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harvesting
相关语句
  收获
     from 64.14% to 70.48% and from 37.22% to 43.55% in the four different harvesting time.
     收获时期不同, 10个品种秸秆中 NDF和 ADF含量平均值变化范围分别是 64.14%~ 70.48%和 37.22%~ 43.55%。
短句来源
     The fresh weight of plant of GaoYou 298 and GaoYou 6 were higher reached 91 000.0kg/hm2, 76 000.3 kg/hm2 respectively harvesting in waxy ripe period, the grain yield of ChunYou 30 was highest, reaching 9 230.8 kg/hm2, the crude fat content of the highest Spring-oil 6 to 8.17%.
     蜡熟期收获,高油298和高油6号的地上鲜重水平较高,分别达到91000.0kg/hm2、76000.3kg/hm2。 完熟期收获,春油30子粒产量最高,达到9230.8kg/hm2,春油6的粗脂肪含量最高,为8.17%。
短句来源
     Plant height,leaf area indexes and dry matter accumulation at harvesting time increase by 15%~39%, 58.2%~112%,and 27%~44%,respectively. Consequently,grain yield of winter wheat increases by 36%~42%.
     集雨处理的冬小麦生长得到增强,株高和叶面积指数比对照分别增加15%~39%和58.2%~112%,收获时干物质增加27%~44%,最终产量增加36%~42%。
短句来源
     61.61% and 82.58% after harvesting of wheat (milky stage of maize ).
     小麦收获后(玉米灌浆期)小麦高出82.58%,玉米高出61.61%。
短句来源
     The kolmogorov system with constant harvesting rate for preys group discussed in this paper is dxdt=x(a_0+a_1x-a_2x 2-a_3y-a_4xy)-H_0,dydt=y(bx 2-d). The sufficient conditions of nonexistence and existence of limit cycle of the system are abtained .
     研究一类食饵种群具有常数收获率的kolmogorov系统:dx/dt=x(a0 +a1x-a2x2 -a3y-a4xy)-H0,dy/dt=y(bx2 -d)得到了该系统极限环存在与不存在的充分条件。
短句来源
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  采收
     Under the condition of storage temperature at 5±1℃, the ethylene concentrations in CK treatment was 8.87,5.32, 6.22 times higher than that in the treatment of controlledatmosphere (CA)storage 2,3, and 6 days after harvesting.
     贮藏温度5±1℃,对照在采收后2,3,6d乙烯释放量分别为处理的8.87,5.32,6.22倍;
短句来源
     3.After fruit harvesting of persimmon, 100-200 mol/L Put, 50-150 mol/L Spd and 5-50 mol/L Spm could keep fruit firmness for a longer storage time for 3 days.
     3.柿果采收后用不同浓度的多胺处理,结果显示100~200μmol/L的腐胺(Put)、50~150μmol/L的亚精胺(Spd)、5~50μmol/L的精胺(Spm)浸泡处理,提高了磨盘柿采后柿果实硬度。
短句来源
     Result:The harvesting indexes from the first year to the fourth year are as follows:569,954,179,222(curing throat and eye diseases);
     结果:1~4年茎的采收指数依次清音明目为569,954,179,222;
短句来源
     7~8cm is recommanded as the best harvesting length.
     采收标准可确定为荚果长7~8cm。
短句来源
     The best cultural practice was 24 leaves,topping at early flowering stage and circular stalk barking at root base,N application rate of 12.5 kg/667m~2 and harvesting by priming,and the better was 22 leaves,topping at early flowering stage and circular stalk barking at root base,N application rate of 14kg/667m~2 and priming before stalk-cutting harvesting.
