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nitrogenous fertilizer
相关语句
  氮肥
     The method of fertilizer for high yield of seed manufacture is: breed:Xinjiangdaye alfalfa,basal fertilizer:the amount of nitrogenous fertilizer is 45 kg/hm2,phosphate fertilizer is 30 kg/hm2 ,potash fertilizer is 30 kg/hm2,rate of seeding is 2.25 kg/hm2,utilizes this combination,seed yield may get 545 kg/hm2·year ,and may get hay 1075 kg/hm2·year.
     北疆盐碱地苜蓿播种当年种子生产高产施肥方案为:品种-新疆大叶紫花苜蓿,基肥用量-氮肥45 kg/hm2、磷肥30 kg/hm2、钾肥30 kg/hm2,播种量-2.25 kg/hm2,此组合下,可以年产种子545 kg/hm2、干草1075 kg/hm2。
短句来源
     Improving of the Reading Technique of NH_3-CO_2-H_2O Terary System Phase-Diagram and Application in Nitrogenous Fertilizer Production
     NH_3-CO_2-H_2O三元体系相图查图方法的改进及其在氮肥生产中的应用
短句来源
     The results showed the yield before April was highest,about 60 000 kg/hm~2 with combination of density 70 000~78 000 plant/hm~2,nitrogenous fertilizer 450.80~510.40 kg/hm~2,and phosphate fertilizer 265.10~290.11 kg/hm~2.
     结果表明:在西宁冷凉地区以栽培组合密度为7.00~7.80万株/hm2,有效氮肥施肥量为450.80~510.40 kg/hm2,有效磷肥施肥量为265.10~290.11 kg/hm2处理,4月份以前生长在日光温室中的黄瓜产量最高,在60 000 kg/hm2以上。
短句来源
     The result of the tests indicates that the starch content and the commodity rate are improved by increasing the amount of nitrogenous fertilizer to 120kg/hm2 on the basis of local normal fertilizers, such as N-80 kg/hm2 and farmyard manure 104kg/hm2. Besides, the leaf area index, chlorophyll content and net assimilation rate will rise too.
     试验表明,在当地习惯施肥(N-80kg/hm2、农家肥-104kg/hm2)基础上,提高氮肥量至120kg/hm2,同时增施磷钾肥,提高了马铃薯产量、块茎淀粉含量和商品率,提高了叶绿素含量和净同化率。
短句来源
     The result of analysis of the model showed that the effect of the time of sowing(x_1) and the interaction effect of density and nitrogenous fertilizer (x_2x_2)were all statistically significant.
     两因子交互效应为:密度与氮肥互作(x_2x_3)>播期与氮肥互作(x_1x_3)>播期与密度互作(x_1x_2)。 其中,播期(x_1)密度与氮肥互作(x_2x_3)对病指的影响均达0.05显著水平。
短句来源
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  氮素肥料
     Field observation indicates that the incidence of high percentage of infectionis coincident with the excessive application of nitrogenous fertilizer.
     (三)过量的氮素肥料,與高的稻粒黑穗病感染率有密切的關係。
短句来源
  “nitrogenous fertilizer”译为未确定词的双语例句
     for the medium-yield fields, the corresponding numbers are 120 kg/hm2 of P2O5, 177. 85 - 192. 92kg/hm2 of pure nitrogenous fertilizer, and 110. 84~131. 95kg/hm2 of K2O .
     中产田在底施P_2O_5120kg/hm~2的基础上,施纯N177.85~192.92kg/hm~2,K_2O110.84~131.95kg/hm~2,其中70%底施,30%于返青至拔节期施入。
短句来源
     the amount of organic fertilizer (rapeseed meal) is 477 ̄750 kg/hm2 the amount of nitrogenous fertilizer (S-N) is 783 ̄945 kg/hm2.
     有机肥(菜籽饼)用量477~750kg/hm2; 氮化肥(S-N)用量783~945kg/hm2。
短句来源
     The best amount of fertilizer that obtained yield above 700~750 kg/667m2 is: nitrogenous fertilizer is 13.0~18.1 kg/667m2, phosphate fertilizer is 26.3~37.8 kg/667m2, Si-fertilizer is 7.7~12.0 kg/667m2. And the mathematical model between the yield and three fertilizers have been set up.
     每667m2获得700~750kg以上稻谷产量的最优施肥量相应是尿素26.3~37.8kg/66m2、过磷酸钙13.0~18.1kg/667m2和硅肥7.7~12.0kg/667m2。
短句来源
     The amount of nitrogenous fertilizer and phosphorous fertilizer is 1∶1.
     氮磷养分施入量最佳配比为1∶1.
短句来源
     Ratio of increase on crude fattiness and crude ash was the highest when applied nitrogenous fertilizer 225 kg/hm2 > 337.5 kg/hm2 respectively;
     粗脂肪含量、粗灰分含量的增长率分别以施氮225 kg/hm~2、337.5kg/hm~2时最高;
短句来源
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  nitrogenous fertilizer
Storage from October to February and level of nitrogenous fertilizer did not affect digestibility.
      
