”译为未确定词的双语例句
     Study on the multiple crops cultivation model in two years taking watermelon and peanut as the main crops.
     两年期多熟制西瓜、花生主体栽培模式研究
短句来源
  相似匹配句对
     THE MULTIPLE-PROBE MEASURER WAS MADE IN LIVING CROPS
     作物活体多探头测量仪的研制
短句来源
     of multiple-point in living crops in field and the results is reliable.
     该机可在田间对生长状态下的农作物进行多点体内养分积累、运输、分配等测定,且结果可靠。
短句来源
     Multiple schwannomas
     多发神经鞘瘤
短句来源
     On Multiple Copyrights
     试论多重著作权
短句来源
     Polyembryony in Crops
     作物多胚现象研究综述
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  multiple crops
This technique shows great promise for producing multiple crops from one initial blade inoculum, increasing production, and simplifying the propagation of this non-fragmenting alga in land-based tank mariculture.
      
Multiple crops of microspore embryos were obtained from responsive anthers of CMS plants in anther recultures.
      
The broad host range (over 30 species in some cases) provided the possibility to control not only one species, but a complex of lepidopterous pests infesting specific or multiple crops.
      
The techniques will enable multiple crops of fingerlings over an extended spawning season, thus increasing availability -and reducing costs.
      
The model handles multiple crops from an integrated crop data base.
      
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Correlation analysis, analysis of covariance and partial regression equation analysis were used to evaluate the data obtained on 197 plots of paddy fields of maximum yield in order to clarify the yield components and the dynamic structures of rice population. The grain yields of these fields in 1978 and 1979 were all higher than 8250 kg/ha per crop. The results were summarized as follows: 1. Results obtained in both hybrids "Shan-you 2" and "Si-you 2" of the first or second crop under the multiple...

Correlation analysis, analysis of covariance and partial regression equation analysis were used to evaluate the data obtained on 197 plots of paddy fields of maximum yield in order to clarify the yield components and the dynamic structures of rice population. The grain yields of these fields in 1978 and 1979 were all higher than 8250 kg/ha per crop. The results were summarized as follows: 1. Results obtained in both hybrids "Shan-you 2" and "Si-you 2" of the first or second crop under the multiple crop system indicated that the partial correlaton between the yield and the sum total of grains and between the yield and the percentage of ripe grains was significant. The values of the partial correlaton coefficient between the sum total of grains and the percentage of ripe grains and between the sum total of grains and 1000 grain weight showed negative significance. However, positive correlations between the sum total of grains and total full-grains were highly significant. Therefore, following the increasing of the sum total of grains, both hybrids gave increased yields, although the percentage of ripe grain and the weight of grain appeared somewhat being reduced. 2. The sum total of grains depended upon the number of available panicles multiplied by the basic numbers of grains per paaicle. 3. Significant positive correlation was found between the number of existed basic seedlings and the sum total of grains. In other words, with 15-120 thousand existed basic seedlings, the more the number of basic seedlings existed, the more the effective panicles were obtained and the more the available grain numbers. 4. According to the data obtained in this study, the number of seedlings to tillers and panicles inductive to high yield strcture is in the ratio of 1:3:2. Both hybrids "Shan-you 2" and "Si-you 2" had 20 million and 31 million grainsrespectively, producing 1050 kg. per hectare per crop.

本文用相关分析、协方差分析和偏回归方程分析的方法,分析了福建水稻高产区——龙溪地区1978、1979两年杂交水稻亩产1100斤以上的197块高产田的产量构成因素和群体动态结构,结果如下: 1、汕优2号、四优2号早、晚季都表现产量与总粒数、产量与结实率的偏相关达显著水准。总粒数与结实率、总粒数与千粒重之间成极显著的负偏相关。但总粒数与总实粒数成极显著的正相关,因此,增加总粒数,即使结实率和粒重有所下降仍然增产。 2、增加总粒数是在一定穗粒数的基础上,通过增加有效穗来达到。 3、汕优2号、四优2号的有效穗与总粒数成极显著正相关,基本苗数与有效穗数的关系也非常密切,即亩基本苗在1.5—12万范围内,基本苗愈多,有效穗愈多,总粒数愈多。 4、高产田群体的动态结构是按1:3:2的苗、株、穗比例,亩产1400斤的总粒数为2900万(汕优2号)与3100万(四优2号)。