     最佳栽培技术组合为留叶24片、初花打顶根基处环剥、施氮量12.5kg/667m2、全摘叶采收,其次是留叶22片、初花打顶根基处环剥、施氮量14kg/667m2、半整株采收
短句来源
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  收割
     The directly nitrogen and phosphorus removal by P. australis harvesting only account for 2.201×10~(-5)% TN and 4.552×10~(-4)% TP of annual inflow to the wetland.
     收割芦苇去除的N、P量分别只占全年排入湿地总量的2.201×10-5%、4.552×10-4%。
短句来源
     Its performance index was comparatively tested by harvesting in the field and in the prairie. The testing results indicated that Its performance index accorded with the demands, the harvesting speed of different plant straw and forage grass was 4 -10 km/h and its output rate was 7 000 ~ 12 600 m2/h.
     对该机技术性能指标进行了田间植物秸秆和草原牧草的收割对比试验,试验结果表明:整机设计技术性 能指标符合要求,不同植物秸秆和牧草的收割作业速度4-10 km/h,生产率7 000-12 600 m2/h。
短句来源
     Then it discusses the issues on copyright, interoperation, indexing, metadata harvesting and the retieval of self-archiving literature.
     分析开放存取自存档资源的版权问题、自存档知识库的互操作问题、自存档知识库的查找问题、自存档资源的元数据收割及检索问题。
短句来源
     The intension of secateur for Nasturtium officinale has some effect on its uptake rate,thus the length of cut when harvesting should be less than 10 cm.
     西洋菜收割时的剪割强度影响其氮磷吸收速率,每次剪割长度不得超过10 cm.
短句来源
     The relations of ratooning abi lity to the yield and yield components of'the main crop (MC), to endogenesis plant hormone, activity of superoxide dismutase (SOD) and peroxidase (POD) of MC root and culm both on day 18 after heading and on day 7 after harvesting of MC were examined.
     研究了头季稻齐穗后18d、收割后7d,稻茎、根系中内源激素含量、超氧化物歧化酶(superoxide dismutase,SOD)、过氧化物酶(peroxidase,POD)活性与水稻再生特性的关系;
短句来源
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  “harvesting”译为未确定词的双语例句
     A Study on Ecologcal Operational Systems of Harvesting and Transportation of Artificial Forest in Northwest Fujian Province
     闽西北人工林生态采运作业系统研究
短句来源
     Study on Theory and Technology of Forest Ecological Harvesting Planning at Landscape Level in Northeast Over-cutting Forest Area
     东北过伐林区森林景观生态采伐规划理论与技术研究
短句来源
     Development of Forest Harvesting Technology in the World
     国外森林采伐技术的现状
短句来源
     Application of Ergonomics in Forest Harvesting
     人机工程学在森林采伐中的应用
短句来源
     THE APPLICATION OF HYDRAULIC SEINE-HAULER IN HARVESTING FISH RAISED IN LARGE AREA FRESH WATERS
     大水面淡水养鱼捕捞应用液压大拉网起网机实例
短句来源
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  harvesting
Optimal harvesting and stability for fishing models with stage structure in inshore-offshore areas
      
