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in mn deficient soil
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     The results indicated that soil N, P, K, Mn, and Zn were widely deficient.
     结果表明 ,土壤N、P、K、Mn和Zn普遍缺乏 ;
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     K is rich in the soil while N and P are deficient.
     土壤有机质,N和P严重不足,K素丰富。
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     Mn?
     Mn的分布 ,晶界高于晶内 ,但差别不大 ;
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     for the sandy loam paddy soil from Hongmiao, Zn was overabundant, Mn and Mo were deficient;
     但是齐贤黄泥土土壤缺 Zn,而 Mn、Mo偏多 ;
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     grown in a Cu-deficient soil.
     生长和Cu吸收的影响。
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Field experiment showed that Mn contents in various organs of kenaf (Hibisus canna-binus ) varied in the following sequences, lower leaf>middle leaf>upper leaf>root>skin>stalk. The absorbed Mn was mainly present in leaves before the fiber accumulation stage. After this stage, the absorbed Mn was used for the development of stem. Ultrasection revealed that Mndeficient chloroplast tended to be expended in volume and round in shape, with the increase in its strama material. The grana were disorganized...

Field experiment showed that Mn contents in various organs of kenaf (Hibisus canna-binus ) varied in the following sequences, lower leaf>middle leaf>upper leaf>root>skin>stalk. The absorbed Mn was mainly present in leaves before the fiber accumulation stage. After this stage, the absorbed Mn was used for the development of stem. Ultrasection revealed that Mndeficient chloroplast tended to be expended in volume and round in shape, with the increase in its strama material. The grana were disorganized and its thylakoid membrance was poorly developed or even absent. Application of Mn increased the chla, chlb contents, the chl a/b ratio, and the CO2 assimilation rate. It stimulated the activity of nitrate-reducing enzyme, the synthesis of protein and nucleic acid, and the uptake and utilization of nitrogen, and affected the differentiation and development of stem fiber cells. Application of Mn fertilizer ( MnSO4·H2O ) 1.0 kg per mu ( in Mn deficient soil ) increased the yield of kenaf by 28.8%.

研究结果表明,红麻(Hibisus cannabinus)各器官的含锰量是下位叶>中位叶>上位叶>麻根>麻皮>麻秆。麻株吸收的锰在形成纤维盛期前主要集中于叶部,尔后主要用于茎的发育。由超显微切片观察到,缺锰叶的叶绿体膨胀变圆,体积增大、衬质增多,各基粒排列混乱,膜系统发育不良,甚至瓦解。砂培试验中施用锰肥可增加叶片叶绿素a和b的含量及叶绿素a/b比值,可提高CO_2同化率和提高叶片硝酸还原酶的活性,促进蛋白质和核酸的生物合成及对氮的吸收和利用,还影响茎纤维细胞的分化和发育。对缺锰土壤施用锰肥(MnSO_4·H_2O)1.0kg/666m~2,可使红麻增产28.8%。

The soil Mn is reduced into Mn~(2+) in a great amount and then lenched from top-soil during rice planting in ricewheat rotation. So,the total Mn and available Mn in the alluvial paddy soil were lower than that in the original soil(alluvial soil). Under the conditions of calcareous soil, coarse texture as well as rice-wheat rotation will cause Mn-deficienty in soil. The wheat,barley, cabbage, broad bean,tobacco and lettuce are sensithive...

The soil Mn is reduced into Mn~(2+) in a great amount and then lenched from top-soil during rice planting in ricewheat rotation. So,the total Mn and available Mn in the alluvial paddy soil were lower than that in the original soil(alluvial soil). Under the conditions of calcareous soil, coarse texture as well as rice-wheat rotation will cause Mn-deficienty in soil. The wheat,barley, cabbage, broad bean,tobacco and lettuce are sensithive to Mn deficiency and the application of Mn fertilizer can increase crop yield significantly. The content of available potassium in Mn deficient soil is also quite low,the application of K and Mn combined fertilizer will have significant effect in incrasing the yield of wheat.

在水旱轮作条件下,土壤锰在植稻期间被大量还原为Mn~(21),从耕层淋失,因而冲积性水稻土全锰和有效锰低于其起源土壤(冲积土)。水旱轮作与土壤缺锰相关,但缺锰土壤必须同时具备石来性、轻质和水旱轮作的三个特征。小麦、大麦、厚皮菜、蚕豆、烟草、莴苣等对锰敏感,施锰有良好效果。缺锰土壤有效钾也较低,钾锰肥配施对小麦产量表现为正效应。

In Mn-deficient soil of rlce-wheat rotetion ln Sichuan Plain. tolerant of fifteen wheat cultivars or lines to Mn- deficient was Studied in field and pot experiment. The resuits showed that there were considerable differences in tolerance to Mn-deficient among these varieties. Most of wheat varieties were susceptive to Mn-deficient and just a few varieties had high tolerance. Among different wheat varities. variety"80-8" was the most tolerant to Mn-deficient...

In Mn-deficient soil of rlce-wheat rotetion ln Sichuan Plain. tolerant of fifteen wheat cultivars or lines to Mn- deficient was Studied in field and pot experiment. The resuits showed that there were considerable differences in tolerance to Mn-deficient among these varieties. Most of wheat varieties were susceptive to Mn-deficient and just a few varieties had high tolerance. Among different wheat varities. variety"80-8" was the most tolerant to Mn-deficient and the highest in grain yield, so it is very useful for application in Mn-deficient soils. Different wheat varieties can be screened preliminarily by pot experiment. Under Mn-deficient condition, Mn concentration of. shoot in different cultivars had no significant difference, therefore it could not be used as an index to identify tolerant ability to Mn-deficient. Being consistent with tolerant abilities, visual scores for Mn-deficient symptoms can be used as an index for preliminary screening. Relative grain yield in field experiment is a final index to distinguish different varieties in Mn tolerance. Vigorous root growth and high root-shoot ratio are very important factors for Mn-efficient varieties.

在四川平原水旱轮作的缺锰土壤上,采用田间和盆栽试验相结合的方法研究了15个不同小麦品种(品系)的耐缺锰能力。结果表明,不同小麦品种的耐缺锰能力存在很大差异。多数小麦品种对缺锰敏感,少数品种具有较强的耐性。其中,小麦品系“80-8”既具有较强的耐缺锰能力,也是供试小麦品种中产量最高的,在缺锰土壤上具有很好的推广应用价值。通过盆栽试验可对不同小麦品种进行初步筛选。在缺锰条件下,不同小麦品种间地上部锰浓度没有显著差异,不宜作为判别小麦耐缺锰能力的指标。缺锰可见症状与缺锰耐性有较好的一致性,可作为初步筛选指标。田间试验相对产量是最可靠的鉴定指标。根系发达,根冠比较高是小麦耐缺锰的一个重要因素。

 
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