With vast territory of 9.6 million Km~2, China has agri cultural soils covering an area of 1.2×10~8 ha constituting only about 10% of its total land area. Most parts of its lands are nonagricultural soils including forest soils of 1.22×10~8 ha, grassland soils of 2.7×10~8 ha, waster land soils of 1.2×10~8 ha, desert, mountains and others of 3.28×10~8 ha. Although with so small a percentage of agricultural soils, the agricultural production of the country has continuously and steadily increased due mainly to...

With vast territory of 9.6 million Km~2, China has agri cultural soils covering an area of 1.2×10~8 ha constituting only about 10% of its total land area. Most parts of its lands are nonagricultural soils including forest soils of 1.22×10~8 ha, grassland soils of 2.7×10~8 ha, waster land soils of 1.2×10~8 ha, desert, mountains and others of 3.28×10~8 ha. Although with so small a percentage of agricultural soils, the agricultural production of the country has continuously and steadily increased due mainly to intensive forming in the country. Intensive cultivation is the traditional practice in agriculture of China. Abundant experience has been accumulated, but there also exist problems. It is suggested by the authors that for making the most of economic and ecological benefits, comprehensive management and disposal of the agricultural soils in China should be adopted in combination with the continuous raising of multiple crop index and crop yield per unit area and reclamation of the wastelands. For further illustration of the characteristics of intensive cultivation of different soils on the basis of bioclimatic conditions, properties and utilization patterns of the (?)oils, the agricultural soils of China are divided into 8 regions, i. e. latosol-lateritic red earth region, red earthyellow earth region, yellow brown earth region, cultivated fluvogenic soil-yellow loessal soilcinnamon soil-brown earth region, dark brown forest soil-planosol-black earth region, castanozem-brown pedocal-sierozem region, gray desert soil-brown desert soil region and alpine soil region. Finally, the prospectives for the development of intensive cultivation of agricultural soils in China are discussed.

本文首先说明在全国960万平方公里领域中,农田面积占1.2亿公顷仅占总土地面积10%,由于耕种集约,农业产量不断上升。林地面积占1.22亿公顷,草地面积占2.7亿公顷,荒地面积占1.2亿公顷。漠地,高山,陆地水面及零星岛屿占3.28亿公顷。集约耕作是中国的传统习惯。长期以来,中国虽然在集约耕作上积累了不少经验,但也存在不少问题。今后应特别注意对现有农耕地进行综合治理,并不断提高复种指数及单位面积产量,同时合理进行宜农荒地的开垦,以充分发挥中国农耕地的经济效益与生态效益。为了进一步说明中国农业土壤集约耕作的特点,本文将中国1.2亿公顷农田分成8个土区,并扼要阐述了各个土区的生物气候条件,土壤性质,作物复种指数及土壤利用情况等。这八个土区是:1.砖红壤、赤红壤区;2.红壤、黄壤区;3.黄棕壤区;4.潮土、黄绵土、褐土、棕壤区;5.暗棕壤、白浆土、黑土区;6.栗钙土、棕钙土区;7.灰漠土、棕漠土区;8.高山土区(高山草甸土及高山草原土)。最后文章对中国农业土壤集约耕作的发展前景进行了初步展望。

It is well known that Chinese peasants are mostly experts in the re-alm of intensive cultivation.Similarly,mechanization of tillage workis already a sign of modernization of agriculture all over the developedcountries.In contrary to these well known facts,incidental type oftillage or zero-tillage is just equally valued as an effective means ofincreasing crop yields as well as one of soil and water conservation.Interpretation of these controversed facts have long since been not ca-red by many who are interested...