Optimal harvesting control problem for linear age-dependent population dynamics
      
An optimal harvesting problem for linear age-dependent population dynamics is investigated.
      
Impact of forest harvesting on river runoff in the Xiaoxing'an Mountains of China
      
The results showed that the river flow increased in the initial ten years after forest harvesting, but decreased gradually with the growth and crown closure of the Larix gmelini plantations.
      
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Results of planting large amount of slightly but evidently diseased tubers undernatural field conditions obtained by inoculation during the harvesting time of theprevious year indicate that successive underground secondary infections from plantto plant of the same hill constitute the main feature of the process of formation ofprimary foci of subsequent aerial spread of the late blight in a potato plantation Inspection at the time of emergence revealed that all the sprouts found at theperiphery of and directly...

Results of planting large amount of slightly but evidently diseased tubers undernatural field conditions obtained by inoculation during the harvesting time of theprevious year indicate that successive underground secondary infections from plantto plant of the same hill constitute the main feature of the process of formation ofprimary foci of subsequent aerial spread of the late blight in a potato plantation Inspection at the time of emergence revealed that all the sprouts found at theperiphery of and directly connected with the tuber lesions were blackened and diedunderground.Among the sprouts which were about to emerge,those standing closeto the dead sprouts were also discolored at their basal portion,while those furtherapart still entirely healthy.Dark brown extended lesions can sometimes be seen onthe stems of the weak potato seedlings,but sporangial covering was present onlyon their lower underground portions.The stem lesions did not always reach theextremity of the stem base.Even if they did,they might not be directly connectedwith the tuber lesions. Among a total of 789 hills planted with disesed tubers in Peking and Salintzein 1956,only 9 plants with stem lesions were found,of which 5 wilted and diedrapidly,1 with its lesion healed up.The remainder stayed long enough for thefungus to sporulate on their above-ground portion of the lesions and cause thefoliage infection of the same plant and adjacent plants at the onset of a favorable weather. It is believed that the significance of the weak diseased seedlings with basalstem lesions appeared early in the season consists chiefly in the capacity of givingrise to sporangia which may again infect the underground portion of the stem of ahither to healthy plant.On the stem of a larger plant,the fungous mycelium canonly exist in the cortical tissue spreading upward and downward from the infectioncourt to cause a dark brown stripe of irregular width.Stripe lesions of this typeapparently do nto impair the normal development of the plant,but their above-ground portions serve as a persistent potential source of aerial infection. Observations outlined above together with the results of an experiment ofseedling top inoculations under field conditions lead us to postutate that delayedaerial infection is due on the one hand to the fragility of the diseased seedlingsunder natural field conditions and on the other to the lack of a suitable combinationof moisture and temperature required for sporulation and infection as the springweather is characterized by very low night temperature. It is anticipated that local forcasting service may find it helpful to plant diseasedtubers in a proper field plot for the observation on the development.of the foci ofpotato late blight.

在河北省沙岭子农业試驗站和北京农業大学試驗农場1955和1956两年所进行的病薯栽培試驗,表示土中的重复侵染是中心病株形成过程的基本特征。当挖掘出土初期的病薯时,發現直接与种薯病斑相連的幼芽都在出土之前变黑死去,剛剛露土的幼芽中,靠近已死幼芽的莖基也开始部分变色,距离較远的则仍然健全。在已出土的衰弱幼苗上常常可以看到露在地面的莖基部分也显出暗褐色的病斑,但是沒有孢子囊,而該病斑的地下部分则披有一層孢子囊趺缜o斑并不全是达到莖基的終点,而达到莖基終点的,也不与种薯病斑相連接。1956年在两地播种的789穴病薯中發現了9株这种病苗,其中5株迅速萎蔫而枯死,1株發生莖斑痊愈現象。只有少数出現較晚而維持較长久的弱苗遇到适合气候时能够在地面上形成孢子囊傳染到本株或同穴中其他植株的叶片缙诓∶绲闹饕饔孟匀辉谟谛纬傻叵骆咦幽乙砸鹜ㄖ姓诔沙さ慕≈昵o基的感染。在成株莖部上病菌只能在皮层扩展引致条紋状的暗褐色病斑。这种病斑不严重影响植株的生长發育,但是在露出地面后随时可以形成孢子囊成为空中傳染的經常潜在来源。出土病苗的观察以及幼苗地上部接种試驗結果說明病害延迟流行的原因,一方面是受病的幼苗容易枯死,另一方面是在早期气...