A top dressing of chemical nitrogenous fertilizer drastically suppressed the cyanobacterial nitrogenase activity (ARA) within 12 h; the magnitude of inhibition varied with respect to the cropping system.
      
Increasing rates of nitrogenous fertilizer decreased the aluminium contents in mature leaf of tea but increased the extractable soil aluminium in the 0-30 cm soil depth.
      
In the field experiment, a treatment receiving higher application of nitrogenous fertilizer to inhibit nitrogenase activity was kept as a control.
      
When the concentration of molybdenum fell below 0,05 ppm Mo sprouting occurred, the severity of which was enhanced by heavy, late side-dressings of nitrogenous fertilizer.
      
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High percentage of chlamydospore germination of Neovossia horrida (Tak.)P.& K.with abundant basidiospore production was obtained by placing moistenedspores in a Petri dish with limited supply of water,the dish-cover being inkedblue to insure a favordable light condition.Moistened spores applied on the sur-face of kernels of a growing rice head enclosed in a paraffin paper bag was alsofound to germinate by producing a very short basidium and a large number ofbasidiospores.It is,therefore,concluded that not only...

High percentage of chlamydospore germination of Neovossia horrida (Tak.)P.& K.with abundant basidiospore production was obtained by placing moistenedspores in a Petri dish with limited supply of water,the dish-cover being inkedblue to insure a favordable light condition.Moistened spores applied on the sur-face of kernels of a growing rice head enclosed in a paraffin paper bag was alsofound to germinate by producing a very short basidium and a large number ofbasidiospores.It is,therefore,concluded that not only light but also oxygen isrequired for normal germination of the spores of the rice kernel smut. Results of a series of inoculation experiments conclusively show that thefungus infects rice kernels during the milky dough stage.Basidiospore inoculationgives higher percentage of infection than chlamydospore inoculation. Field observation indicates that the incidence of high percentage of infectionis coincident with the excessive application of nitrogenous fertilizer.Fluctuationof the amount of infection from year to year is probably determined chiefly by theduration of high moisture period from heading to dough stage.There are someevidences of varietal difference in the susceptibility of rice to the kernel smut.

(一)稻粒黑穗病菌厚垣孢子的正常萌发,在外界环境條件的關係上,不僅要求一定的光照,而且需有充分的氧氣供給。至於對水分的要求,只要空氣中?窒喈敐穸?已足供萌发的需要,不一定要有水滴的經常存在。(二)接種試驗證明病原係在水稻的灌漿期侵入種实。在自然界中,這種侵染顯然是通過氣流傳播而實现的。但種子與土壤所荷带的病原菌厚垣孢子,都是侵染的來源。(三)过量的氮素肥料,與高的稻粒黑穗病感染率有密切的關係。(四)稻粒黑穗病发生程度的年份间差異可能主要是决定於抽穗至乳熟期的高濕度的持續時間。(五)初步調查的資料表示水稻品種间具有顯著的感病性差別。

The materials of present report were collected from reconnaissence soil survey of Kwangtung and Kwangsi provinces in 1958—1960. Soils investigated include yellow earths, red earths and lateritic soils. They are developed under natural vegetations of tropic monsoon forest (secondary), subtropic evergreen broadleaf forest, conifer and broadleaf mixed forest, subalpine dwarfing and bamboo ferests, confer forests of Cunninghamia lanceolata and Pinus massoniana, and grass land. A few samples of rice paddy soil were...

