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|  | | 为了更好的帮助您理解掌握查询词或其译词在地道英语中的实际用法，我们为您准备了出自英文原文的大量英语例句，供您参考。 | |
Carbon and nitrogen concentrations increased significantly with plantation age and had increased by 15.3-20.5-fold and 11.1-13.6-fold at 0-20 cm depth at the 18-year-old plantation compared with farmland soil.
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Cadmium-resistant bacteria were isolated from the farmland soil in Zhangshi Irrigation Area in Shenyang of Northeast China, an area has been polluted by heavy metals, especially cadmium, for more than 40 years.
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The concentrations of these metals were highest in the soils from the dressing plant area, and decreased in the order: farmland soil to paddy soil.
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This will help to preserve Costa Rican farmland soil as opposed to other damaging techniques.
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These bacteria were isolated from shellfish and farmland soil, respectively.
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The method was applied to real samples such as sewage, agricultural soil and Persian golf shrimp.
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Nitrous oxide evolution from agricultural soil: A regression approach
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Regression model was developed to explain the variability of N2O emission from agricultural soil using multifactorial analysis.
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Application of the ISCST3 model for predicting PCDD/F concentrations in agricultural soil in the vicinity of a MSWI plant in Chi
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The method was also used to investigate the presence of the isomers in leachates from agricultural soil.
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Proportions of macroaggregates (>amp;gt;0.3 mm) were highest in the forest and lowest in the cropland soil and ranged from 58-66% in forest, to 55% in savanna and 25-36% in cropland.
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Conversion of the tilled cereal-fallow cropland soil back to seeded grassland resulted in significantly more soil organic C in sand + OM fraction after 12 years of grass seed-down.
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Regional environmental change: special issue on "Modelling future changes in Cropland Soil Carbon in European Russia and the Ukr
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Several recent reports on cropland soil organic carbon (SOC) stock changes throughout Europe indicate a general continuing loss of SOC from these soils.
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Effect of municipal sludge on the respiratory activity of a cropland soil
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Nitrate has been recognized as the dominant mineral nitrogen form in most agricultural soils and the main nitrogen source for crops, but it is not usually the case in forest ecosystems.
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Using the method of immune serums, methane-oxidizing bacteria were detected in both forest and agricultural soils, but their populations differed significantly in both abundance and composition.
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N2O emissions related to agriculture were estimated as 0.69 Tg N yr-1 in 2004, of which 58% was released directly from N added to agricultural soils.
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Competitive adsorption of Cd, Cu, Hg and Pb by agricultural soils of the Changjiang and Zhujiang deltas in China
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In this study, the simultaneous competitive adsorption of four heavy metals (Cd, Cu, Hg, and Pb) on ten agricultural soils collected from the Changjiang and Zhujiang deltas, China was assessed.
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| | A 4-year experimental field study and soil investigations were conducted to determine the problems of lacking in phosphorus,nitrogen and organic matter in flat land,Wuwei County.The physical structure of the soil basically showed favourable characteristics except for hardening.According to the results,a 4-class fertility index is put forward regarding as a scientific basis for mapping out agricultural divisions, plunging the agriculture,forestry and animal husbandry in to rational layout,establishing higher... | | 本文经过四年的试验及多次的土壤调查,科学地总结出武威市川区土壤养分存在的问题是缺磷、少氮、有机质较缺。而物理性状(除土壤板结外)基本是良好的土壤物理构造。依理化现状和试验结果,提出农田土壤四级肥力指标。根据该论断可为武威市制定农业区划,进行农、林、牧合理布局,建设高产稳产农田的改土和培肥(特别是施用化肥)提供了科学依据. | | 文摘来源 | | The authors, regarding the four defferent soil of the farm-land in Hexi as an object of study, have expounded the relation between the amounts of microorganism in soil and the fertility, applying a comparative analytical method. The study showed that all of the eight kinds of microorganisms designed to be analysed were found in soil in Hexi areas. The soil contains ten millions to hundreds million microorganisms per gram. It has also proved that the amounts of microorganisms in the soil have close relations... | | 本文以河西走廊四种农田土壤为对象,采用对比分折方法。阐明土壤微生物的数量与肥力关系。研究表明,该地区农田土壤中微生物种类多,所测的八种微生物均有,且数量大,一克土壤中微生物有几千至几亿个;研究还表明,土壤中微生物的数量多少与有机质含量高低及土壤肥力水平有密切的关系。另一方面,由于微生物菌体含蛋白质高,富有活性物质,随着微生物的增殖,死亡与快速更新,必然对土壤有机质、土壤肥力乃至作物生长产生深刻的影响。 | | 文摘来源 | | A large number of soil fertility analysis and field trials were carried out in dif -ferent regions of China- Results confirmed that soil nitrogen fertility in 20 tested soil types is low . The crop relative yield in -N treatment is 69 % in average , of which 65 % accounts for " low nitrogen level " , 35 % for " medium level " , and none is " high " in nitrogen. Soil phosphorus fertility in these soils is medium . The crop relative yield in -P treatment is 86.4 % in average, of which 32 % accounts for " high... | | 在我国不同地区的20种土壤类型农田土壤上进行的大量田间试验和土壤测试证明,我国农田土壤氮素肥力较低,无氮区作物相对产量平均为69.0%,其中氮素肥力“低” 的占65%,“中”的占35%,没有氮素肥力“高”的土壤类型.土壤磷素肥力中等,无磷区作物相对产量平均为86.4%.其中磷素肥力“高” 的占32%,“中”的占59%,“低” 的占9%.土壤钾素肥力中上,无钾区作物相对产量平均为93.7%,其中钾素肥力“高” 的占41%.“中” 的占56%,“低”的占3%.根据土壤测试和作物相对产量,对全国20种类型农田土壤拟定了土壤养份丰缺指标. | | 文摘来源 | | | | << 更多相关文摘 |
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农田土壤
farmland soil
2008 CNKI－中国知网