在河北省沙岭子农业試驗站和北京农業大学試驗农場1955和1956两年所进行的病薯栽培試驗,表示土中的重复侵染是中心病株形成过程的基本特征。当挖掘出土初期的病薯时,發現直接与种薯病斑相連的幼芽都在出土之前变黑死去,剛剛露土的幼芽中,靠近已死幼芽的莖基也开始部分变色,距离較远的则仍然健全。在已出土的衰弱幼苗上常常可以看到露在地面的莖基部分也显出暗褐色的病斑,但是沒有孢子囊,而該病斑的地下部分则披有一層孢子囊趺缜o斑并不全是达到莖基的終点,而达到莖基終点的,也不与种薯病斑相連接。1956年在两地播种的789穴病薯中發現了9株这种病苗,其中5株迅速萎蔫而枯死,1株發生莖斑痊愈現象。只有少数出現較晚而維持較长久的弱苗遇到适合气候时能够在地面上形成孢子囊傳染到本株或同穴中其他植株的叶片缙诓∶绲闹饕饔孟匀辉谟谛纬傻叵骆咦幽乙砸鹜ㄖ姓诔沙さ慕≈昵o基的感染。在成株莖部上病菌只能在皮层扩展引致条紋状的暗褐色病斑。这种病斑不严重影响植株的生长發育,但是在露出地面后随时可以形成孢子囊成为空中傳染的經常潜在来源。出土病苗的观察以及幼苗地上部接种試驗結果說明病害延迟流行的原因,一方面是受病的幼苗容易枯死,另一方面是在早期气候下不能得到形成孢子和再侵染所需要的温湿度的配合。建議在各地預测站选擇适当地点播种病薯,以便观察病害中心的發展情况,作为預測預报的根据。

Experiments were carried out with more than 70 varieties and 30 cross combinationS over three years to Study the de elopment of Some characters in the tomato plant in shenyang area.The following primary conclnsions have Leen drawn: 1.Under the condition that seedlings are raised in hot bed and trans planted to the open in early May, the growth period from the time of sowing to first harvest requires about 135 days; and it can be subdivided into the following stages,namely,the gevmination stage (12.5±6.5 days),...

Experiments were carried out with more than 70 varieties and 30 cross combinationS over three years to Study the de elopment of Some characters in the tomato plant in shenyang area.The following primary conclnsions have Leen drawn: 1.Under the condition that seedlings are raised in hot bed and trans planted to the open in early May, the growth period from the time of sowing to first harvest requires about 135 days; and it can be subdivided into the following stages,namely,the gevmination stage (12.5±6.5 days), the seedling stage (29.5±5.5 days), the flower development stage (35±8 days), and the fruit development Stage including the flowering stage (58±10 days),Flower bud differentiation usually begins during the appearance of the fourth leaf.Within the growing season, the shortest growth period occurred white seed were sown in June, and under such condition the time required from seedling emergence to first harvest needs only 80 days. 2.Temperature is the main factor which influences the length of the second developmental stage, which is shorter with mean temperature above 20℃ than it is around 15℃.The main factor that influences the length of the third developmental stage is the intensity of light.The effect of other factors such as the daily mean temperature, deposition of rainfall and others within the range of seasonal variation seems to have only minor importance.With the fourth and fifth developmental stage, temperature is still the main influencing factor. 3.Earliness of maturity has been found to be dependent both upon the time of flowering and the length of fruit development period.Under ordinary cultural condition it depends more upon the length of fruit development period, while under condition unfavorable for flower bud differentiation it depends more upon the flowering time. 4.The position of the first inflorescence varies with the growth condition of seedlings, and its year-round curve (including greenhouse culture) appears to have two peaks, i.e.higher in Spring and Autumn sowing, lower in Summer and Winter Soving.This is also true with hybrid seedlings.It seems that under ordinary condition light intensity and the daily amplitude of temperature are the two main factors which affect the position of the first inflorescence. 5.No Significant correlation was found letween earliness and the position of first inflorescence.The Conventional hypothesis which postulates,the existence of this correlation calls for further consideration. 6.There is no significant correlation existing between the length of fruit development period and the size of fruit finally attained.The length of fruit development period seems to be determined mainly by the rate of development in early stage with mean temperature alove 20℃ which is found to be more rapid than that of 15℃.Fruits that have reached the size alout half of their final diameter require about 25 days for further develop ment to reach maturity under all experimental conditions.Tomato fruits reuire alout 800℃ of summation of mean daily ternperature to develop from fertilization to maturity.However, early varieties may be satisfied with temperature summation lower than this, while late varieties may require a little higher than this. 7.Continuous selection of the early ripening fruits from early maturing plants results in gradually tropping of the mean fruit weight. 8.when plants were prunned to set only with three trusses of fruits, the varietal difference expressed as average yield to the plant was found to have no significant correlation with the mean numler of fruits to the plant tut to depend mainly upon the mean frnit weight of the variety. 9.The distribution of yield within the harvesting period from June to August may roughly be expressed by a curve with only one peak.if the yield is counted by every ten days, then most varieties reach their highest yield at the third or fourth time of picking.Generally, the first three pickings have already yielded about 70—90% of their total products.Inorder to utilize the land more economically a harvesting period lasting 30—40 (lays should be considered as suitable. 10.Most F_1 hybrids are superior to the parents as regard to the earliness of maturity, proluctivity, and high yield on the early stage.Among the varieties which have been tested,"Bison","Bounty" and"podaleaskovsky" are better parents for prolucing early and productive F_1 hybrids.