The materials of present report were collected from reconnaissence soil survey of Kwangtung and Kwangsi provinces in 1958—1960. Soils investigated include yellow earths, red earths and lateritic soils. They are developed under natural vegetations of tropic monsoon forest (secondary), subtropic evergreen broadleaf forest, conifer and broadleaf mixed forest, subalpine dwarfing and bamboo ferests, confer forests of Cunninghamia lanceolata and Pinus massoniana, and grass land. A few samples of rice paddy soil were also studied for comparison. Laboratory investigations invplved the determination of chemical composition of forest litters, fraction of soil humus (after Turin and Kononova), and analysis of soil exchangeable bases, active iron and alumina, etc. From the results obtained the writers come to the following conclusions: 1. The ratios of humic acid over fulvic acid under natural vegetations are usually less than 1. Fulvic acid prevails in acid soils of tropic and subtropic regions with the presence of active iron and alumina. On the contrary, intensively cukivated paddy soils of neutral to slightly alkaline reaction in the same areas, after a long-time application of lime and manures, give a humic acid over fulvic acid ratio of about 2. 2. Active soil humus, including humic and fulvic acid extractable by 0.1 N NaOH (Fraction Ⅰ), also predominates in soil organic matter. The ratio of soil humus "Fraction 1" over "Fraction Ⅱ, including humic acid and fulvic acid only soluble through repeatedly extraction by 0.1 N H_2SO_4 and NaOH", ranges from 5:1 to 10:1. 3. Soils developed under natural vegetations contain 20—35% of readily soluble humus {extractable by 0.05 N H_2SO_4) in total organic matter. Rice paddy soils in the same area usually contain readily soluble humus less than 5%. It appears that under present agricultural practices, the more active forms of soil humus undergo rapid decomposition, and the maintenance of soil fertility is largely dependded on manures and nitrogenous fertilizers. 4. Soils of the investigeted areas contain 40—50% humin (residual organic matter resistant 1.0 acid and alkaline extraction) in total organic matter. 5. Soil litters of conifer forest of Cunninghamia lanceolate contain CaO+Mg+K_2O+Na_2O up to 59.51% and SiO_2 10.57% in the ash. Litters of bamboo forest contain CaO+MgO+K_2O+ Na_2O 8.87% and SiO_2 up to 78.21% in the ash. Litters of Pine massoniana contain CaO+MgO + K_2O+Na_2O 11.18% and a very high content of A1_2O_3 (13.91%). The present data, however, give no correlation between the chemical composition of soil litter and that of soil exchangeable bases. Soils under Pine massoniana contain relatively greater amounts of exchangeable alumina (4—16 m.e./100 gm. of soil) and active iron (65—200 m.e./100 gm. of soil) in surface layer.

本文对华南地区不同植被下的土壤有机貭、土壤活性矿物貭組成及枯枝落叶层进行了研究,企图探求植被类型对于土壤腐殖貭組成以及肥力变化的影响。供試土壤包括山地草甸土、黃壤、紅壤及砖紅壤性紅壤,由不同母貭发育而成。植被类型包括常綠闊叶林、針叶闊叶混交林、高山矮林及竹林、杉木林、馬尾松灌丛、草坡等。此外,还选了三个珠江三角洲地区不同肥力的水稻土,以比較自然植被下土壤性貭和农田土壤性貭的异同。根据初步研究結果,获得下列几点认識。 1.土壤活性腐殖质的变化两广地区自然植被下的土壤,其活性腐殖貭占土壤有机貭总量的百分比显然高于农田土壤。森林及以禾本科为主的中生性草地下的土壤,表土有机貭中合有約20—35%的活性腐殖貭(为0.1 N NaOH所能提取),但是水稻土中,通常只占6%以下。这点說明了在热带和亚热带地区的生物气候条件下,一年2—3造的耕作制度,可使結构比較簡单的活性腐殖貭很快的被矿化,而土壤肥力的維持在很大程度上依賴于有机肥料和化学肥料的逐年补給。 2.土壤中胡敏酸与富里酸的比率华南自然植被下的土壤有机貭中,胡敏酸与富里酸的比率通常小于1,紅壤地区土壤中富里酸比胡敏酸高的特点,是由于富里酸能在酸性溶液中和活性R_2O_...

