搜索结果: 136-150 共查到“知识库 土壤化学”相关记录820条 . 查询时间(1.528 秒)
通过室内盆栽和大田小区试验,测定了降解菌株苍白杆菌Ochrobactrum sp.DG-S-01对高效氯氰菊酯、高效氯氟氰菊酯和氰戊菊酯在菜薹和土壤中的降解动力学的影响。结果表明,降解菌株DG-S-01可有效去除菜薹和土壤中3种供试农药的残留,且降解过程符合一级动力学模型,降解半衰期(t1/2)与未经该菌株处理的对照相比缩短1.5～53.2 h。在菜薹中,3种农药的残留量均随降解菌处理时间的延长而...
Mineralization of nitrogen from 15N labeled crop residues at varying temperature and clay content
Rice and wheat residues straw N-mineralization immobilization
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2011/2/22
A laboratory incubation experiment was carried out for 85 days to monitor the N mineralization during the decomposition of 15N labeled wheat and rice straws incorporated at 5 g kg-1 soil at varying te...
添加葡萄糖对不同肥力黑土氮素转化的影响
添加葡萄糖 肥力水平 黑土 氮素转化
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2011/6/8
氮是作物生长必需的大量营养元素，增施化学氮肥，是农业生产采取的主要增产措施之一。我国的氮肥消费已占世界总消费量的约30%，但我国农业中氮素的生产效率趋于下降，而带来的农业环境污染则趋于加重。
采用河南、安徽、湖南浓香型烟叶产区6 县耕层植烟土壤，分析了我国浓香型植烟区土壤腐殖质组成特征。结果表明：(1)我国浓香型烟区土壤腐殖质碳量平均为15.71 g/kg，胡敏酸、富里酸和胡敏素碳量分别为3.87、3.40 和8.44 g/kg， 腐殖质及各组分变异系数均较大。(2)不同类型的土壤腐殖质组成存在显著差异，腐殖质碳量由高到低依次为：水稻土>浓香型；腐殖质；组成；土壤类型；烟草红壤>褐土。...
Effects of Filter Cake Fertilization On Soil Chemical Properties and Cassava (Manihot Esculenta Crantz) Yield In Swaziland
Cassava Chemical properties Filter cake Filter mud Organic matter
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2010/11/16
A field investigation was conducted in Swaziland in 2007-2008 cropping season to determine
the effects of filter cake fertilization on soil chemical properties and cassava (Manihot esculenta Crantz) ...
以寒地粳稻松粳6号和松粳9号为试材，研究了氮素用量对寒地粳稻植株营养性氮素（AN）、功能性氮素（FN）和结构性氮素（SN）形成积累及其变化的影响。结果表明，施氮水平对两品种功能叶片和茎秆AN和SN含量影响较大，且品种间影响程度不一致; 而子粒AN和SN含量对施氮量反应不敏感。施氮量对两品种功能叶片和子粒FN含量影响较大，而对茎秆FN含量影响较小。两品种功能叶片和茎秆AN含量随着生育进程的推进呈单峰...
红枣树氮、磷、钾吸收与累积年周期变化规律
磷 钾 吸收 积累
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2012/3/26
以6年树龄红枣为试材，采用刨根、分解取样的方法，研究了年周期内各器官的生物量、氮磷钾含量和氮磷钾累积量变化动态。结果表明，红枣各器官中干物质、氮、磷、钾的积累均随生育期的推进呈增长趋势，从果实膨大期到果实成熟期均有一个急剧的上升过程。红枣树单株生物量年增加3908.5 g，氮、磷和钾年总吸收积累量分别为70.5、19.9和99.3 g。其中果实成熟期是氮磷钾素主要吸收积累期，分别占吸收总量的55....
The effect of paper mill sludge on chemical properties of acid soil
Acid soil paper mill lime sludge soil amendment
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2011/1/13
The effect of paper mill lime sludge as acid soil amendment in an experimental study was investigated. Sludge used contained 58.4% calcium carbonates plus a small amount of heavy metals. An incubation...
试验研究了基蘖肥与穗肥氮比例对双季早、晚稻产量,干物质积累量,氮素积累量和碳氮比的影响。结果表明，当总施氮量为N 225 kg/hm2时，基蘖肥与穗肥氮比例7∶3处理的产量最高，其次为6∶4、8∶2处理，均比当地习惯施肥法（10∶0）高产。同时，当基蘖肥占总施氮量60%70%时，双季早、晚稻具有较高的干物质积累量、氮素积累量、氮素当季利用率、氮素农艺效率，群体的碳氮代谢也比较协调。早稻孕穗期叶片可...
Potential and limitations of soil organic matter build-up in dry areas
Green manure soil organic matter water infiltration water stable aggregates
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2011/1/13
Semi-arid areas comprise a large portion of the world’s agricultural crop land. These areas are characterised by high temperature and low rainfall which hinders soil organic matter accumulation.
Loss on ignition: Measuring soil organic carbon in soils of the Sahel, West Africa
Loss on ignition Sahel Mali Africa carbon sequestration
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2011/1/13
Traditional methods of measuring soil organic carbon (SOC) are not adequate for accurate evaluation of C sequestration nor to meet environmental safety requirements. Methods that permit accurate asses...
为比较我国玉米生产中不同年代大面积推广的不同品种生长发育和干物质积累规律，及其对钾素的吸收和分配的变化特点，选择了上世纪50年代至今的6个玉米品种（白马牙、金皇后、中单2号、唐抗5号、农大108和郑单958）为材料，在田间相同条件下进行研究。结果表明，与早期品种相比，现代玉米品种的发育进程慢，生育期长，叶面积大，叶片衰老慢。在大喇叭口期，不同年代玉米品种的干重无显著差异; 但其后现代品种的生长速率...
Use of models in assessing the impact of cropping system, land types and suitability on land degradation in Southwestern Nigeria
Land degradation cropping system land type model suitability
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2011/1/13
Two sites (Apomu and Alabata) measuring 10 ha and representing rainforest and savannah agro-ecological zones, respectively in South Western Nigeria were chosen to evaluate the influences of cropping s...
Efficient Phosphate Solubilization by Fungal Strains Isolated from Rice-rhizosphere Soils for the Phosphorus Release
Fungi Rice-soil Acid phosphatase phosphorus insoluble phosphate
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2010/11/16
Out of 42 fungal strains, twelve efficient strains of phosphate solubilizing fungi were isolated, screened and characterized from paddy soils of southern peninsular region of Tamil Nadu, India. Minera...