本文是从1954年起到1957年三年多时间内在沈阳对总共七十多种和三十多杂交组合的番茄的一些性状的观察研究总结,初步结论有以下几点: 一、在沈阳地区春冬温床育苗的情况下番茄从播种到初次收获约需135天,其中发芽期为12.5±6.5天,幼苗期29.5±5.5天,花器发育期为35±8天,果实发育期包括开花期在内为58±10天。花芽分化开始于第四真叶出现时。在一年之中6月播种的物候期最短,从出土到初次收获仅80天。二、影响第二发育分期长短的主要因素是气温,凡是平均温度在20℃以上的都比在15℃左右的短。影响第三发育分期长短的主要因素是光照强度。在自然气候变异幅度内的温度降水量等因素虽有影响但不及光照,影响第四和第五发育分期长短的主要因素也是温度。三、花期早晚和果实发育期的长短对早熟性有大致相等的重要性。在通常温床育苗情况下受果实发育长短的影响较大,当幼苗期条件不利于花芽分化时则受花期早晚的影响较大。四、第一花序节次的高低随育苗环境条件而变。在一年中有二次高低节次变化(包括温室栽培在内),即春秋低冬夏高。杂种也表现相似的趋势。节次的高低似乎主要决定于光照强度和日温差大小。五、第一花序节次的高低和品种成熟期的早晚并无一...

本文是从1954年起到1957年三年多时间内在沈阳对总共七十多种和三十多杂交组合的番茄的一些性状的观察研究总结,初步结论有以下几点: 一、在沈阳地区春冬温床育苗的情况下番茄从播种到初次收获约需135天,其中发芽期为12.5±6.5天,幼苗期29.5±5.5天,花器发育期为35±8天,果实发育期包括开花期在内为58±10天。花芽分化开始于第四真叶出现时。在一年之中6月播种的物候期最短,从出土到初次收获仅80天。二、影响第二发育分期长短的主要因素是气温,凡是平均温度在20℃以上的都比在15℃左右的短。影响第三发育分期长短的主要因素是光照强度。在自然气候变异幅度内的温度降水量等因素虽有影响但不及光照,影响第四和第五发育分期长短的主要因素也是温度。三、花期早晚和果实发育期的长短对早熟性有大致相等的重要性。在通常温床育苗情况下受果实发育长短的影响较大,当幼苗期条件不利于花芽分化时则受花期早晚的影响较大。四、第一花序节次的高低随育苗环境条件而变。在一年中有二次高低节次变化(包括温室栽培在内),即春秋低冬夏高。杂种也表现相似的趋势。节次的高低似乎主要决定于光照强度和日温差大小。五、第一花序节次的高低和品种成熟期的早晚并无一定的相关,所以这方面的传统说法是需要修正的。六、果实发育所需时期的长短与果实最后达到的大小无明显相关。果实发育期的长短主要决定于幼果期的发育速度,而幼果期的长短主要决定于气温,平均温度在20℃以上时显著较在15℃左右时为速。果实发育所需積温约在800℃左右早熟品种较少晚熟品种较多。七、继续选择早熟单株早期果实能使平均单果重逐渐减轻。八、在控制结实花序数的情况下平均单株产量主要决定于平均单果重而与平均单株结果数无明显相关。九、从6月下旬到8月的产果期内分期产量的分布呈单峯曲綫,如以十天为一期则一般品种都在第三第四期连产量的最高峯。一般前三期的产量已达总产量的70~90%,故为有效利用土地起见番茄从开始采果起经30~40天即可拔株。十、杂种第一代在早熟性丰产性和早期产量方面一般都优于亲本品种。从利用杂种第一代获得早熟丰产系统来讲「比」「矮红金」「波逹里斯可夫」等都是较优良的亲本。