本文对华南地区不同植被下的土壤有机貭、土壤活性矿物貭組成及枯枝落叶层进行了研究,企图探求植被类型对于土壤腐殖貭組成以及肥力变化的影响。供試土壤包括山地草甸土、黃壤、紅壤及砖紅壤性紅壤,由不同母貭发育而成。植被类型包括常綠闊叶林、針叶闊叶混交林、高山矮林及竹林、杉木林、馬尾松灌丛、草坡等。此外,还选了三个珠江三角洲地区不同肥力的水稻土,以比較自然植被下土壤性貭和农田土壤性貭的异同。根据初步研究結果,获得下列几点认識。 1.土壤活性腐殖质的变化两广地区自然植被下的土壤,其活性腐殖貭占土壤有机貭总量的百分比显然高于农田土壤。森林及以禾本科为主的中生性草地下的土壤,表土有机貭中合有約20—35%的活性腐殖貭(为0.1 N NaOH所能提取),但是水稻土中,通常只占6%以下。这点說明了在热带和亚热带地区的生物气候条件下,一年2—3造的耕作制度,可使結构比較簡单的活性腐殖貭很快的被矿化,而土壤肥力的維持在很大程度上依賴于有机肥料和化学肥料的逐年补給。 2.土壤中胡敏酸与富里酸的比率华南自然植被下的土壤有机貭中,胡敏酸与富里酸的比率通常小于1,紅壤地区土壤中富里酸比胡敏酸高的特点,是由于富里酸能在酸性溶液中和活性R_2O_3相結合(特別是活性鉄),这項特性在邱林、科諾諾娃、波諾馬列娃等人的研究中早已証明了。珠江三角洲上的高度熟化水稻土(土壤pH7.8),由于长期施用有机肥料及石灰的影响,有机貭中胡敏酸的数量高出富里酸一倍,胡敏酸与富里酸的比率为1.95。但是在新垦的紅壤性水稻土中(土壤pH4.5),这項比率是0.39,这点也可以証明有机貭分解过程和富里酸的形成是和土壤酸度及活性鉄、鋁有关的。 3.活性铁和鋁与腐殖质組成的关系本区一般森林及草本植被下的土壤,表土活性鋁的合量通常为每百克土4—10毫克当量,活性鉄为20—100毫克当量;馬尾松灌丛下的紅壤,活性鋁的含量每百克土可达20毫克当量左右。这些土壤的盐基飽和度一般在20—30%之間,每百克土的代換性鈣通常仅在1—2毫克当量上下,但是土壤有机貭分組分析結果,第一組腐殖貭(包括活性較強的胡敏酸和富里酸)的含量远远超过了第二組腐殖貭(指由酸液和碱液反复提取以后能溶解的部分),它們的比率为5:1和10:1(只有一个例外)。这項結果說明土壤中大量活性鋁离子和鉄离子的存在,使腐殖貭的活度增強。在珠江三角洲水稻土中,第一組腐殖貭和第二組腐殖貭的比例也在这个范围內。 4.土壤腐殖貭中的不溶性殘渣(胡敏素)的含量在表土中所有供試土壤都很一致,約占土壤腐殖貭总量的40—50%上下。植被类型、海拔高度、耕作过程、成土母质等对于胡敏素的合量,均沒有明显的影响。这样在热带和亚热带土壤的腐殖貭中,似乎有一半是胡敏素,它在短期內是不能矿化的。 5.土壤腐殖貭中的碳氮比率(C/N) 森林及草本植被下的表土腐殖貭中,其C/N比率通常在10—15左右,只有馬尾松灌丛下的紅壤,C/N比率为19.6。在这个地区的水稻土中C/N比率一般为9—11。耕作縮小了C/N比率,但是自然植被下有机貭中活性腐殖貭的含量,都远远地超过农田土壤,因此,碳氮比率的縮小,很难认为土壤有机貭中氮素有效性的提高。这在国內外的研究材料中也指出过,例如合胡敏素极高的泥炭和褐煤,其C/N比率可以在10以下。 6.不同植被下殘落物的灰分組成杉木林的殘落物合有最高的基性物貭,CaO+MgO+K_2O+Na_2O的总量占灰分的59.51%;竹林和馬尾松灌丛的殘落物合基性物貭最低,前者为8.87%,后者为11.18%(都是CaO、MgO、K_2O、Na_2O的总量)。竹林殘落物的灰分中含SiO_2高达78.21%,而杉木林的殘落物灰分中含SiO_2量最低,为10.57%。馬尾松灌丛及亚热带針闊叶混交林下的殘落物灰分中含Al_2O_3高于其他植被的殘落物,为13.91%5及12.86%。其他一般的常綠闊叶林、針闊叶混交林和亚高山矮林等殘落物灰分中的基性物貭总量均在30%左右。虽然不同植被类型地表殘落物的矿貭組成有明显的差异,但就現在的初步材料,远远不足以闡明这項差异在生物物貭循环过程中的作用。这些成分上的变化,对于土壤活性矿物貭很少有直接的相关性。只有馬尾松灌丛下的紅壤,其活性鋁含量高于一般土壤,这点可能是受了殘落物貭腐解体的影响。我們初步接触了华南地区的植被类型、土壤腐殖貭組成和活性矿物貭間相互关系的問題以后,觉得波雷諾夫所启示我們的生物地球化学的研究方向,在这一地区中有許多工作可以推进。这項研究方法如果进一步地应用于农田土壤中的輪作方式及耕作措施对于土壤肥力消长关系的研究,便可以把森林和草地土壤以及农田土壤的生成发育方向做出具体的比較。此外,我們感到,尽管邱林、科諾諾娃和瓦克斯曼(Waksman,S.A.)等近三十年来在土壤有机貭的研究上做了很多工作,但是目下的有机貭分級方法应用于热带及亚热带的土壤(特别是水稻土)的适应性还值得研究。至于胡敏酸、富里酸等在土壤中与活性矿物貭的結合情况,以及各种腐殖貭物貭对于土壤肥力及植物营养上的作用,更是一个急待进一步研究的問題。