It is well known that Chinese peasants are mostly experts in the re-alm of intensive cultivation.Similarly,mechanization of tillage workis already a sign of modernization of agriculture all over the developedcountries.In contrary to these well known facts,incidental type oftillage or zero-tillage is just equally valued as an effective means ofincreasing crop yields as well as one of soil and water conservation.Interpretation of these controversed facts have long since been not ca-red by many who are interested in tillage science.For solving thisdebated problem,the following suggestions may be referred to:In the first place,one must be reminded of the magnificent outlookof an immense primitive vegetation overlying athick layer of dark color-ed,moist,porous soil which had never been cultivated nor been irri-gated or fertilized.But immediately following reclamation,an uniformbut highly thinned farm crop vegetation changed the whole landscapetaking an new type of ecological circumstances which still prevail inrecent time.Intensive tillage becomes a current practice then,becauseit is a requisit for pulverizing the hard clods formed through succes-sive evaporation from the bared spots of the land surface oforiginally moist soils.It naturally follows that zero-tillage is theprincipal factor promoting the fertility of virgin soils,or in otherwords,natural soils,while intensive tillage serves only as curativemeasure to restore those deteriorated structural forms of farm soils.In the second place,one is apt to ignore the excellent infiltration ca-pability of the virgin state soil by which it can reserve every rain dropfalling on its surface without any fear of run-off loss,since the lawof soil pF-infiltration interrelationships clarifies quite well the pointthat adequate water content of soil,usually within capillarity ranges,facilitates infiltration of water,while water content falling below the capillarity limits behaves otherwise.Bearing this in mind,one wouldbe surprised to notice those unlucky happenings that cultivated soil aresubject to,namely,droughts and floods.The former is caused by fre-quently drying up of the highly eroded soil,especially during hotsummer days,since at that time,the dry state of surface soil greatlyretard infiltration of water into deeper solum,and thus compels theswiftly falling rain drops to become a powerful accelerater of soil ero-sion and runoff loss of water.Consequently,the soil turn to be lessand less drought resistant and thus,in turn,lowers air humidity tosuch extent that frequent drought results.The latter-named naturalcalamity-floods is,in fact,a by-product of severe soil erosion,name-ly,successive filling up with sedimentary materials in drainageways,canals,and river beds.Compared with soil erosion,deposition of erod-ed soil materials in a given place is accumulative,that is to say,in-finitive enlargement both in thickness and area.Trials to overcomethese soil-inducing troubles have been quite extensive and deep-in-sighted.But apparently,the accumulated effect of soil erosion or soildeposition could not be completely eliminated.Even the prevalentpractice of“incidental O-tillage”or the well developed technics of soiland water conservation could not be proved of better economic value.It is clear from the above considerations that“ecological system ofO-tillage”might turn out to be a comparatively reliable device forvirginizing those highly erodible,cultivated soil.By“ecological sys-tem of O-tillage”,we mean the co-ordination of a series of soil struc-ture stabilization technics which is derived from an imitation of thegenetical characteristics of virgin soil.Achievements so far attainedmay be briefly enumerated under the following heads:(1)succes-sive capillary water circulation;(2)successive O-tillage;(3)succes-sive multiple crop-rotation;and(4)successive“ridge and furrow cul-ture”.The varigated forms of union of these four items have been provedefficient in renewing yield records as well as economizing cultivationexpenses,and moreover,not only upland soil,but also paddy soil,canadopt this new device profitably.Outlines of this method are given inthe Chinese issue of this paper.

本文论述了导致水土流失最根本的原因,其一是土壤干燥度的大小;其二是土层厚薄和坡度大小。文中还阐明了自然免耕法的实质,就是人们试图最大限度地和最长时间地消除土体内部水热气肥运移中所产生的种种矛盾,保证土壤结构长期处于通气、透水、导温、供肥的状态,其中最关键一点是土壤结构只能在长期免耕和不断接受毛管水浸润的情况下才能保证土壤含水量、孔隙率、导温率、供养率始终稳定而适当。同时说明自然免耕的技术体系可分为四大措施:连续免耕、连续垄作、连续浸润和连续植被。最后指出,中国水土保持应考虑两条腿走路的方针:一是采用自然免耕法最经济有效地防止冲刷造成的危害:另一是建造各种农田水利和造林护岸的工程,防止生态环境进一步恶化。

 
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