Experiments were carried out with more than 70 varieties and 30 cross combinations over three years to study the development of some characters in the tomato plant in Shenyang area.The following primary conclusions have Leen drawn. 1.Under the condition that seedlings are raised in hot bed and trans- planted to the open in early May,the growth period from the time of sowing to first harwest requires about 135 days;and it can be subdivided into the follwing stages,namelyi,the germination stage(12.5±6.5 days),the...

Experiments were carried out with more than 70 varieties and 30 cross combinations over three years to study the development of some characters in the tomato plant in Shenyang area.The following primary conclusions have Leen drawn. 1.Under the condition that seedlings are raised in hot bed and trans- planted to the open in early May,the growth period from the time of sowing to first harwest requires about 135 days;and it can be subdivided into the follwing stages,namelyi,the germination stage(12.5±6.5 days),the seedling stage(29.5±5.5 days),the flower development stage(35±8 days),and the fruit development stage including the flowering stage(58±10 days).Flower bub differentiation usually begins during the appearanue of the fourth leaf. Within the growing season,the shortest growth period occurred while seed were sown in June,and under such condition the time required from seedling (?)mer gence to first harvest needs only 80 days. 2.Temperature is the main factor which influences the length of the second developmental stage,which is shorter with mean temperature above 20℃ than it is around 15℃.The main factor that influences the length of the third developmental stage is the intensity of light.The effect of other factors such as the daily mean temperature,deposition of rainfall and others within the range of seasonal variation seems to have only minor importance.With the fourth and fifth developmental stage,temperature is still the main influencing factor. 3.Earliness of maturity has been found to be dependent Loth upon the time of flowering and the length of fruit development period.Under ordinary cultural condition it depends more upon the length of fruit development period, while under condition unfavorable for flower bud differentiation it depends more upon the flowering time. 4.The position of the first inflorescence varies with the growth condition of seedlings,and its year-round curve(including greenhouse culture)appears to have two peaks,i.e.higher in Spring and Autumn Sowing,lower in Summer and Winter Sowing.This is also true with hybrid seedlings.It seems that und- er ordinary condition light intensity and the daily amplitude of temperature are the two main factors which affect the position of the first inflorescence. 5.No significant correlation was found letween earliness and the position of first inflorescence.The Conventional hypothesis which postulates,the existe- nce of this correlation calls for further consideration. 6.There is no significant correlation existing between the length of fruit development period and the size of fruit finally attained.The length of fruit development period seems to be determined mainly by the rate of development in early stage with mean temperature above 20℃ which is found to be more rapid than that of 15℃.Fruits that have reached the size about half of their final diameter require about 25 days for further development to reach maturity under all experimental conditions.Tomato fruits require about 800℃ of summ- ation of mean daily temperature to develop from fertilization to maturity.Ho- wever,early varieties may be satisfied with temperature summation lower than this,while late varieties may require a little higher than this. 7.Continuous selection of the early ripening fruits from early maturing plants results in gradually dropping of the mean fruit weight. 8.when plants were prunned to set only with three trusses of fruits,the varietal difference expressed as average yield to the plant was found to have no significant correlation with the mean number of fruits to the plant out to dep- end mainly upon the mean fruit weight of the variety. 9.The distribution of yield within the harvesting period from June to August may roughly be expressed by a curve with only one peak.If the yield is counted by every ten days,then most varieties reach their highest yield at the third or fourth time of picking.Generally,the first three pickings have already yielded about 70—90% of their total products.lnorder to utilize the land more economically a harvesting period lasting 30—40 days should be considered as suitable. 10.Most F_1 hybrids are superior to the paxents as regard to the earliness of maturity,productivity,and high yield on the early stage.Among the varieties which have been tested,“Bison”,“Bounty”and“podaleaskovsky”axe better parents for protucing early and productive F_1 hybrids.