1.In the field,the prevalence and severence of the rape mosaic disease depend-ed,to a large extent,on the dispersal of the winged aphid vectors during the lateseed-bed stage and the early field planting stage.Rhopalosiphum pseudobrassicaeDavis was the principal form of aphid vectors found in the vicinity of Hang-chow.The peak of flight of its winged form(occuring from the last part ofSeptember to the last part of October)correlated closely with the extensivenessof the disease prevalence.2.New growths(during...

1.In the field,the prevalence and severence of the rape mosaic disease depend-ed,to a large extent,on the dispersal of the winged aphid vectors during the lateseed-bed stage and the early field planting stage.Rhopalosiphum pseudobrassicaeDavis was the principal form of aphid vectors found in the vicinity of Hang-chow.The peak of flight of its winged form(occuring from the last part ofSeptember to the last part of October)correlated closely with the extensivenessof the disease prevalence.2.New growths(during the late summer and early fall)from the natural-ly infected dormant root of a cruciferous weed,Rorippa montana(Wall)Smallplayed a significant part as one of the primary sources for the new infection ofthe fall-sown crucifers.Only the summer sown Brassica sinensis had so far beenidentified as the host of R.pseudobrassicae during the hot weather of middleJuly to the first part of August.However,no mosaic symptoms appeared in theseplants.The absence of diseased plant was not due to masking effect.3.Studies of several-years meteorological data revealed that rainy days inOctober,days of precipitation and relative humidity were generally the most in-fluencing factors in checking the disease.Heavy showers or rains extending longerthan 2 days had a profound depressing effect on the activity of the winged aphidsand consequently a check on disease spread.On the other hand,the occurrenceof a drought in October was closely correlated with an outbreak of the rapemosaic disease.4.Results of the preliminary control experiment with the Chinese rapevariety Ai-da-gan showed that controlling aphids with insecticides in the seed-bed,in connection with light application of liquid nitrogenous fertilizer,had abeneficial effect in reducing the disease.By surface dressing of the seed-bedwith 6% of wettable benzene hexachloride(BHC)followed by spraying the seed-lings with Rogor and a mixture of DDT and BHC 4 times,beginning from the2-leaf stage,together with three applications of liquid fertilizer reduced the dis-ease by 84% over the plot which received only one spray of DDT+BHC and twoapplications of liquid fertilizer.

油菜苗期病毒病的发生,决定于带毒有翅蚜从毒源寄主上迁入的时间与虫口数;本田期病毒病的流行为害,在很大程度上与苗床后期和本田初期有翅若蚜的长成和扩散有关。杭州地区的传毒蚜虫主要为菜缢管岈,其有翅蚜的发生及迁飞高峯期约在9月下旬至10月下旬,油菜病毒病发病率的高峯与有翅蚜发生高峯成正相关。本研究进一步证实了带病的十字花科杂蔊菜的蓿根,越夏后萌发的植株是秋菜及油菜的重要毒源之一。在7月中旬正8月上旬的炎热夏天仅看到火白菜是菜缢管蚜的寄主,但未检查到病株,另一试验火白菜感病后无隐蔽现象。杭州地区10月份的降水量、降雨天数以及相对湿度对当年病毒病流行与否影响最大,天气干旱病毒病相当严重。暴雨或连续降雨两天以上能影响有翅蚜,发生量与迁飞量显著下降,因而在一定程度上抑制了病毒病的蔓延。播种时用6%可湿性六六六粉每亩3斤撒施畦面,苗床期两片真叶开始,连续用乐果及二二三、六六六混合液治蚜4次,与加强肥水管理,效果达84.7%。

 
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