本文是从1954年起到1957年三年多时间内在渖阳对总共七十多品种和三十多杂交组合的番茄的一些性状的观察研究总结,初步结论有以下几点:一、在渖阳地区春冬温床育苗的情况下番茄从播种到初次收获约需135天,其中发芽期为12.5±6.5天,幼苗期29.5±5.5天,花器发育期为35±8天,果实发育斯包括开花期在内为58±10天。花芽分化开始于第四真叶出现时。在一年之中6月播种的物候期最短,从出土到初次收获仅80天。二、影响第二发育分期长短的主要因素是气温,凡是平均温度在20℃以上的都比在15℃左右的短。影响第三发育分期长短的主要因素是光照强度。在自然气候变异幅度内的温度降水量等因素虽有影响但不及光照,影响第四和第五发育分期长短的主要因素也是温度。三、花期早晚和果实发育期的长短对早熟性有大致相等的重要性。在通常温床育苗情况下受果实发育长短的影响较大,当幼苗期条件不利于花芽分化时则受花期早晚的影响较大。四、第一花序节次的高低随育苗环境条件而变。在一年中有二次高低节次变化(包括温室栽培在内)即春秋低冬夏高。杂种也表现相似的趋势。节次的高低似乎主要决定于光照强度和日温差大小。五、第一花序节次的高低和品种成熟期的早晚并无一定...

本文是从1954年起到1957年三年多时间内在渖阳对总共七十多品种和三十多杂交组合的番茄的一些性状的观察研究总结,初步结论有以下几点:一、在渖阳地区春冬温床育苗的情况下番茄从播种到初次收获约需135天,其中发芽期为12.5±6.5天,幼苗期29.5±5.5天,花器发育期为35±8天,果实发育斯包括开花期在内为58±10天。花芽分化开始于第四真叶出现时。在一年之中6月播种的物候期最短,从出土到初次收获仅80天。二、影响第二发育分期长短的主要因素是气温,凡是平均温度在20℃以上的都比在15℃左右的短。影响第三发育分期长短的主要因素是光照强度。在自然气候变异幅度内的温度降水量等因素虽有影响但不及光照,影响第四和第五发育分期长短的主要因素也是温度。三、花期早晚和果实发育期的长短对早熟性有大致相等的重要性。在通常温床育苗情况下受果实发育长短的影响较大,当幼苗期条件不利于花芽分化时则受花期早晚的影响较大。四、第一花序节次的高低随育苗环境条件而变。在一年中有二次高低节次变化(包括温室栽培在内)即春秋低冬夏高。杂种也表现相似的趋势。节次的高低似乎主要决定于光照强度和日温差大小。五、第一花序节次的高低和品种成熟期的早晚并无一定的相关,所以这方面的传统说法是需要修正的。六、果实发育所需时期的长短与果实最后达到的大小无明显相关。果实发育期的长短主要决定于幼果期的发育速度,而幼果期的长短主要决定于气温,平均温度在20℃以上时显著较在15℃左右时为速。果实发育所需积温约在800℃左右早熟品种较少晚熟品种较多。七、继续选择早熟单株早期果实能使平均单果重逐渐减轻。八、在控制结实花序数的情况下平均单株产量主要决定于平均单果重而与平均单株结果数无明显相关。九、从6月下旬到8月的产果期内分期产量的分布呈单峰曲线,如以十天为一期则一般品种都在第三第四期达产量的最高峰。一般前三期的产量已达总产量的70~90%,故为有效利用土地起见番茄从开始采果起经30~40天即可拔株。十、杂种第一代在早熟性丰产性和早期产量方面一般都优于亲本品种。从利用杂种第一代获得早熟丰产系统来讲「比(?)」「矮红金」「波达里斯可夫」等都是较优良的亲本。

 
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